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
Yes, Circle Calculator is completely free to use on UtilityCove.
No. Circle Calculator runs in your browser, so your input stays on your device.
Yes. Circle Calculator works on modern mobile and desktop browsers.
Password Strength Checker
Score your password strength and generate stronger ones.
Password Generator
Generate strong random passwords with configurable length and character sets.
Decision Maker
Let the tool randomly pick from your list of options.
Yes or No Wheel
Spin a wheel for a random yes or no answer.
My Screen Size
Detect your current screen resolution and aspect ratio.
Screen Sizes Reference
Common Apple device screen sizes and resolutions.