Percentage Calculator
Three percentage calculations in one tool: find X% of a number, work out what percentage one number is of another, or measure the percentage change between two values.
How is this calculated?
X% of Y = (X / 100) × Y. A is what % of B = (A / B) × 100. % change from A to B = ((B − A) / A) × 100. Negative results indicate a decrease.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For 25% of 200: (25 ÷ 100) × 200 = 50.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For 25 out of 50: (25 ÷ 50) × 100 = 50%.
How do I calculate percentage change?
Subtract the original from the new, divide by the original, multiply by 100. From 100 to 125: ((125 − 100) ÷ 100) × 100 = 25% increase.
What's the difference between percentage points and percent?
Going from 4% to 6% is a 2-percentage-point rise but a 50% relative increase. Always specify which you mean — they're easy to confuse.
How do I add a percentage to a number?
Multiply the number by (1 + percentage/100). To add 23% VAT to €100: 100 × 1.23 = €123. To remove a percentage, divide by (1 + percentage/100).
Last updated: May 2026 · Rates sourced from Revenue