Circle Circumference Calculator
Enter the radius to get the circle's circumference using the formula 2πr.
For educational use.
Examples
- radius 5 ⇒ 31.42 units
- radius 10 ⇒ 62.83 units
FAQ
Can I use diameter instead?
Divide diameter by 2 to get radius first.
What value of π is used?
The calculator uses π ≈ 3.14159.
Additional Information
- Result unit: units