Geometry Calculator
Area, perimeter and volume for common 2D and 3D shapes.
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Geometry Calculator
Calculate area, perimeter and circumference for common 2D shapes.
Area
Perimeter
Circumference
Choose a shape, enter its dimensions, then press Calculate.
How geometry formulas work
- Square — area = side², perimeter = 4 × side.
- Rectangle — area = length × width, perimeter = 2(length + width).
- Triangle — area = ½ × base × height.
- Circle — area = πr², circumference = 2πr.
Example: a circle with radius 5 has area ≈ 78.54 and circumference ≈ 31.42.