Math Geometry

Free Online Calculator

Sector Area Calculator

Free online Sector Area Calculator with instant results.

Calculate a circle sector’s area from its radius and central angle.

A = ½r²θ (radians) = πr²θ/360 (degrees)
Enter measurements to calculate.

What the variables mean

A is sector area; r is radius; θ is the central angle. The output is expressed in square units.

Worked example

For radius 6 cm and angle 60°, A = π × 6² × 60/360 = 6π ≈ 18.8496 cm².

Frequently asked questions

Can I enter radians?

Yes. Select radians and the calculator uses A = ½r²θ.

Can the angle exceed 360°?

This calculator accepts a single sector with an angle from 0° to 360° inclusive.

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