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Percentage Calculator

Three everyday percentage problems, solved as you type.

How it works

X% of Y = (X/100)×Y. X is what % of Y = (X/Y)×100. Percent change = ((new−old)/|old|)×100 — positive means increase, negative means decrease.

Frequently asked questions

How do I calculate 20% off a price?

Multiply the price by 0.80. A $250 item at 20% off costs $200 — the same as "what is 80% of 250" above.

What is the difference between percent and percentage points?

Going from 20% to 25% is a 5 percentage point rise but a 25 percent increase (5/20). News headlines mix these up constantly.

How do I add a percent to a number?

Multiply by (1 + p/100). Adding 8% tax to $50: 50 × 1.08 = $54.

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