Percentage Calculator

Calculate percentages instantly: find what X percent of a number is, work out what percent one number is of another, and measure percentage change between two values. Everything runs in your browser, so nothing you type leaves your device.

The percentage to apply.

The base number.

The part value.

The whole value. Must be greater than zero.

The starting value.

The ending value.

Result

Enter your values and press Calculate — the result appears here.

Worked examples

25% of 200

  • mode = of
  • percent = 25
  • value = 200

Result: 50

What percent is 50 of 200?

  • mode = what
  • part = 50
  • whole = 200

Result: 25%

100 to 150

  • mode = change
  • from = 100
  • to = 150

Result: +50%

Frequently asked questions

How do I calculate 25% of 200?

Multiply 200 by 25 and divide by 100: 200 × 25 ÷ 100 = 50. The calculator does exactly this: pick "What is X% of Y?", enter 25 and 200, and it returns 50.

How is percentage change calculated?

Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 100 to 150 is a 50% increase: (150 − 100) ÷ 100 × 100 = 50.

Do my numbers leave my device?

No. This tool calculates in your browser and does not send your inputs to any server.

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