Circle sector area
Geometry / FREE CALCULATOR
Find the area of a circular sector.
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
3.141592653589793*Radius*Radius*Central angle (degrees)/360
Worked example
Radius = 6; Central angle (degrees) = 90. Result: 28.2743 square units.
Understand your result
Find the area of a circular sector. The result is expressed in square units.
Assumptions and limitations
Angle is in degrees; the sector is bounded by two radii and their arc. Results are rounded for display.
Questions about this tool
What does this tool calculate?
Find the area of a circular sector.
What should I check before using the answer?
Angle is in degrees; the sector is bounded by two radii and their arc.
Related guides
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