Calculyn

Percentage Change Calculator

Calculate the percent increase or decrease between two numbers.

Results update as you type.

Percent increase

25%
Difference
20
Percent increase25%

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How it works

Percent change compares the difference between two values to the original value.

Formula

% change = (New − Original) ÷ |Original| × 100

Example

Going from 80 to 100 is a 25% increase. Going from 100 to 80 is a 20% decrease.

Assumptions & limitations

  • Results are rounded for display.

Frequently asked questions

Why isn't a 20% drop reversed by a 20% rise?

Because each percentage is taken from a different starting value.