Calculate the area of 8 common shapes instantly. Select a shape, enter dimensions, and get the area with the formula shown.
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Choose from 8 shapes. Input fields update automatically.
Fill in the required measurements. The labels tell you what each field needs.
Select m², cm², ft², in², km², or yd². The unit label updates everywhere.
All 8 shapes use exact geometric formulas. The circle sector formula is (θ/360) × π × r² where θ is the central angle in degrees.
Area = π × r². For a circle with radius 5m: Area = π × 25 = 78.54 m².
Break it into regular shapes (rectangles, triangles, semicircles), calculate each area separately, then add them together.
Area is the space inside a shape (measured in square units). Perimeter is the total length of the boundary (measured in linear units).
1 m² = 10.764 ft². So a 50 m² room = 538.2 ft².
Area = π × r² = 3.14159 × 5² = 3.14159 × 25 = 78.54 square units. The area grows with the square of the radius — doubling the radius quadruples the area.