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Results
Enter your dimensions above and the results appear here.
About the Cube Calculator
The cube calculator is a free online tool: volume, surface area and diagonals. Enter edge length (a) and the results update instantly, alongside a labelled diagram so you always know which measurement goes where.
Choose your input unit (mm, cm, m, km, in, ft or yd) and optionally show the results in a different one: lengths, areas and volumes are converted correctly. Every answer shows the formula behind it, and the calculation runs in your browser, so nothing is uploaded.
Cube Calculator example
Edge length (a) = 4 cmVolume = 64 cm³
Total surface area = 96 cm²
Lateral surface area = 64 cm²
Face diagonal = 5.6569 cm
Space diagonal = 6.9282 cm
Inscribed sphere radius = 2 cmHow to use the Cube Calculator
- Pick the unit your measurements use. All dimensions must share the same unit.
- Enter edge length (a). Focus a field to highlight the matching label on the diagram.
- Read the results as you type. The largest card is the main answer; the others are the related measurements.
- Copy a single value, copy everything, or share a link that keeps your inputs.
Cube Calculator FAQ
What formulas does the cube calculator use?
V = a³; SA = 6a²; Face diagonal = a√2; Space diagonal = a√3.
Can I use different units?
Yes. Pick the input unit and, if you like, a different output unit. Area results are shown in squared units and volumes in cubed units.
Is this cube calculator free and private?
Yes. It is free with no sign-up, and calculations happen on your device, so your numbers are never sent to a server.
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