All Tools
554 free calculators, converters, checkers, and generators — no signup required.
Self-Employment Tax Estimator
Calculate your quarterly SE tax payments, deductions, and effective rate.
Compound Interest Calculator
See how your money grows with compound interest over time.
Freelance Rate Calculator
Find your ideal hourly, daily, and project rates based on your goals.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, and more.
Percentage Calculator
Find X% of Y, percentage change, and convert between markup and margin.
Age Calculator
Exact age in years/months/days, zodiac sign, generation, and birthday countdown.
Time Duration Calculator
Calculate hours between times, add/subtract duration, convert to decimal hours.
Tip Calculator
Calculate tips, split bills, and round up to a clean total.
Random Number Generator
Random integers, dice roller, coin flip, list shuffler, and UUID generator.
BMI Calculator
Calculate your Body Mass Index with imperial or metric units.
GPA Calculator
Calculate semester and cumulative GPA on a 4.0 scale.
Salary to Hourly Converter
Convert between annual salary and hourly rate with benefits calculator.
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions.
Password Generator
Generate secure passwords, passphrases, and PINs with strength analysis.
Due Date Calculator
Estimate your baby's due date, gestational age, trimester, and weekly milestones.
Calorie & TDEE Calculator
Calculate BMR, TDEE, and macro breakdown for weight loss, maintenance, or muscle gain.
Take Home Pay Calculator
Estimate your net paycheck after federal, state, Social Security, and Medicare taxes.
Mortgage Calculator
Calculate monthly payment, amortization schedule, and extra payment savings.
Auto Loan Calculator
Car payment, total cost of ownership, affordability check, and financing comparison.
Retirement Calculator
Project retirement savings, monthly income, and discover when you can retire.
Inflation Calculator
Compare purchasing power from 1920 to 2026 using historical CPI data.
Debt Payoff Calculator
Compare snowball vs avalanche strategies to pay off debt faster.
Word Counter
Count words, characters, sentences, readability score, and keyword density.
Lorem Ipsum Generator
Generate placeholder text in Classic, Hipster, Business, or Tech styles.
Bold/Italic Text Generator
Generate bold, italic, monospace, and more Unicode text for social media.
Small Text Generator
Convert text to superscript, subscript, or small caps Unicode characters.
Color Contrast Checker
Check WCAG 2.1 AA & AAA contrast ratios with color blindness simulation.
JSON Formatter & Validator
Format, minify, validate JSON with TypeScript type generation.
Regex Tester
Test patterns with real-time matching, common library, and explain mode.
Base64 Encoder & Decoder
Encode and decode Base64 with URL-safe mode and file upload.
AI Resume Scorer
Score your resume for ATS compatibility with industry-specific analysis.
Email Subject Line Tester
Score email subject lines for open rate with AI-generated alternatives.
Readability Checker
Check reading level with 5 formulas and sentence-by-sentence highlighting.
AI Business Name Generator
Generate 15 creative business names with taglines using AI.
Meta Description Generator
Generate 5 SEO-optimized meta descriptions with SERP preview.
AI Privacy Policy Generator
Generate a comprehensive privacy policy with GDPR/CCPA compliance.
AI Content & Originality Analyzer
Detect common phrases, boilerplate, and AI-generated writing patterns.
Love Calculator
Fun compatibility calculator with zodiac matching.
Meme Generator
Create popular memes with 6 templates.
QR Code Generator
Generate QR codes for URLs, text, email, WiFi, and contacts.
Color Palette Generator
Generate harmonious color palettes with export to CSS/Tailwind/JSON.
Baby Name Explorer
Browse 200+ baby names by style, origin, and meaning.
Rent vs Buy Calculator
30-year comparison with opportunity cost analysis.
Meeting Cost Calculator
Real-time meeting cost ticker with recurring cost projection.
Dog Age Calculator
Scientific dog-to-human age conversion by breed size.
Backlink Checker Guide
Learn how to check backlinks with free tools.
Domain Authority Guide
Understand domain authority and check it with free tools.
Keyword Rank Guide
Learn how to track keyword rankings.
Redirect Checker
Visualize redirect chains and learn HTTP status codes.
Robots.txt Tester
Test robots.txt rules and validate syntax.
Paycheck Calculator
Net paycheck after all deductions for all 50 states.
Income Tax Calculator
Federal and state income tax with bracket breakdown.
401(k) Calculator
Project 401(k) balance with employer match and growth chart.
Home Affordability Calculator
How much house you can afford using the 28/36 DTI rule.
Investment Calculator
Project portfolio growth with contributions and preset scenarios.
Loan Calculator
Monthly payments and amortization for any loan type.
Interest Calculator
Simple vs compound interest comparison.
Savings Calculator
Plan savings goals with monthly deposits and HYSA rates.
Car Payment Calculator
Monthly car payment with total cost of ownership.
Amortization Calculator
Full amortization schedule with extra payment savings.
Credit Card Payoff Calculator
Compare payoff strategies for credit card debt.
Sales Tax Calculator
Sales tax for all 50 US states with reverse mode.
ROI Calculator
Return on investment with multi-investment comparison.
Currency Converter
Convert between 20 major world currencies.
Margin Calculator
Gross margin %, markup %, and profit calculation.
Break-Even Calculator
Break-even units, revenue, and contribution margin.
Net Worth Calculator
Total assets minus liabilities with visual breakdown.
Stock Profit Calculator
Calculate stock trading profit/loss with commissions.
Tax Bracket Calculator
Find your 2026 tax bracket with visual breakdown.
BMR Calculator
Basal Metabolic Rate with two formulas compared.
Body Fat Calculator
Estimate body fat % using the US Navy method.
Pregnancy Calculator
Due date, milestones, and week-by-week development.
Ovulation Calculator
Predict ovulation and fertile window for 3 cycles.
Ideal Weight Calculator
Ideal weight from 4 formulas by height and frame.
Sleep Calculator
Optimal bedtime/wake time based on 90-min sleep cycles.
Macro Calculator
Daily protein, carbs, and fat for your goal.
Water Intake Calculator
Daily water intake by weight, activity, and climate.
Blood Alcohol Calculator
Estimate BAC with impairment level and time to sober.
Square Footage Calculator
Area for rectangles, circles, triangles, and L-shapes.
Paint Calculator
Gallons needed for any room with doors and windows.
Concrete Calculator
Cubic yards and bags for slabs, footings, columns.
Tile Calculator
Tiles needed with waste factor for floors and walls.
Roofing Calculator
Roof area, squares, and bundles by pitch.
Mulch Calculator
Cubic yards and bags needed for garden beds.
Gravel Calculator
Cubic yards and tons for driveways and landscaping.
Lumber Calculator
Board feet and cost estimate for lumber projects.
Wallpaper Calculator
Rolls needed with pattern repeat and waste factor.
Deck Cost Calculator
Deck costs by size, material, and labor.
Length Converter
Convert meters, feet, inches, miles, km, and more.
Weight Converter
Convert kg, lbs, ounces, grams, stones, and tons.
Temperature Converter
Convert Fahrenheit, Celsius, and Kelvin.
Volume Converter
Convert cups, tbsp, tsp, liters, ml, gallons.
Area Converter
Convert sq ft, sq m, acres, hectares.
Speed Converter
Convert mph, km/h, knots, m/s, Mach.
Energy Converter
Convert joules, calories, BTU, kWh.
Data Storage Converter
Convert bytes to TB in binary and decimal.
Pressure Converter
Convert PSI, bar, atm, Pascal, mmHg.
Fuel Economy Converter
Convert MPG, L/100km, km/L.
Grade Calculator
What grade do you need on the final?
Scientific Calculator
Full calculator with trig, log, and memory.
Standard Deviation Calculator
Mean, median, mode, variance, and std dev.
Quadratic Formula Calculator
Solve ax²+bx+c=0 with graph and steps.
Binary Calculator
Convert and calculate in binary, decimal, hex, octal.
Statistics Calculator
Count, sum, mean, median, mode, quartiles.
Significant Figures Calculator
Count and round to sig figs.
Logarithm Calculator
Calculate log base 10, e, 2, or custom.
Matrix Calculator
Add, multiply, determinant, inverse matrices.
Recipe Converter
Scale recipes with fraction support.
Cooking Measurement Converter
Convert cups, tbsp, tsp, ml, and more.
Air Fryer Calculator
Convert oven recipes to air fryer settings.
Baking Conversion Calculator
Volume to weight for 20 baking ingredients.
Meat Cooking Calculator
Cooking time and temp by meat, cut, and doneness.
Gas Mileage Calculator
Calculate MPG and fuel costs for trips.
Tire Size Calculator
Compare tire sizes and speedometer error.
Car Depreciation Calculator
10-year value curve by age and mileage.
EV Charging Cost Calculator
Charging cost and time at Level 1/2/3.
Towing Capacity Calculator
GCWR safety check for towing.
Instagram Engagement Calculator
Calculate engagement rate with benchmarks.
YouTube Money Calculator
Estimate earnings from views and CPM.
TikTok Engagement Calculator
Engagement rate and Creator Fund earnings.
Hashtag Generator
130 categorized hashtags for social media.
Social Media Image Size Guide
Dimensions for all social media platforms.
Timezone Converter
Convert time between 25 world timezones.
Flight Time Calculator
Estimated flight duration between 50 cities.
Travel Budget Calculator
Plan trip expenses for 20 destinations.
Currency Exchange Calculator
See what you get after exchange fees.
Jet Lag Calculator
Recovery time and light exposure schedule.
Child Height Predictor
Predict adult height from parents' heights.
Baby Weight Percentile
WHO growth chart percentiles by age.
Breastfeeding Calculator
Daily milk needs and feeding schedule.
Diaper Cost Calculator
Total diaper cost through potty training.
Screen Time Calculator
Compare to AAP guidelines by age.
Ohm's Law Calculator
Calculate V, I, R, P from any two values.
Electricity Cost Calculator
Monthly cost for any appliance.
Solar Panel Calculator
System size, cost, and payback period.
Carbon Footprint Calculator
Annual CO₂ from driving, flying, energy, diet.
Wind Chill Calculator
Wind chill temp and frostbite risk.
Bowling Score Calculator
Frame-by-frame scoring with strikes and spares.
Golf Handicap Calculator
USGA handicap index from recent rounds.
Poker Odds Calculator
Texas Hold'em hand odds and equity.
Batting Average Calculator
BA, OBP, SLG, and OPS calculation.
One Rep Max Calculator
1RM with Epley, Brzycki, and Lombardi.
Heart Rate Zone Calculator
5 training zones with BPM ranges.
Pace Calculator
Running pace, time, and race splits.
Cat Age Calculator
Cat years to human years (scientific formula).
Pet Food Calculator
Daily food portions for dogs and cats.
Aquarium Calculator
Tank volume, fish capacity, and heater size.
Character Counter
Characters, words, and platform limit bars.
Text Diff Checker
Compare two texts and highlight differences.
Hex to RGB Converter
Convert hex, RGB, and HSL color codes.
Markdown to HTML Converter
Convert Markdown to HTML with live preview.
Text to Binary Converter
Convert text to binary and back.
Morse Code Converter
Text to Morse code with audio playback.
Fantasy Football Trade Calculator
Evaluate trades with player value scores.
SaaS LTV Calculator
Calculate customer lifetime value from ARPU, churn rate, and gross margin.
SaaS CAC Calculator
Calculate customer acquisition cost and payback period.
SaaS MRR Calculator
Calculate monthly and annual recurring revenue across pricing tiers.
Startup Burn Rate Calculator
Calculate gross/net burn rate and months of runway remaining.
Equity Dilution Calculator
See how new shares and option pools dilute your ownership stake.
Convertible Note Calculator
Calculate conversion price, shares, and ownership from convertible notes.
Rule of 40 Calculator
Check if your SaaS company passes the Rule of 40 benchmark.
Churn Rate Calculator
Calculate customer churn rate, retention rate, and projected annual churn.
SaaS Payback Period Calculator
Calculate how many months to recover customer acquisition cost.
ARR Calculator
Calculate annual recurring revenue from MRR or individual contracts.
Cap Rate Calculator
Calculate capitalization rate for real estate investment properties.
Cash-on-Cash Return Calculator
Calculate annual cash-on-cash return on your real estate investment.
Rental Yield Calculator
Calculate gross and net rental yield on investment properties.
NOI Calculator
Calculate net operating income for commercial or rental properties.
DSCR Calculator
Calculate debt service coverage ratio for loan qualification.
GRM Calculator
Calculate gross rent multiplier to compare investment properties.
Life Insurance Needs Calculator
Calculate how much life insurance coverage your family needs.
Home Insurance Cost Estimator
Estimate homeowners insurance premiums by state and coverage level.
Disability Insurance Calculator
Calculate disability insurance coverage needs and premium estimates.
Umbrella Insurance Calculator
Calculate recommended umbrella insurance coverage based on net worth.
Capital Gains Tax Calculator
Calculate short-term and long-term capital gains tax on investments.
Estate Tax Calculator
Estimate federal estate tax liability with exemptions and deductions.
Gift Tax Calculator
Calculate gift tax with annual exclusion and lifetime exemption tracking.
AMT Calculator
Calculate Alternative Minimum Tax and compare with regular tax.
FICA Tax Calculator
Calculate Social Security and Medicare taxes for employees and self-employed.
W-4 Withholding Calculator
Calculate optimal W-4 settings to match your expected tax liability.
RMD Calculator
Calculate required minimum distributions from retirement accounts.
Roth Conversion Calculator
Compare tax impact of converting Traditional IRA to Roth IRA.
HSA Tax Savings Calculator
Calculate federal, state, and FICA tax savings from HSA contributions.
Property Tax Calculator
Calculate property taxes with millage rates, exemptions, and assessments.
Inventory Turnover Calculator
Calculate inventory turnover ratio and days to sell inventory.
Working Capital Calculator
Calculate working capital and current ratio from assets and liabilities.
Accounts Receivable Days Calculator
Calculate days sales outstanding to measure collection efficiency.
Cash Conversion Cycle Calculator
Calculate how many days it takes to convert inventory to cash.
Operating Margin Calculator
Calculate operating income and margin from revenue and expenses.
EBITDA Calculator
Calculate EBITDA and EBITDA margin from financial statements.
Gross Margin Calculator
Calculate gross profit margin and markup percentage.
Customer Acquisition Cost Calculator
Calculate CAC from marketing and sales spend.
Revenue Per Employee Calculator
Calculate revenue efficiency per employee with industry benchmarks.
Debt-to-Equity Ratio Calculator
Calculate D/E ratio to assess financial leverage and risk.
MACRS Depreciation Calculator
Calculate MACRS depreciation schedules for tax purposes.
Straight-Line Depreciation Calculator
Calculate annual depreciation using the straight-line method.
Double Declining Balance Calculator
Calculate accelerated depreciation with the DDB method.
Present Value Calculator
Calculate the present value of a future sum or annuity stream.
Future Value Calculator
Calculate future value with compound growth and periodic contributions.
IRR Calculator
Calculate internal rate of return for investment cash flows.
NPV Calculator
Calculate net present value and profitability index for investments.
WACC Calculator
Calculate weighted average cost of capital for corporate finance.
Annuity Calculator
Calculate present and future value of ordinary annuities and annuities due.
Bond Yield Calculator
Calculate current yield, yield to maturity, and total return on bonds.
eGFR Calculator
Calculate estimated glomerular filtration rate for kidney function assessment.
BSA Calculator
Calculate body surface area using Du Bois, Mosteller, and Boyd formulas.
Glasgow Coma Scale Calculator
Assess consciousness level with the GCS eye, verbal, and motor responses.
APGAR Score Calculator
Calculate newborn APGAR scores at 1 and 5 minutes after birth.
Framingham Risk Calculator
Estimate 10-year cardiovascular disease risk using the Framingham model.
VO2 Max Calculator
Estimate VO2 max from Cooper test, Rockport walk, or 1.5-mile run.
Running Pace Calculator
Calculate pace per mile/km and predict race finish times.
Body Recomposition Calculator
Plan body recomp with calorie targets to lose fat and maintain muscle.
Protein Intake Calculator
Calculate daily protein needs based on weight, activity, and fitness goals.
Hydration Calculator
Calculate daily water intake based on weight, activity, and climate.
IVF Cost Calculator
Estimate IVF treatment costs including medications, procedures, and insurance.
Fertility Window Calculator
Calculate ovulation day and fertile window based on your cycle.
Menstrual Cycle Calculator
Predict next periods, ovulation, and cycle phases for 6 months.
Pediatric Dosing Calculator
Calculate safe medication doses for children by weight.
Child BMI Calculator
Calculate BMI and CDC percentile for children ages 2-20.
IV Drip Rate Calculator
Calculate IV flow rates in mL/hr and drops/min for various drop factors.
Wells Score Calculator
Assess DVT probability using the Wells clinical prediction score.
MELD Score Calculator
Calculate MELD-Na score for liver disease severity and transplant priority.
BAC Calculator
Estimate blood alcohol concentration and time to sober.
Pregnancy Weight Gain Calculator
Calculate recommended pregnancy weight gain by trimester using IOM guidelines.
Glycemic Load Calculator
Calculate glycemic load from glycemic index and carb content.
Net Carbs Calculator
Calculate net carbs for keto and low-carb diets.
Vitamin D Calculator
Calculate daily vitamin D needs to reach optimal blood levels.
Meal Prep Calculator
Plan weekly meal prep: recipes, containers, and grocery budget.
Alcohol Calorie Calculator
Calculate calories and alcohol content in beer, wine, and cocktails.
Projectile Motion Calculator
Calculate range, max height, and flight time for projectile trajectories.
Kinetic Energy Calculator
Calculate kinetic energy and momentum from mass and velocity.
Gravitational Force Calculator
Calculate gravitational force between two masses using Newton's law.
Wave Frequency Calculator
Calculate frequency, wavelength, and wave speed relationships.
Pendulum Calculator
Calculate period and frequency of a simple pendulum.
Molar Mass Calculator
Calculate molar mass from a chemical formula.
Molarity Calculator
Calculate molarity, moles, or volume of a solution.
Dilution Calculator
Calculate dilution using C1V1 = C2V2 formula.
pH Calculator
Calculate pH, pOH, and hydrogen/hydroxide ion concentrations.
Ideal Gas Law Calculator
Solve PV=nRT for any variable with multiple unit support.
Coulomb's Law Calculator
Calculate electrostatic force between two charged particles.
Snell's Law Calculator
Calculate angle of refraction and critical angle for light.
Reynolds Number Calculator
Calculate Reynolds number to determine laminar or turbulent flow.
Gear Ratio Calculator
Calculate gear ratios for single and compound gear trains.
Torque Calculator
Calculate torque from force, distance, and angle.
Escape Velocity Calculator
Calculate escape velocity for planets, moons, and other celestial bodies.
Doppler Effect Calculator
Calculate observed frequency changes from relative motion.
Buoyancy Calculator
Calculate buoyant force and whether an object floats or sinks.
Telescope Magnification Calculator
Calculate magnification, field of view, and exit pupil for telescopes.
Orbital Period Calculator
Calculate orbital period using Kepler's third law.
Heat Transfer Calculator
Calculate heat transfer by conduction, convection, and radiation.
Pipe Flow Calculator
Calculate flow rate, velocity, and Reynolds number for pipe flow.
Water Footprint Calculator
Calculate your daily water usage from household activities.
Home Energy Audit Calculator
Estimate annual energy costs and identify savings opportunities.
Stoichiometry Calculator
Calculate moles and grams of reactants and products from balanced equations.
Bayes Theorem Calculator
Calculate posterior probability using Bayes' theorem with step-by-step.
Binomial Probability Calculator
Calculate exact and cumulative binomial probabilities.
Normal Distribution Calculator
Calculate z-scores and probabilities for normal distributions.
Confidence Interval Calculator
Calculate confidence intervals for population means.
Chi-Square Test Calculator
Perform chi-square goodness of fit and independence tests.
Triangle Calculator
Solve any triangle from sides and angles using law of sines and cosines.
Circle Calculator
Calculate radius, diameter, circumference, area, arc length, and sector area.
Pythagorean Theorem Calculator
Find any side of a right triangle using a² + b² = c².
Prime Factorization Calculator
Find prime factors, divisor count, and Euler's totient of any integer.
Combinations & Permutations Calculator
Calculate nCr and nPr with step-by-step factorial breakdowns.
Shoe Size Converter
Convert shoe sizes between US, UK, EU, and JP for men, women, and kids.
Ring Size Converter
Convert ring sizes between US, UK, EU, JP, and mm diameter.
Epoch Timestamp Converter
Convert between Unix timestamps and human-readable dates.
Number Base Converter
Convert numbers between binary, octal, decimal, hex, and any base 2-36.
Roman Numeral Converter
Convert between Roman numerals and decimal numbers (1-3999).
ETH Staking Rewards Calculator
Calculate Ethereum staking rewards with compound interest projections.
Impermanent Loss Calculator
Calculate impermanent loss for DeFi liquidity pool positions.
DCA Calculator
Compare dollar-cost averaging vs lump sum investment strategies.
Dividend Yield Calculator
Calculate dividend yield, payout ratio, and growth projections.
Options Profit Calculator
Calculate breakeven, max profit, and max loss for call and put options.
BTU Calculator
Calculate heating/cooling BTU needs and AC tonnage for any room.
Flooring Cost Calculator
Estimate flooring costs for hardwood, laminate, tile, vinyl, and carpet.
Fence Cost Calculator
Estimate fence material and installation costs by type and length.
Kitchen Remodel Cost Calculator
Estimate kitchen renovation costs with itemized breakdown by scope.
Bathroom Remodel Cost Calculator
Estimate bathroom renovation costs by size and fixture selections.
D&D Damage Calculator
Calculate average, min, and max damage with dice rolls, modifiers, and crits.
Dice Probability Calculator
Calculate the probability of rolling specific results with any dice combination.
Binge Watch Calculator
Calculate total watch time and days to finish a TV series.
Book Reading Time Calculator
Estimate how long it will take to read a book at your reading speed.
Stream Revenue Calculator
Estimate Twitch and YouTube streaming income from subs, ads, and donations.
YouTube Subscriber Growth Calculator
Project subscriber milestones based on current growth rate.
Podcast CPM Calculator
Calculate podcast advertising revenue from downloads and CPM rates.
Blog Ad Revenue Calculator
Estimate blog ad income by network and monthly pageviews.
Newsletter Revenue Calculator
Calculate newsletter income from paid subscriptions and sponsorships.
Etsy Fee Calculator
Calculate Etsy listing, transaction, and payment processing fees.
ABV Calculator
Calculate alcohol by volume from original and final gravity readings.
Coffee Brew Ratio Calculator
Calculate perfect coffee-to-water ratios for any brew method.
Pizza Dough Calculator
Calculate flour, water, salt, and yeast for any pizza style and quantity.
Turkey Cooking Time Calculator
Calculate cook time, start time, and internal temperature for turkey.
Cocktail ABV Calculator
Calculate the alcohol content of mixed drinks with dilution adjustment.
EV vs Gas Total Cost Calculator
Compare 5 and 10-year ownership costs of electric vs gas vehicles.
Lease vs Buy Car Calculator
Compare total cost of leasing vs buying a car over the same period.
Braking Distance Calculator
Calculate stopping distance based on speed, road conditions, and reaction time.
Salary Comparison by City Calculator
Compare salaries across cities adjusted for cost of living.
Job Offer Comparison Calculator
Compare total compensation packages across multiple job offers.
Dog Food Calculator
Calculate daily calorie and food needs by breed, weight, and activity level.
Fish Stocking Calculator
Calculate how many fish your aquarium can safely hold.
Final Exam Grade Calculator
Calculate the minimum exam score needed to reach your target grade.
SAT to ACT Score Converter
Convert between SAT and ACT scores with concordance tables.
Student Loan Repayment Calculator
Calculate monthly payments, total interest, and payoff date for student loans.
BPM to Delay Time Calculator
Convert BPM to delay times for whole, half, quarter, eighth, and sixteenth notes.
Frequency to Note Converter
Convert between frequencies (Hz) and musical note names with cents offset.
Audio File Size Calculator
Calculate WAV, MP3, and FLAC file sizes from duration, sample rate, and bit depth.
Chord Transposer
Transpose chord progressions to any key with support for major, minor, and 7th chords.
Metronome Subdivision Calculator
Calculate beat subdivisions and timing intervals for any tempo and time signature.
Color Space Converter
Convert colors between HEX, RGB, HSL, HSV, and CMYK with live preview.
Aspect Ratio Calculator
Calculate and simplify aspect ratios, find dimensions from a given ratio.
PPI/DPI Calculator
Calculate pixels per inch from screen dimensions and resolution.
Clothing Size Converter
Convert clothing sizes between US, UK, EU, and AU for men and women.
Paper Size Converter
View paper dimensions for A-series, B-series, Letter, Legal, and custom sizes.
Water Heater Size Calculator
Calculate the right water heater size for your household.
Generator Size Calculator
Calculate generator wattage needed to power your essential appliances.
Insulation R-Value Calculator
Find recommended insulation R-values by climate zone and building area.
Pool Volume Calculator
Calculate pool water volume in gallons and liters for any shape.
Moving Cost Calculator
Estimate local and long-distance moving costs by home size.
Crypto Mining Profitability Calculator
Calculate mining revenue, electricity costs, and net profit.
Crypto Tax Calculator
Calculate capital gains tax on cryptocurrency trades with FIFO and LIFO.
Forex Pip Value Calculator
Calculate pip value for any currency pair and lot size.
Forex Position Size Calculator
Calculate optimal position size based on account risk and stop loss.
Sharpe Ratio Calculator
Calculate the Sharpe ratio to measure risk-adjusted investment returns.
Cat Food Calculator
Calculate daily calorie and food needs for cats by weight, age, and activity.
Chicken Coop Size Calculator
Calculate coop size, nesting boxes, and roost space for your flock.
Sourdough Starter Calculator
Calculate feeding ratios and levain builds for sourdough baking.
Commission Calculator
Calculate sales commissions with flat, tiered, and sliding scale structures.
Overtime Pay Calculator
Calculate regular, overtime, and total gross pay with projections.
Spring Constant Calculator
Calculate spring constant, force, or displacement using Hooke's Law.
Centripetal Force Calculator
Calculate centripetal force, acceleration, and period of circular motion.
Momentum Calculator
Calculate momentum, impulse, and collision outcomes.
Lens Equation Calculator
Calculate focal length, image distance, and magnification for lenses.
Work and Power Calculator
Calculate work in joules and power in watts from force and distance.
Slope Calculator
Calculate slope, y-intercept, distance, and midpoint between two points.
Matrix Determinant Calculator
Calculate the determinant of 2x2 and 3x3 matrices with steps.
Correlation Coefficient Calculator
Calculate Pearson r, R-squared, and regression line from data pairs.
Expected Value Calculator
Calculate expected value, variance, and standard deviation of outcomes.
GCD & LCM Calculator
Find greatest common divisor and least common multiple with steps.
JSON to YAML Converter
Convert between JSON and YAML formats with real-time preview.
CSV to JSON Converter
Convert CSV data to JSON array of objects with header detection.
URL Encoder/Decoder
Encode and decode URL components, full URLs, and base64.
Unix Permissions Calculator
Convert between symbolic and octal Unix file permissions.
Cron Expression Generator
Build and parse cron expressions with next run time preview.
High Altitude Baking Calculator
Adjust baking recipes for high altitude with sugar, liquid, and temp changes.
Bread Hydration Calculator
Calculate dough hydration percentage for different bread styles.
BBQ Cook Time Calculator
Calculate smoking and grilling times by meat type, weight, and temperature.
Party Food Calculator
Calculate food and drink quantities for any party size.
Wine Serving Calculator
Calculate bottles of wine needed for any event with cost estimates.
Baseball ERA Calculator
Calculate earned run average with pitcher performance ratings.
Basketball Stats Calculator
Calculate shooting percentages, PER, and efficiency rating.
Running Split Calculator
Calculate even and negative splits for any race distance.
Tip & Bill Split Calculator
Split bills with tip by equal shares or individual items.
International Tipping Guide
Find tipping customs and calculate tips for 20+ countries.
Wire Size Calculator
Calculate correct wire gauge for amps, distance, and voltage drop.
LED Savings Calculator
Calculate energy and cost savings from switching to LED bulbs.
Ceiling Fan Size Calculator
Find the right ceiling fan blade span for your room size.
Septic Tank Size Calculator
Calculate septic tank size and drain field area by bedrooms.
Patio Cost Calculator
Estimate patio material and labor costs for concrete, pavers, or stone.
Cumulative GPA Calculator
Calculate cumulative GPA across multiple semesters.
Weighted GPA Calculator
Calculate weighted GPA with honors and AP course bonuses.
Scholarship Gap Calculator
Calculate college cost gap after scholarships and financial aid.
Raise Calculator
Calculate new salary after a raise with monthly and after-tax impact.
Remote Work Savings Calculator
Calculate monthly and annual savings from working remotely.
Puppy Weight Predictor
Estimate your puppy's adult weight based on breed size and current weight.
Dog Medication Dosage Calculator
Calculate safe OTC medication doses for dogs by weight.
Aquarium Heater Calculator
Calculate heater wattage needed for your aquarium size and temperature.
Daycare Cost Calculator
Estimate childcare costs by type, age, and location.
College Savings Calculator
Calculate monthly savings needed for your child's college fund.
Name Combiner
Create fun portmanteau names by combining two names.
Random Color Generator
Generate random colors, palettes, and color schemes with HEX and RGB.
Countdown Timer Calculator
Calculate days, hours, and minutes until any target date.
Screen Break Calculator
Calculate break schedules using 20-20-20 or Pomodoro methods.
Lucky Number Generator
Generate lucky numbers and life path number from your birthdate.
CD Ladder Calculator
Build a CD ladder with staggered maturity dates and returns.
DRIP Calculator
Calculate dividend reinvestment growth over time.
Emergency Fund Calculator
Calculate how much emergency savings you need and monthly savings to get there.
Cost of Living Calculator
Compare cost of living and equivalent salary between cities.
Wealth Percentile Calculator
See how your net worth compares to others in your age group.
Pixel to Em/Rem Converter
Convert between px, em, rem, pt, and percentage units.
HTML Entity Encoder/Decoder
Encode and decode HTML entities and special characters.
JWT Decoder
Decode JWT tokens to view header and payload with expiration times.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.
Business Days Calculator
Calculate business days between dates or add business days to a date.
Waist-to-Hip Ratio Calculator
Calculate WHR and assess health risk using WHO guidelines.
Lean Body Mass Calculator
Calculate lean body mass and fat mass from weight and body fat percentage.
Caffeine Half-Life Calculator
Track caffeine levels in your body and estimate when you'll be caffeine-free.
Steps to Distance Calculator
Convert step count to distance walked with calorie burn estimate.
Target Heart Rate Calculator
Calculate heart rate training zones using Karvonen method.
Closing Cost Calculator
Estimate home purchase closing costs with itemized breakdown.
Mortgage Refinance Calculator
Calculate savings and breakeven from refinancing your mortgage.
HELOC Calculator
Calculate available home equity and HELOC payment estimates.
House Flipping Calculator
Calculate profit, ROI, and margins for fix-and-flip projects.
Rental Property ROI Calculator
Calculate cash flow, cash-on-cash return, and cap rate for rentals.
Twitter/X Engagement Calculator
Calculate engagement rate and per-follower metrics for Twitter/X.
LinkedIn Engagement Calculator
Calculate LinkedIn post engagement rate with industry benchmarks.
CPM Calculator
Calculate cost per thousand impressions for advertising campaigns.
CPC Calculator
Calculate cost per click, CTR, and cost per acquisition.
ROAS Calculator
Calculate return on ad spend and advertising profitability.
Packing List Generator
Generate a customized packing list by destination, duration, and activities.
Time Zone Meeting Planner
Find overlapping business hours across multiple time zones.
Date Calculator
Add days to dates, find days between dates, and calculate business days.
Electricity Usage Calculator
Calculate electricity cost for any appliance by wattage and usage.
Rain Barrel Calculator
Calculate rainwater collection potential from your roof area.
Friction Calculator
Calculate friction force on flat and inclined surfaces.
Density Calculator
Calculate density, mass, or volume with common material presets.
Half-Life Calculator
Calculate radioactive decay, remaining amount, and time elapsed.
Ohm's Law Wheel Calculator
Calculate any electrical value from two known values using the full Ohm's wheel.
Specific Heat Calculator
Calculate heat energy using Q=mcΔT with common substance presets.
Cake Serving Calculator
Calculate cake servings by shape, size, and serving style.
Rice-to-Water Ratio Calculator
Find perfect water ratios for any rice type and cooking method.
Butter Measurement Converter
Convert between sticks, cups, tablespoons, grams, and ounces of butter.
Smoking Time Calculator
Calculate smoke times and target temps for brisket, pork, ribs, and more.
Yeast Conversion Calculator
Convert between active dry, instant, fresh yeast, and sourdough starter.
SAFE Note Calculator
Calculate SAFE note conversion price, shares, and ownership at next round.
Vesting Schedule Calculator
Calculate equity vesting with cliff and monthly vesting timeline.
Startup Valuation Calculator
Estimate startup valuation using revenue multiples by industry.
SaaS Quick Ratio Calculator
Calculate SaaS quick ratio to measure revenue growth efficiency.
Unit Economics Calculator
Calculate contribution margin, LTV:CAC ratio, and breakeven units.
Oil Change Calculator
Calculate next oil change date and mileage by oil type.
Tire Pressure Temperature Calculator
Calculate tire pressure changes due to temperature fluctuation.
Quarter Mile Calculator
Estimate quarter-mile ET and trap speed from HP and weight.
Soccer Stats Calculator
Calculate per-90 stats, shooting accuracy, and pass completion.
Cycling Power Zone Calculator
Calculate FTP-based power zones and watts per kilogram.
UUID/ULID Generator
Generate UUID v4, UUID v7, ULID, and nanoid identifiers.
Color Blindness Simulator
Simulate how colors appear with different types of color vision deficiency.
Word Frequency Counter
Analyze text for word count, frequency, reading level, and stats.
Image Aspect Ratio Calculator
Calculate resize dimensions while maintaining aspect ratio.
Typing Speed Test
Test your typing speed in WPM with accuracy tracking.
Wire Gauge Converter
Convert between AWG, mm², and mm diameter with resistance values.
Flow Rate Converter
Convert between GPM, LPM, m³/h, CFM, and L/s.
Torque Unit Converter
Convert between N·m, ft·lb, in·lb, kg·cm, and dyne·cm.
Angle Converter
Convert between degrees, radians, gradians, and arc minutes/seconds.
Frequency Converter
Convert between Hz, kHz, MHz, GHz, RPM, and rad/s.
D&D Encounter Difficulty Calculator
Calculate encounter difficulty by party level and monster CR.
D&D Ability Score Calculator
Generate ability scores using standard array, point buy, or 4d6 drop lowest.
Gacha Probability Calculator
Calculate drop rates and expected pulls for gacha and loot box systems.
Gaming FPS Estimator
Estimate FPS by GPU, resolution, and game settings.
XP Grind Time Calculator
Calculate how long it takes to reach a target level from current XP.
Sod Calculator
Calculate sod needed for your lawn with pallet counts and cost estimate.
Fertilizer Calculator
Calculate fertilizer application rates from N-P-K ratios and lawn size.
Drywall Calculator
Calculate sheets, tape, mud, and screws needed for any room.
Staircase Calculator
Calculate risers, treads, and stringer length to building code.
Retaining Wall Calculator
Calculate blocks, gravel, and drainage for retaining walls.
Blood Pressure Calculator
Average multiple BP readings and assess category per AHA guidelines.
Creatinine Clearance Calculator
Calculate CrCl using Cockcroft-Gault equation for kidney function.
Corrected Calcium Calculator
Calculate albumin-corrected calcium levels.
Anion Gap Calculator
Calculate serum anion gap with albumin correction.
AHI Score Calculator
Calculate Apnea-Hypopnea Index for sleep apnea severity.
Rule of 72 Calculator
Calculate years to double your money or required interest rate.
Required Rate of Return Calculator
Calculate the annual return needed to reach your financial goal.
Real Return Calculator
Calculate inflation-adjusted real investment returns.
Tax-Equivalent Yield Calculator
Compare municipal bond yields to taxable bond yields.
Social Security Benefits Calculator
Estimate Social Security benefits at ages 62, 67, and 70.
Photo Print Size Calculator
Calculate maximum print size and quality from image resolution.
Font Size Converter
Convert between px, pt, em, rem, and percentage font units.
CSS Gradient Generator
Create linear and radial CSS gradients with live preview.
WCAG Contrast Ratio Calculator
Check color contrast ratios against WCAG AA and AAA standards.
Golden Ratio Calculator
Calculate golden ratio proportions for design, typography, and layout.
Baby Milestone Tracker
Track developmental milestones by age with expected timeline.
Formula Feeding Calculator
Calculate formula amounts and feeding frequency by age and weight.
Potty Training Readiness Calculator
Assess potty training readiness with a checklist of developmental signs.
Baby Sleep Schedule Calculator
Generate age-appropriate sleep schedules with nap and wake windows.
Child Growth Chart Calculator
Plot weight, height, and head circumference against WHO growth standards.
Amazon FBA Calculator
Calculate Amazon seller fees, FBA costs, and profit margins.
Shopify Profit Calculator
Calculate per-order profit and monthly break-even for Shopify stores.
eBay Fee Calculator
Calculate eBay insertion, final value, and promoted listing fees.
Markup & Margin Calculator
Convert between markup percentage and profit margin with per-unit profit.
PayPal Fee Calculator
Calculate PayPal transaction fees for domestic and international payments.
Luggage Weight Calculator
Estimate luggage weight and compare to airline limits.
Road Trip Cost Calculator
Calculate fuel, tolls, hotel, and per-person costs for road trips.
Hotel Cost Comparison Calculator
Compare total hotel costs including taxes, resort fees, and parking.
Vacation Savings Calculator
Calculate monthly savings needed to fund your next vacation.
Passport Expiration Calculator
Check if your passport meets the 6-month validity rule for travel.
Electricity Bill Calculator
Estimate your electricity bill from kWh usage and rate.
Paint Color Mixer
Mix colors by ratio and preview the resulting blend.
Internet Speed Calculator
Calculate download times and check if your speed is enough for streaming.
Sleep Debt Calculator
Track weekly sleep debt and plan a catch-up schedule.
Sun Exposure Calculator
Calculate safe sun exposure time by skin type, UV index, and SPF.
FIRE Number Calculator
Calculate your Financial Independence number and years to early retirement.
Rent Affordability Calculator
Calculate maximum rent using the 30% rule and 50/30/20 budget.
Debt Payoff Date Calculator
Calculate payoff date and total interest from monthly payments.
Savings Goal Calculator
Calculate monthly savings needed to reach a financial goal.
Income to Hourly Rate Calculator
Convert annual, monthly, or weekly income to hourly rate.
Boyle's Law Calculator
Calculate pressure or volume changes using P1V1=P2V2.
Charles's Law Calculator
Calculate volume or temperature changes using V1/T1=V2/T2.
Nernst Equation Calculator
Calculate cell potential under non-standard conditions.
Radioactive Decay Calculator
Calculate remaining radioactive material from decay constant and time.
Fluid Pressure Calculator
Calculate hydrostatic pressure at depth with multiple units.
Lawn Seeding Calculator
Calculate seed amounts by grass type for new lawns or overseeding.
Crown Molding Calculator
Calculate linear feet, miter angles, and cost for crown molding.
Window Replacement Cost Calculator
Estimate window replacement costs by type, frame, and quantity.
AC Tonnage Calculator
Calculate the right AC size in tons for your home.
Gutter Calculator
Calculate gutter materials and cost by roof perimeter.
SOL Staking Rewards Calculator
Calculate Solana staking rewards with compound projections.
Bitcoin Halving Calculator
Track blocks until the next Bitcoin halving with history.
Crypto Portfolio Calculator
Calculate portfolio value and allocation across cryptocurrencies.
Covered Call Calculator
Calculate premium income and annualized yield for covered calls.
Risk-Reward Ratio Calculator
Calculate R:R ratio and position size from entry and stop loss.
ASCII Art Text Generator
Convert text to ASCII art in multiple font styles.
Whitespace Remover
Clean up extra spaces, blank lines, and trailing whitespace.
Hex Color Picker
Pick colors and get HEX, RGB, HSL with complementary palettes.
Markdown Table Generator
Generate markdown tables with custom rows, columns, and alignment.
Lorem Ipsum Paragraph Generator
Generate customizable lorem ipsum placeholder text.
Sphere Calculator
Calculate volume, surface area, and circumference of a sphere.
Cylinder Calculator
Calculate volume, surface area, and lateral area of a cylinder.
Cone Calculator
Calculate volume, surface area, and slant height of a cone.
Regular Polygon Calculator
Calculate area, perimeter, and interior angles of regular polygons.
Arc Length Calculator
Calculate arc length and sector area from radius and angle.
IBU Calculator
Calculate International Bitterness Units for homebrewing using Tinseth formula.
Carbonation Calculator
Calculate priming sugar or force carbonation PSI for homebrewing.
Espresso Shot Calculator
Calculate brew ratio, dose, and yield for perfect espresso shots.
Cold Brew Ratio Calculator
Calculate coffee-to-water ratios for cold brew concentrate and ready-to-drink.
Batch Cocktail Calculator
Scale cocktail recipes for batches with dilution adjustment.
EV Charging Time Calculator
Calculate charging time by charger level, battery size, and charge state.
Fuel Cost Per Trip Calculator
Calculate gas cost for any trip from distance, MPG, and gas price.
Car Affordability Calculator
Calculate the maximum car price you can afford from income and debts.
Commute Cost Calculator
Calculate daily, monthly, and annual commute costs vs transit.
Car Maintenance Schedule Calculator
Track upcoming maintenance by mileage intervals.
Horse Feed Calculator
Calculate daily hay and grain amounts by horse weight and work level.
Rabbit Hutch Size Calculator
Calculate minimum hutch and exercise area for rabbits by breed size.
Bird Cage Size Calculator
Calculate minimum cage dimensions by bird species and count.
Pond Volume Calculator
Calculate pond water volume in gallons with pump and fish capacity.
Terrarium Size Calculator
Calculate minimum terrarium size for reptiles by body length.
GRE Score Percentile Calculator
Convert GRE scores to estimated percentiles for verbal, quant, and AWA.
College Cost Calculator
Estimate 4-year college costs with tuition, room, board, and inflation.
Work-Study Earnings Calculator
Calculate semester and annual work-study earnings.
Hourly to Salary Calculator
Convert hourly rate to annual salary with overtime.
Employee Benefits Value Calculator
Calculate total dollar value of your employee benefits package.
Plastic Footprint Calculator
Estimate your annual plastic consumption and find reduction tips.
Food Waste Calculator
Calculate how much food and money your household wastes annually.
Recycling Impact Calculator
Calculate trees, water, and energy saved by recycling.
Home Solar Savings Calculator
Estimate solar system size, 25-year savings, and payback period.
Composting Calculator
Calculate compost output, landfill diversion, and carbon offset.
Scrabble Score Calculator
Calculate word scores with letter and word multipliers.
D&D Spell Slot Tracker
Track spell slots by class and level with rest mechanics.
Password Strength Checker
Analyze password strength, entropy, and estimated crack time.
Color Name Finder
Find the closest named CSS, Pantone, and RAL color to any hex value.
Character Count Analyzer
Count characters, words, and sentences with social media limit checks.
Military Time Converter
Convert between 12-hour and 24-hour military time formats.
Scientific Notation Converter
Convert between standard and scientific notation.
Decibel Calculator
Calculate dB difference for power and voltage with common reference levels.
Cooking Unit Converter
Convert between cups, tbsp, tsp, oz, mL, and ingredient weights.
Bra Size Calculator
Calculate bra size from measurements with US, UK, EU, AU conversion.
Swimming Pace Calculator
Calculate swim pace, speed, and projected times for all distances.
Calorie Burn Calculator
Calculate calories burned for 30+ activities using MET values.
Tennis Stats Calculator
Calculate serve percentage, winner-to-UE ratio, and performance rating.
Bodyweight Exercise Calculator
Calculate calories and volume load for bodyweight exercises.
Hiking Time Calculator
Estimate hiking time using Naismith's rule with elevation gain.
Wedding Budget Calculator
Allocate wedding budget by category with per-guest cost tracking.
Moving Checklist Generator
Generate an 8-week moving timeline with categorized tasks.
Paint Quantity Calculator
Calculate paint and primer needed with door/window exclusions.
Noise Reduction Calculator
Calculate sound attenuation through barriers and distance.
Birthday Calculator
Find your birth day, zodiac signs, birthstone, and days alive.