Solve every common percentage question in one place — what is X% of Y, X is what percent of Y, percentage increase or decrease, and the percentage difference between two values. Results update as you type.
How to use the Percentage Calculator
- Pick the calculation you need from the four calculators below.
- Type your two numbers.
- The answer and the formula used appear instantly.
Percentage formulas
X% of Y = Y × X ÷ 100. Example: 15% of 200 = 30.
X is what % of Y = X ÷ Y × 100. Example: 30 is 15% of 200.
Percentage change from A to B = (B − A) ÷ |A| × 100. From 50 to 65 is a 30% increase.
Percentage difference = |A − B| ÷ ((A + B) ÷ 2) × 100 — used when neither value is the reference.
Frequently asked questions
How do I calculate a percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100.
What is the difference between percentage change and percentage difference?
Percentage change measures change relative to a starting value. Percentage difference compares two values relative to their average, with no direction.
How do I reverse a percentage?
If a price after a 20% increase is 120, the original is 120 ÷ 1.2 = 100.