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Percentage Calculator

A percentage is just a fraction of 100, and this calculator finds any slice of any number. Type the percentage and the number — the result updates as you type, with the formula shown so you can check the math.

How the percentage calculator works

A percentage is just a fraction of 100, and this calculator finds any slice of any number. Type the percentage and the number — the result updates as you type, with the formula shown so you can check the math.

The formula

(percentage ÷ 100) × number

Worked example

What is 20% of 70? Divide 20 by 100 to get 0.20, then multiply by 70. The answer is 14 — so a 20% slice of 70 is 14.

Where this comes in handy

Sale prices: find 25% off a $60 jacket before you reach the register.
Tips and fees: work out 15% of a $48 bill in seconds.
Budgeting: see what 30% of your paycheck sets aside for savings.
Grades and scores: convert 17 correct answers out of 20 into 85%.

Percentage Calculator — frequently asked questions

How do you calculate a percentage of a number by hand?

Divide the percentage by 100 to turn it into a decimal, then multiply by the number. For 30% of 90: 0.30 × 90 = 27.

What does "percent" literally mean?

It comes from the Latin "per centum," meaning "per hundred." So 45% is simply 45 out of every 100.

How do I find 10% of a number quickly?

Move the decimal point one place to the left: 10% of 240 is 24. From there you can build 20%, 5%, or 15% with simple addition and halving.

Can a percentage be more than 100%?

Yes. Percentages above 100% just mean "more than the whole" — 150% of 40 is 60. This comes up with growth figures and markups.

Why do stores show the percentage off instead of the final price?

A percentage frames the deal relative to the original price, which makes the saving feel concrete. This calculator lets you verify the actual final price yourself.