Percentage Calculator

Negative values are supported. Percentage change uses the absolute starting value as its base, and a zero starting value cannot produce a percentage change.

Find a percentage of a value, calculate percentage change, and work out what percent one value is of another.

This tool runs locally in your browser. It does not upload your input, require an account, or store your data on a server. If a feature needs a network request, the interface asks before sending anything.