Percentage Calculator
Four percentage modes in one tool: find a percent of a number, determine what percent one number is of another, calculate percentage change, or convert between markup and margin.
Quick Answer
To find X% of Y, multiply Y by X/100 (e.g., 15% of 200 = 30). To find what percent X is of Y, divide X by Y and multiply by 100. Percentage change is calculated as ((new - old) / |old|) × 100. Markup and margin are different: a 50% markup on a $100 cost gives a $150 price, but the profit margin on that sale is 33.3%.
What is X% of Y?
Enter a percentage and a number to find the result.
About This Tool
The Percentage Calculator is a versatile math tool that handles the four most common percentage calculations people search for every day. Whether you are a student working through homework, a business owner setting prices, or simply figuring out a discount while shopping, this calculator gives you instant, accurate results with the formula shown for every calculation.
Four Modes, One Calculator
“What is X% of Y?”is the most basic percentage operation. It answers questions like “What is 20% of 150?” (answer: 30). This is the mode you reach for when calculating discounts, tips, or tax amounts.
“X is what % of Y?” works in the other direction. If you scored 42 out of 50 on a test, this mode tells you that is 84%. It is also useful for understanding what fraction of a budget has been spent or what share of revenue comes from a particular product.
Percentage Change calculates the increase or decrease between two values. If your rent went from $1,200 to $1,350, that is a 12.5% increase. This mode works for tracking price changes, salary raises, population growth, or any before-and-after comparison.
Understanding Markup vs. Margin
Markup and margin are two different ways of expressing profit as a percentage, and confusing them is one of the most expensive mistakes in business. Markup measures profit relative to cost: if an item costs $60 and sells for $100, the markup is 66.7%. Margin measures profit relative to the selling price: for the same item, the margin is 40%. The markup percentage is always higher than the margin percentage for the same product. This converter shows both side by side so there is never any confusion. Retailers, restaurateurs, and ecommerce sellers use this daily to set prices that hit their profit targets.