Three percentage questions

Percentage Calculator

Calculate a percentage of a number, percentage change, or percentage difference with the formula shown.

Method

How this tool works

Percentage of = rate ÷ 100 × value. Change = (new − original) ÷ |original| × 100. Difference uses the average magnitude as its denominator.

Worked example

20% of 80 is 16. A move from 50 to 60 is a 20% increase.

Use responsibly

Percentage change is undefined when the original value is zero. Percentage points and percentage change are not the same.

Last reviewed: 20 July 2026
Calculation and copy checked for this release.