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Percentage Calculator

Find a percent of a number, what percent one number is of another, and percent change.

How it works

Enter two numbers and see three answers at once. x% of y is x × y ÷ 100. The share is x ÷ y × 100. Percent change from x to y is (y − x) ÷ x × 100.

Worked example

A jacket costs $80 and is 25% off. Enter 25 as the first number and 80 as the second. The first result, 20, is the discount, so you pay $60. Now enter 80 and 60: the change result is −25%, confirming the price fell by a quarter.

Tips

• A percent change from 50 to 75 is +50%, but from 75 back to 50 is only −33.3%. The starting number matters.
• For a tip, use 15 or 20 as the first number and the bill as the second.
• Percent points and percent are different: moving from 10% to 12% is 2 percentage points but a 20% increase.

Frequently asked questions

How do I work out a discount?

Enter the discount as x and the price as y. The first result is the amount taken off.

What does a negative change mean?

It means the second number is smaller than the first.

How do I add a percentage to a number?

Work out the percentage with the first result, then add it to your number. Adding 20% to 150 gives 150 + 30 = 180.

Why is the percent change not symmetrical?

Because each change is measured against its own starting value.

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