Percentage Calculator
Calculate percentages instantly: find X% of a number, work out what percentage one number is of another, or calculate percentage increase or decrease.
What is X% of Y?
X is what percentage of Y?
Percentage change from old value to new value
Three common percentage calculations
This tool covers the percentage calculations people need most often: finding a percentage of a number (like a discount or tip), working out what percentage one value is of another, and measuring the percentage change between two values (such as a price rise or a drop in sales).
The formulas
X% of Y = (X ÷ 100) × Y. X is what % of Y = (X ÷ Y) × 100. Percentage change = ((new − old) ÷ old) × 100, where a positive result is an increase and a negative result is a decrease.
A note on zero
You can't divide by zero, so "what percentage of Y" and "percentage change from" both require a non-zero starting value. This tool shows a clear message if you try that instead of returning a meaningless result.
This tool runs entirely in your browser. Nothing you enter is uploaded or stored.
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