EVERYDAY CLARITY
Radius Calculator
What is the radius of a circle with this circumference? Enter the values below to calculate the result.
Your result
radius
length
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Circumference (length) | Enter circumference in length; use the same basis as the other measurements. |
Understanding your result
Read radius (length) in the units and model stated on this page. The formula radius=circumference/(2*pi) defines the relationship; measurement accuracy and model applicability are separate from numerical precision.
Common mistakes
- Mixing input units or changing the physical meaning of a variable without changing the model.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Calculation checks, sources and review limits
What is the radius of a circle with this circumference?
What is the radius of a circle with this circumference? Enter the values below to calculate the result.
Common uses
- What is the radius of a circle with this circumference
How it works
radius=circumference/(2*pi)
Worked example
Enter Circumference: 31.41592653589793 length. Results: radius: 5 length.