Percentage Calculator

Calculate percentages instantly — find X% of Y, what percent X is of Y, and percentage change.

Choose a calculation type

What is% of?

15% × 200

= 15/100 × 200

= 0.15 × 200

= 30

How Percentages Work

A percentage is a way of expressing a number as a fraction of 100. The word "percent" comes from the Latin per centum, meaning "by the hundred." Percentages are used everywhere — from sales tax and discounts to exam scores, investment returns, and statistical data.

There are three fundamental percentage calculations: finding a percentage of a number (e.g., "What is 15% of 200?"), finding what percentage one number is of another (e.g., "30 is what percent of 200?"), and finding the original number when you know a percentage (e.g., "30 is 15% of what number?"). This calculator handles all three, plus percentage change between two values. For dedicated percentage increase/decrease calculations, see our percentage increase calculator. You can also convert percentages to fractions or decimals.

Frequently Asked Questions

How do I calculate what percent X is of Y?

Divide X by Y, then multiply by 100. For example, to find what percent 25 is of 200: (25 ÷ 200) × 100 = 12.5%.

How do I calculate X% of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 200 = (200 × 15) ÷ 100 = 30.

What is the difference between percentage change and percentage difference?

Percentage change measures the change from an old value to a new value relative to the old value. Percentage difference measures how two values differ relative to their average.

How do I convert a percentage to a fraction?

Put the percentage over 100 and simplify. For example, 75% = 75/100 = 3/4.

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