Percentage calculator.
Switch between three common percentage problems, enter two numbers, and see a clear calculated result.
Free to useNo signup requiredProcessed in your browser
Result3020% of 150
For percentage change, a positive result means an increase and a negative result means a decrease. Results are rounded for display.
How to use this tool
- Choose the calculation you need: percent of a number, what percent, or percentage change.
- Enter the two numbers into the labeled fields.
- Read the result instantly; positive percentage change represents an increase and negative represents a decrease.
Good to know
Percentage change uses the absolute starting value as the reference. A zero starting value has no defined percentage change; similarly, a part cannot be expressed as a percentage of a zero whole.
This utility processes your input locally in your browser. RezSat Tools does not upload your input to its servers. As with any online tool, avoid entering sensitive information on devices you do not trust.