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Geometry Calculators

From a homework problem to a home-improvement estimate, these calculators find the area of a flat shape, the volume of a solid, or every part of a triangle — each using the standard geometric formulas, with worked examples on every page.

Reach for area for flat shapes, volume for 3D solids, and the triangle solver when you know three sides and need the angles and area. For a room or plot measured in feet, the square footage calculator adds a materials-and-cost angle on top of the same area maths.

Every page lists the formula it uses and a worked example, so the calculator doubles as a way to check work done by hand.

Which calculator should I use?