Calculated result
Enter measurements and select Calculate.
Formula
Arc length = rθ when θ is measured in radians. Degree inputs are converted with θ × π ÷ 180. Angles must be no more than one full circle.
Ownership boundary
This calculator measures a selected arc. The Circumference Calculator remains the canonical tool for a complete circle.
Worked example
The editable example values above demonstrate the formula and expose each assumption used in the result.