Runs locally in your browser
Percentage Calculator
Find X percent of Y, what percent one number is of another, percent change, and percent difference. Math stays in this tab.
- X% of Y
- 16.0000
- X is what % of Y
- 25.0000
- Increase X on Y
- 25.0000%
- Decrease X from Y
- -25.0000%
- Percentage difference
- 120.0000%
Enter two numbers when you need parts, shares, lifts, or drops. This is general percentage math, not a shop till with tax.
Formulas evaluate in the browser as you type. No values are stored.
How to use
- Type X and Y.
- Read X percent of Y and what percent X is of Y.
- Check increase, decrease, and percent difference.
How it works
X percent of Y is X divided by 100 times Y. What percent uses X divided by Y times 100. Change uses the gap over the starting Y.
Percent difference divides the absolute gap by the average of the two numbers. A zero denominator returns an error instead of infinity.
Examples
Exam score
18 of 25 is 72 percent. That is a share, not a sale price.
Traffic lift
Going from 800 to 920 visits is a 15 percent increase on the original 800.
FAQ
How is this different from the discount tool?
This page solves general percent questions. The discount tool applies a markdown and optional tax to a price.
What if Y is zero?
Shares and changes that divide by Y cannot run. You will see an error.
Is percent difference the same as change?
No. Difference uses the average of both numbers. Change uses the starting value as the base.
Are numbers sent away?
No. Arithmetic stays in this browser tab.
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