Instantly find volume, surface area, and diagonal of any cube
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Cube Formulas
Our free cube calculator computes volume, surface area, space diagonal, face diagonal, face area, and total edge perimeter from a single side length. Whether you're solving a geometry problem, estimating material quantities, or packing boxes, just enter the side length and choose your unit — results appear instantly with the full formula reference below.
Multiply the side length by itself three times: V = s³. For example, a cube with a 5 cm side has a volume of 125 cm³.
A cube has 6 identical square faces, so the total surface area is SA = 6s². A 5 cm cube has a surface area of 150 cm².
The space diagonal runs from one corner to the opposite corner through the interior of the cube. Its length is d = s√3 (approximately 1.732 × s).
The face diagonal crosses one square face (fd = s√2 ≈ 1.414 × s), while the space diagonal passes through the cube's interior connecting two opposite vertices (d = s√3 ≈ 1.732 × s).