Sector Area Calculator

Calculate the area of a circle sector using radius and central angle (in degrees). For full circles, use the Circle Area Calculator. Results automatically convert to square feet, square meters, and acres.

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Circle Area Ellipse Area Polygon Area Triangle Area
Sector Area: —
Formula:
A = (θ / 360) × π × r²
Example:
For r = 10 ft and θ = 90° → Area ≈ 78.54 ft².
Related Calculators:
Circle Area Ellipse Area Polygon Area Triangle Area

Frequently Asked Questions

What is a sector of a circle?

A sector is a portion of a circle defined by a central angle and two radii.

What angle unit does this use?

The calculator uses degrees for the central angle.

Can the angle exceed 360°?

No. 360° represents the full circle.