Circular arc length
Geometry / FREE CALCULATOR
Calculate the length along a circular arc.
Your answer starts here.
Enter your values and select Calculate to see the result and any available breakdown.
How to use this calculator
- Enter radius. Use the unit shown beside the field.
- Enter central angle (degrees). Use the unit shown beside the field.
- Select Calculate and review the result. Select Reset to restore the example inputs.
How the calculation works
2*3.141592653589793*Radius*Central angle (degrees)/360
Worked example
Radius = 6; Central angle (degrees) = 90. Result: 9.42478 length units.
Understand your result
Calculate the length along a circular arc. The result is expressed in length units.
Assumptions and limitations
Result excludes the two radii forming a sector's sides. Results are rounded for display.
Questions about this tool
What does this tool calculate?
Calculate the length along a circular arc.
What should I check before using the answer?
Result excludes the two radii forming a sector's sides.
Related guides
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