basic

Sector Area Calculator

Area of a circular sector from radius and angle.

Compute the area of a circular sector ("pie slice") from the radius and the central angle in degrees.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Area = ½ · r² · θ (rad) = π · r² · (θ° / 360)

In depth

Compute the area of a circular sector ("pie slice") from the radius and the central angle in degrees.