Percent Change

Measure the percentage increase or decrease between two numbers — a price hike, a stock move, a weight change. It reports both the percent change and the raw difference.

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💡 Good to know: Percentage changes don't reverse: +50% then −50% doesn't return you to the start, because the base you divide by changed.

Worked example

Change: 25% · Difference: 25

How it’s solved

Worked on the example above, step by step — follow along and you can do it on paper next time, no tool required.

Percent change measures the gap between the new and old values as a share of the old value.
Find the raw difference (new − old)
125 − 100 = 25
Divide by the old value
25 ÷ 100 = 0.25
Multiply by 100 for a percent
0.25 × 100 = 25%

Learn the method

Inputs

From
100
To
125

Frequently asked

Going from 100 to 125 is what change?

A 25% increase, a difference of 25.

How is percent change calculated?

(New − Old) ÷ Old × 100. A drop from 125 to 100 shows as −20%.