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Surface area calculator

Pick one of nine solids, enter its dimensions, and get total and lateral surface area plus volume with the working shown.

Fill in the dimensions to measure the solid.

Every formula runs on full-precision pi and rounds only for display, which is why answers can differ in the last digit from textbook solutions that use 22/7. Scaling is worth watching: double every length and the surface area goes up fourfold while the volume goes up eightfold. What this tool does not do: hollow or open-topped variants (a bowl is not a hemisphere), wall thickness, composite solids, or any check that your real object matches the ideal shape.
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