Percentage Calculator
Calculate percentages, percentage increases and decreases, and find what percent one number is of another. Free and instant.
What is X% of Y?
15% of 200
30
X is what percent of Y?
30 is what % of 200
15%
Percentage change from X to Y
Change from 100 to 125
+25%
Increase
Why use our Percentage Calculator?
Three calculation modes
Percentage of a number, what percent is X of Y, and percentage change.
Instant results
Answers update in real time as you type — no buttons to press.
Private
All calculation happens in your browser. Your inputs are never sent anywhere.
How to use Percentage Calculator
- 1
Choose the type of percentage calculation you need (three modes are provided).
- 2
Enter the two numbers in the input fields.
- 3
The result appears instantly below the inputs — no button to press.
- 4
Copy the result to your clipboard with the copy button if needed.
About Percentage Calculator
The Percentage Calculator solves three common percentage problems instantly: what is X% of Y, X is what percent of Y, and what is the percentage increase or decrease from X to Y. Whether you're calculating discounts, tax, tips, commission, test scores, or business growth, this tool gives you the answer immediately — no formulas to memorize, no calculator button-mashing. The calculator runs entirely in your browser, so your inputs are never sent anywhere. Results update in real time as you type, and you can copy any result with a single click.
Privacy
All calculations happen entirely in your browser. Your inputs are never sent to any server or stored anywhere.
Limitations
Results are rounded to 4 decimal places. For financial or scientific calculations requiring higher precision, use a dedicated tool.