About This Calculator
This calculator computes the circumference of a circle using either the radius or diameter. You can also enter a custom value of π if needed.
How It Works
- Enter either the radius or diameter of the circle. The other value will be auto-filled.
- Optionally, you can provide a custom value for π (default is 3.14159).
- Click "Calculate" to get the circumference along with the calculation steps.
Circumference = 2 × π × r
or
Circumference = π × d
or
Circumference = π × d
Frequently Asked Questions
Can I enter either radius or diameter?
Yes, you can enter either one and the other will be calculated automatically.
What if I want to use π = 3.14?
You can override the default π value by typing 3.14 or any number you prefer into the input box.