Cube Calculator

About this calculator

This calculator finds a cube's volume, V = a³, surface area, SA = 6·a², and space diagonal, d = a·√3, all from its single edge length a. The surface area formula sums the six identical square faces, while the space diagonal — the straight line from one corner through the interior to the opposite corner — comes from applying the Pythagorean theorem twice, first across a face and then through the cube's depth.

Packaging and shipping teams use these formulas to determine box volume for freight pricing and how much material a cube-shaped carton requires, 3D-printing hobbyists use them to estimate material and print time for cube-shaped models, and engineers use the space diagonal when checking whether an object fits diagonally through an opening. Geometry students working through solid-shape problems and anyone sizing a cube-shaped storage container or aquarium use this calculator to get exact figures from one measurement.