How do I find what X% of Y is?

Multiply Y by X and divide by 100. For example, 15% of 200 is 200 x 15 / 100 = 30.

How do I calculate percentage increase?

Subtract the original value from the new value, divide by the original, and multiply by 100. A rise from 80 to 100 is a 25% increase.

Yes. It is free, runs in your browser, and no data is uploaded.

Home › Calculators › Percentage Calculator

Find a percent of a number, what percent one number is of another, or percentage change — instantly and privately.

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First value (X)

Second value (Y)

X% of Y          = (X / 100) × Y
X is what % of Y = (X / Y) × 100
% change  X→Y     = ((Y − X) / X) × 100

200 × 15 ÷ 100 = 30.

((new − original) ÷ original) × 100. A rise from 80 to 100 is a 25% increase.

Yes — everything runs in your browser.

Yes, every calculator is completely free, with no signup and no limits.

No. Everything runs in your browser — no install, no account.