Circle Calculator
Enter any one property of a circle — radius, diameter, area, or circumference — and instantly calculate all the others.
Results
5.000000
10.000000
78.539816
31.415927
Formulas
- 100% free — no account needed
- Runs in your browser
- Nothing is uploaded
Frequently asked questions
Is Circle Calculator really free?
Yes. Circle Calculator is completely free on PureBrowser — every feature, with no account, no trial, and no credit card.
Does Circle Calculator upload my data?
No. Circle Calculator runs entirely inside your browser, so anything you type, paste, or open stays on your own device.
Do I need to sign up or install anything?
Neither. There is no account and nothing to download — open the page and Circle Calculator is ready to use on desktop or mobile.
Does Circle Calculator work offline?
Once the page has loaded, yes. All of the processing happens locally in your browser, so it keeps working without a connection.
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