Percentage Calculator Online
Free, instant, no sign-up — find what percentage one number is of another. Enter the part and the whole to get the percentage online instantly.
Percentage
—
The part expressed as a percentage of the whole. Both numbers must be provided.
What is an online percentage calculator?
An online percentage calculator works out the relationship between two numbers as a percentage, right in your browser with no download or sign-up. The most common question it answers is: what percentage is the part of the whole? For example, if 25 out of 200 visitors bought a product, the online calculator tells you that 12.5% of visitors converted.
The formula is (part / whole) × 100. The part is divided by the whole, so the result is always the share of the whole that the part represents. For 25 of 200, the online percentage is 12.5%. The same method works for test scores, survey results, or any part-versus-whole question.
This differs from percentage increase, which measures change between two values. Use the online percentage calculator when you want a share of a total, and the percentage increase calculator when you want growth from one value to another.
How to use the online percentage calculator
- 1
Enter the part
Type the share you are measuring — the number of visitors who converted, the marks scored, or the portion of the total you want as a percentage.
- 2
Enter the whole
Type the total figure. The calculator divides the part by the whole and multiplies by 100 to get the percentage.
- 3
Read the percentage
The result shows what percentage the part is of the whole, so you can see the share at a glance without any manual math.
Why use our online percentage calculator?
Free and instant
No account, no download, no sign-up. Open the page, enter your numbers, and get the percentage the moment both values are in.
Works on any device
The calculator is responsive and runs in any browser, on phones, tablets, and desktops, so you can work out percentages anywhere.
Private
The math runs entirely in your browser. Your numbers never leave your device, which keeps your data private and the tool fast.
FAQ
Frequently Asked Questions
Quick answers to common questions about percentage calculations.
Related Calculators
Explore More Tools
Explore more free percentage tools for increase, change, difference, and share calculations.