Percentage Calculator – Of a Number and % Change

This percentage calculator has two modes: a percentage of a number, and percentage change from an original value to a new value.

How to use this calculator

This percentage calculator has two modes: a percentage of a number, and percentage change from an original value to a new value. Results stay in your browser. They are estimates, not financial, tax or medical advice.

Frequently asked questions

How do I find 18% of a number?

Choose percentage of a number, enter 18 and the number. Result = 18 / 100 × number.

Why is percentage change invalid from zero?

Change divides by the original value, which cannot be zero.