Percentage Calculator
Calculate percentages three ways — find X% of a number, what percent one number is of another, or the percentage change between two numbers.
Examples
X% of a number
20% of 150
30
What percent
30 is what % of 150
20%
Percentage change
From 100 to 120
20% increase
FAQ
No. Every calculation runs locally in your browser.
(New value − Old value) ÷ Old value × 100. A positive result is an increase, a negative result is a decrease.
Yes, for the percentage change calculation. "X% of a number" and "what percent" expect non-negative values for meaningful results.
Related Tools
Guide
Pick a calculation mode, enter the two numbers it needs, and the result appears instantly.