Cube Volume and Surface Area Calculator

About this calculator

Given only the edge length a of a cube, this calculator returns all four core measurements: volume = a³, total surface area = 6a² (six identical square faces), the face diagonal = a√2 (the diagonal across one square face, from the Pythagorean theorem), and the space diagonal = a√3 (the diagonal running corner-to-corner through the solid's interior).

Students use it to check geometry homework on 3D solids, and it comes up in practical contexts too — packaging designers computing how much material covers a cube-shaped box, and woodworkers or machinists checking whether a diagonal brace or dowel will fit through a cubic frame corner-to-corner.