Percentage Calculator
Find a percentage of a number, what percent one number is of another, or the percentage increase or decrease between two values — like PercentageCalculator.net.
What is % of ?
50
is what % of ?
25%
Percentage increase / decrease
25%
25% increase
Change: 25
Formula
How it works
Examples
About this calculator
The Percentage Calculator helps you solve everyday percent problems in seconds—what a percentage of a number is, what percent one value is of another, and how much a value increased or decreased. Results update live as you type.
Three common percent modes
Find X% of Y, discover what percent one number is of another, or measure percentage change between two values—all on one page.
Instant, readable results
No button to press. Enter your numbers and see answers immediately, formatted for quick reading on desktop or mobile.
Built for real-life math
Use it for discounts, tips, tax estimates, exam scores, price changes, and any quick percentage check at work or home.
- Shopping discounts
- Tips & tax estimates
- Grade & score checks
- Price change analysis
Frequently asked questions
Quick answers about this calculator—how it works, accuracy, and everyday use.
A percentage expresses a number as a fraction of 100. For example, 25% means 25 out of every 100 parts. Percentages are useful for discounts, taxes, tips, growth rates, and comparing values.
To find what percent one number is of another, divide the part by the whole and multiply by 100. To find a percentage of a number, multiply the number by the percent and divide by 100 (or move the decimal two places left on the percent).
Yes. Enter a starting value and an ending value to see the percent change, whether it is an increase or decrease, and the absolute difference between the two numbers.
Percentages appear everywhere—from sale prices and loan rates to exam scores and business margins. Understanding them helps you compare options quickly and make clearer financial and everyday decisions.