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Percentage Calculator
What is Percentage Calculator?
A percentage calculator answers three common questions: what is X percent of Y, X is what percent of Y, and what is the percent change from X to Y. Results update as you type.
How Percentage Calculator helps
- Instant everyday percentage maths
- Three calculations in one page
- Useful for discounts, grades and growth
How to use Percentage Calculator
- Enter your numbers in the fields (sample values are pre-filled).
- Read the results, which update instantly.
- Change one input at a time to compare scenarios.
Example
20 percent of 250 is 50, and a change from 80 to 100 is a 25 percent increase.
Frequently asked questions
How is percent change calculated?
(new - old) / old x 100.
What if the starting value is zero?
Percent change is undefined, so the tool shows n/a.
Are results rounded?
Yes, to two decimal places.
Results are estimates for general information only and are not financial, tax or investment advice. Check numbers with a qualified professional.
Last updated September 30, 2026.