Enter a value to any field - the others are calculated themselves. If you change a value in any field, the others are automatically recalculated.
For decimals you can enter either points or commas
as decimal marks (but only one decimal point in a value).

a = m
u2 = m
u3 = m
O = m
P = m²
Q = m²
V = m³
to 6 digits

The result will be in the units that you enter into the fields.
For example: if you enter centimeters, calculation will be also in centimeters.

If appears an error NaN, check whether you enter to the field
a correct value, ie. without any letters and other characters.


(total length of edges)
O = 12 × a [m]
P = a × a = a² [m²]
Q = 6 × P1 = 6 × a² [m²]
V = a × a × a = a³ [m³]
u2 = a √2 ≈ a × 1,41 [m]
u3 = a √3 ≈ a × 1,73 [m]
Cube formula

a … length of one edge

u2 … face diagonal

u3 … space/volume diagonal

S … center of cube

o … axis

Cube and Sphere

Space/volume diagonal (u3) = diameter of circumscribed sphere
Length of side edge (a) = diameter of inscribed sphere

Calculation of cube online

Cube calculator


How to calculate ...

Bold shapes and objects are already in operation. The others contain only a formula.

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