Calculate percentages, percentage change, and percentage of a number.
Enter a percentage and a value to calculate the result instantly.
Enter a value, then tap a percentage to instantly calculate.
No calculations saved yet.
Click "Save to History" on any result to keep it here.
Keeps the last 5 calculations. History resets when you leave the page.
X% of Y
(X / 100) × Y
Example: 15% of 200 = 30
X is what % of Y
(X / Y) × 100
Example: 45 is 22.5% of 200
% Change
(New - Old) / |Old| × 100
Example: 100 → 130 = +30%
% Difference
|A - B| / Avg(|A|, |B|) × 100
Example: 80 vs 120 = 40%
Free percentage calculator that handles all common percentage operations: find what percent one number is of another, calculate percentage increase or decrease between two values, determine a percentage of any number, and compute tip amounts. Useful for students, shoppers comparing discounts, business professionals analyzing growth metrics, and anyone working with proportional data.
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