2 free online calculators with step-by-step solutions
Pick the right tool for your problem — 2D shapes, 3D solids, proofs, or composite figures.
Start with these essential solid geometry calculators
Solid geometry adds a third dimension to plane geometry — every shape now has a volume in addition to surface area, and "diagonal" can refer to face diagonal or space diagonal. The calculators below cover the standard high-school catalogue: cube, rectangular prism (box), cylinder, sphere, cone, square / triangular / hexagonal pyramid, frustum (truncated cone or pyramid), torus, and ellipsoid. For each solid you get volume, total surface area, lateral surface area, and shape-specific extras (e.g. slant height for cones, space diagonal for boxes). Compound 3D figures — "cylinder on top of a cube" — are handled by the AI Geometry Solver under "AI Tools" using additive/subtractive decomposition.
This collection has 2 3d solid calculators: 1 are tagged Most Popular, 1 are supporting tools. The most-used tools include Cube and Rectangular Prism Calculator.