Instant percentage calculations — three modes, zero fuss
Find what a given percentage of a number equals.
Formula: (15 ÷ 100) × 200 = 30
Quick Reference
(X ÷ 100) × Y
e.g. 20% of 150 = 30
(X ÷ Y) × 100
e.g. 30 of 200 = 15%
((New − Old) ÷ |Old|) × 100
e.g. 80 → 100 = +25%
Our free percentage calculator handles three everyday calculations in one place. Find what X% of any number equals, discover what percentage one value is of another, or instantly compute the percentage increase or decrease between two numbers. No sign-up required — just type your values and get precise results you can copy with one click.
Divide the percentage by 100 and multiply by the number. For example, 15% of 200 = (15 ÷ 100) × 200 = 30. Use the 'X% of Y' tab above to do this instantly.
Divide the part by the whole, then multiply by 100. For example, 30 is 15% of 200 because (30 ÷ 200) × 100 = 15. The 'X is what % of Y' mode handles this automatically.
Subtract the original value from the new value, divide by the absolute original value, then multiply by 100. A positive result is an increase; negative is a decrease. Example: 80 to 100 = ((100 − 80) ÷ 80) × 100 = +25%.
Yes. Negative inputs work correctly for all three modes. The percentage change mode shows a '+' or '−' sign on the result to clearly indicate direction.