Example
Compare 80 with 100 to see an increase of 20, or 25%.
Math
Percentage Change Calculator
Find the amount and percentage of an increase or decrease.
● ToolEnter your information below
Amount of change+20Percentage change+25%DirectionIncrease
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Plain-language reference
How this tool gets the answer
What it calculates
Find the amount and percentage of an increase or decrease.
Method
Percentage change is calculated as (new value − starting value) ÷ the absolute starting value × 100.
Keep in mind
Rounding and unit conventions can affect the displayed result; retain enough precision for the decision you are making. This limitation is especially important when using the percentage change calculator for a consequential or shared decision.
Page owner: Anchor Apps LLC · Calculation and content last verified August 9, 2026.