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Percentage Calculator

Calculate a percentage of an amount and the percentage change between values.

When to use this tool

How to use

  1. Enter the amount and percentage, or the original and new values.

Examples

Input: Percentage of a Number: 25%, total 200
Result: 50, calculated as 25 ÷ 100 × 200.
Input: Percentage Change: original 50 → new 75
Result: +50.00%. The difference of 25 is divided by the original 50.
Input: Percentage Change: original 75 → new 50
Result: -33.33%. Reversing the same difference uses a different base of 75.

Before you start

Frequently asked questions

What should I check?

Percentage change needs a nonzero original value. This is not a tax calculator.

Which formula does percentage change use?

(New−original) ÷ |original| × 100. Negative values are accepted: -50→-25 gives +50.00%. Check that this absolute-base convention fits data such as losses or debt.

Is percentage change the same as percentage points?

No. A rate moving from 20% to 30% rises by 10 percentage points. Entering 20→30 here gives the relative increase, +50.00%. There is no separate percentage-point result.