Percentage Calculator

Calculate a percentage of a number, a percentage discount, or the percentage change between two numbers.

How it works

  1. Pick a calculation ‘X% of Y’, ‘Y off X’, or ‘change from X to Y’.
  2. Enter your numbers the result updates instantly as you type.
  3. Use the result no sign-up, nothing is stored.

Frequently asked questions

How is percentage change calculated?

(New value − Old value) ÷ Old value × 100. A negative result means a decrease.

Does this round the result?

Results are shown to 2 decimal places for readability; the underlying calculation is full precision.

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