Everyday Calculators
Percentage calculator
Find a percentage of a number, express a part as a percentage, or work out the whole from a known part and percentage.
JavaScript is required to run the interactive tool. Open the tool separately if it does not load in the frame.
How to use it
Choose a calculation and enter the two values shown by the field labels. Use the example below the selector to check which value goes where.
Example
20% of 50 is 10. A part of 20 out of 50 is 40%. If 20 is 40% of the whole, the whole is 50.
Frequently asked question
Which value goes in the first field?
The field labels change with the calculation. To find the whole, enter the known part first and its percentage second.
Limits and privacy
A zero divisor is rejected. This calculator uses JavaScript number arithmetic and is not intended for regulated financial calculations.
Tool input is processed in a separate browser environment without advertising or analytics scripts. This page does not upload it to the service.