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About this tool
The three results answer different questions: a percentage of the base, your value as a percentage of the base, and your value adjusted by the percentage. Enter a negative percentage for a decrease or discount.
How to use it
- Enter the value, percentage and base.
- Read the labelled result for the calculation you need.
- Change the percentage to a negative number to calculate a decrease.
Common questions
How do I calculate a 20% discount on 50?
Enter 50 as the value and -20 as the percentage. The adjusted value is 40.
Why can I not calculate a percentage of a zero base?
Expressing a value as a percentage of the base involves division by the base. Division by zero is undefined.