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Percentage Change Calculator

Calculate the percentage increase, decrease, or difference between a starting value and an ending value, plus the plain difference.

About Percentage Change Calculator

Percentage change measures how far a value moved relative to where it started: change = (ending − starting) ÷ |starting| × 100. A positive result is an increase and a negative result is a decrease. The calculator also shows percentage difference, which treats both numbers equally: |a − b| ÷ ((|a| + |b|) ÷ 2) × 100. Percentage change is undefined when the starting value is zero.

Also known as: Percentage Increase Calculator, Percentage Decrease Calculator, Percentage Difference Calculator.

How to use Percentage Change Calculator

  1. Fill in "Starting value" and "Ending value".
  2. The result appears below and updates as you type.
  3. Copy the result with the copy button, or download it as a file where that is offered.

Questions about Percentage Change Calculator

What is the difference between percentage change and percentage difference?

Percentage change compares the new value against the starting value, so direction matters. Percentage difference compares the gap against the average of the two values and gives the same answer whichever number comes first.

Why is the change from 80 to 100 not the same as from 100 to 80?

The base is different. From 80 to 100 the gain of 20 is divided by 80, giving 25%. From 100 to 80 the loss of 20 is divided by 100, giving 20%.

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