Percentage Calculator
Our free percentage calculator handles every type of percentage problem: find what percent of a number, calculate percentage change between two values, and compute percentage increase or decrease.
Formula reviewed for accuracy. Our methodology & sources
Percentage Calculator
percentage calculator
How It Works
The mode you pick tells the calculator which percentage relationship to solve. "What is X% of Y" scales one number by another; "X is what % of Y" turns a part and a whole into a percentage; and the change, increase, and decrease modes compare two values or apply a percentage shift. Every mode comes down to the same core idea — a percentage is just a fraction out of 100 — so the calculator also returns a plain-language explanation of how it reached the answer.
Formula
% of: Result = (X/100) × Y What %: Result = (X/Y) × 100 % Change: Result = ((Y-X)/X) × 100
Examples
25% of 200
Basic percentage of a number.
Change from 80 to 100
Percentage increase from 80 to 100 = 25%.
Frequently Asked Questions
How do I calculate a percentage of a number?
To find X% of Y: multiply Y by X, then divide by 100. For example, 25% of 200 = (200 × 25) / 100 = 50.
How do I calculate percentage change?
Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result means an increase; negative means a decrease.
How do I add a percentage to a number?
To increase a number by X%: multiply the number by (1 + X/100). For example, 200 + 15% = 200 × 1.15 = 230.
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