Cube Calculator: Find Volume, Surface Area, and Diagonal

Your details

Select which cube property you already know. The calculator then solves all others.
The length of one edge of the cube.
cm
Side length (a)
5

Length of one edge

Volume (V)125
Surface area (S)150
Face diagonal (f)7.0711
Space diagonal (d)8.6603

A cube with side 5.0000 encloses 125.0000 in volume across 150.0000 of surface.

  • The face diagonal (7.0711) is 1.4142 times the side length because each face is a square.
  • The space diagonal (8.6603) is sqrt(3) times the side - it is the longest straight line you can draw inside the cube.
  • Volume-to-surface ratio: 0.8333 - larger cubes are more efficient at enclosing volume per unit of surface area.
  • A cube has the smallest surface area of any rectangular box with the same volume - the cube is the most efficient rectangular container.

Next stepUse the Surface area, Volume, or Diagonal reverse-solve modes above to work backwards from a measurement you already have.

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