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Percentage Calculator

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

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About the Percentage Calculator

The Percentage Calculator covers the three percentage questions that come up constantly — in discounts, exam marks, tips, tax and price changes. One mode finds a percentage of a number, another finds what percent one number is of another, and the third works out percentage increase or decrease between two values, with a plain-English explanation of each result.

How to use it

  1. Choose a mode: % of a number, What % is it?, or % change.
  2. Enter the two numbers.
  3. Read the result and the sentence explaining what it means.

Frequently asked questions

How do I find a percentage of a number?

Divide the percentage by 100 and multiply by the number. For example, 20% of 150 is 0.20 × 150 = 30 — the first mode does this for you.

How do I calculate a discount price?

Work out the percentage of the original price, then subtract it. Or use % change mode afterwards to check the saving. A 30% discount on 80 means you save 24 and pay 56.

How is percentage change calculated?

Subtract the old value from the new value, divide by the old value, and multiply by 100. A rise from 80 to 100 is (20 ÷ 80) × 100 = a 25% increase.

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