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Percentage Change Calculator

Calculators · Done in 3 steps

Stays on your deviceFree · No sign-up
  1. 1Choose a mode
  2. 2
  3. 3
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About

Find the percentage change between two values, apply a percent increase or decrease, or reverse a change to find the original value.

How to use it

  1. 1Choose a mode: change from A to B, increase/decrease by a percent, or find the original value.
  2. 2Enter the values (use a negative percent for a decrease).
  3. 3See the result plus the change back, the symmetric percent difference and the multiple.
  4. 4Share or reset when done.
You give
Old and new values, or a value and a percent
You get
Percent change, new value or original value
Good to know
Uses the old value as the base for percent change; percent difference uses the average of both. Every input is saved in the page URL, so you can bookmark or share a result.
Privacy
Processed on your device. Nothing is uploaded, stored or logged.
Last tested
2026-10-28

FAQ

What’s the difference between percent change and percent difference?

Percent change has a direction and a base (the old value). Percent difference compares two values without either being the reference, dividing by their average.

How do I find the price before a 20% increase?

Divide by 1.2, don’t multiply by 0.8. A $96 price after a 20% rise was $80.

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