Calculate area, perimeter, and volume for common 2D and 3D shapes with interactive visual diagrams.
Geometry Shape Calculator converts the defining dimensions of a selected 2D figure or 3D solid into the measurements associated with that shape. Enter the labeled lengths, such as a rectangle's length and width, and the calculator applies the corresponding geometry formulas while showing an interactive diagram of the figure. The important distinction is dimensional: perimeter is measured in ordinary length units, area in square units, and volume in cubic units. A frequent error is entering a circle's diameter where the requested measurement is its radius.
A concrete input and expected output from the current implementation.
Input
Shape: Rectangle Length: 5 Width: 3
Expected output
Area: 15 square units Perimeter: 16 units
Rectangle area is length times width, so 5 times 3 equals 15. Its perimeter is twice the sum of the two side lengths: 2 times (5 plus 3) equals 16.
The selected shape determines which dimension fields are relevant and which results can be calculated. A rectangle requires length and width, while circles and solids use measurements appropriate to their geometry. Each displayed result comes from the standard formula for that exact figure, so changing the selected shape changes both the required inputs and the meaning of the output.
Perimeter describes the total boundary length of a 2D figure, area describes the region it encloses, and volume describes the space inside a 3D solid. The interactive diagram helps identify the entered dimensions, but the numerical fields define the calculation. Use the computed values, rather than the apparent size of the drawing, when comparing shapes.
The results inherit the unit used for the entered lengths. If every dimension is in centimeters, perimeter is in centimeters, area is in square centimeters, and volume is in cubic centimeters. A bare numeric input does not establish a real-world unit by itself. Do not combine, for example, meters and centimeters without converting one of them first.
No. Treat the diagram as a visual guide to the selected shape and its named dimensions, not as evidence that two objects will fit together or that displayed proportions match physical measurements. Fit, clearance, and fabrication decisions require consistently scaled dimensions and may also need allowances for thickness, tolerances, joints, or material removed during cutting.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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