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Percentage Calculator

Fill in the numbers on any card to see the answer and the working.

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Percent of a number

What is % of ?

-

What percent

is what percent of ?

-

Percentage change

What is the change from to ?

-

Increase or decrease by %

by %

-

Original value

After a % the value is . What was it before?

-

How to use

  1. X% of Y is X × Y ÷ 100, X as a percent of Y is X ÷ Y × 100, and percentage change is (new − old) ÷ old × 100.
  2. Type numbers into the card you need. The result appears with the formula filled in with your numbers.
  3. Use “Increase or decrease by %” for sale prices and price rises, and “Original value” to work back to the price before a discount or tax.
  4. Press Copy to grab a result. Your inputs are kept in the page address, so you can share the link.

FAQ

If a price drops 20% and then rises 20%, is it back to where it started?

No. 100 minus 20% is 80, and 80 plus 20% is 96, because the second percentage is taken from a smaller base. To undo a 20% discount, use “Original value”: 80 after a 20% decrease gives 100.

What is the difference between percent and percentage points?

Going from 10% to 15% is a rise of 5 percentage points, but a 50% increase relative to the starting rate. Percentage points compare two rates directly; percent change compares to the starting value.

Why is there no result when the starting value is 0?

Percentage change divides by the starting value, and dividing by zero is undefined, so the card shows “-” instead.

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