What you provide
What you provide
- Circle radius: Distance from sector center to curved edge.
- Central angle: Sector angle from 0 through 360 degrees.
CIRCLE GEOMETRY / WEDGE
Sector Area Calculator
Calculate circular-sector area, boundary perimeter, and arc length from a positive radius and central angle.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
The central-angle share of a full turn scales circle area and circumference; two radii complete perimeter.
Calculation path
Sector area = pi r^2 x angle / 360.
What you receive
What you receive
- Sector area
- Arc length and total perimeter
- Percentage of full circle
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
The sector uses a perfect circle and a degree angle; a zero-degree sector produces zero area and arc.
This is an educational planning result, not a structural, electrical, thermal, solar, battery, generator, or safety design. Confirm specifications, units, codes, and professional requirements before acting.