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📊 Percentage Calculator

Calculate X% of Y, find percentage share, reverse a percent, and measure percentage change.

Enter 20 for 20%. The percentage change mode returns relative change using the starting value as the denominator, not percentage points.

Find the value of X% of Y.

Calculate what percent A is of B.

Find the base value when A is P% of it.

Calculate the relative percentage change from A to B using the standard formula.

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Free online percentage calculator for finding X% of Y, calculating what percent one value is of another, reversing a percent to find the base value, and measuring percentage change. Runs instantly in your browser and clearly distinguishes relative percent change from percentage points.