Sector Area Calculator
Area of a pie slice of a circle.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Sector area
- 52.3599
- Arc length
- 10.472
- Segment area
- 9.0586
- Chord length
- 10
- Share of full circle
- 16.67%
Quick answer
A sector's area is half the radius squared times the angle in radians.
A = ½r²θ
How to use the Sector Area Calculator
- 1Enter the circle radius.
- 2Enter the sector's central angle in degrees.
- 3Read sector and segment areas.
Frequently asked questions
What is a segment?
The region between a chord and the arc — the sector minus the triangle.
How do I get the angle from the arc?
Divide arc length by radius for radians.