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Percentage Increase Calculator

Calculate how much a value increased as a percentage of the absolute original value.

How to use this tool

Compare a larger new value with its non-zero original value.

Transparent method

Formula and method

Increase % = ((new value − original value) ÷ |original value|) × 100.

Example

An increase from 80 to 100 is ((100 − 80) ÷ 80) × 100 = 25%.

Assumptions and limits

  • The original value cannot be zero.
  • The new value must be greater than or equal to the original value.

Frequently asked questions

Why can the original value not be zero?

A percentage change divides by the original value, so a zero baseline has no defined percentage change.

Can the calculator use negative numbers?

Yes, but interpretation depends on context. The formula uses the absolute original value as the denominator.

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