Cube Surface Area Calculator
Enter the side length of a cube to instantly find its total surface area, individual face area, face perimeter and space diagonal — all from the single input s.
units
Total area of all 6 faces: SA = 6 × s²
SA
150- 1
One face area (s²)
5 × 5 = 25 - 2
Total surface area (6 faces)
6 × 25 = 150A cube has 6 identical square faces.
How does this calculator work?
The surface area of a cube is SA = 6s², where s is the side length. A cube has six equal square faces, each with area s², so multiply by 6. A 5-unit cube has a surface area of 150 square units. Enter any side length above to get the exact result.
Formula
How this is calculated
A cube has six identical square faces. The total surface area is simply the area of one face (s²) multiplied by six: SA = 6s². This is one of the most fundamental formulas in geometry and applies any time you need to know how much material covers the outside of a cube — paint, wrapping paper, sheet metal or packaging.
The calculator also shows the area of a single face (s²), the perimeter of one face (4s), and the space diagonal — the longest straight line through the cube, which runs from one corner to the opposite corner and has length s√3 (derived from applying the Pythagorean theorem twice: the face diagonal is s√2, and the space diagonal is √(s² + (s√2)²) = s√3).
All four results are in consistent units: if s is in centimetres, the surface area is in cm², the perimeter in cm, and the diagonal in cm. The formula holds for any positive real side length — the calculator returns no result for zero or negative inputs.
Frequently asked questions
The total surface area of a cube is SA = 6s², where s is the side length. A cube has six identical square faces, each with area s², so the total is 6 times that.
From the volume V, find the side length s = V^(1/3) (cube root), then apply SA = 6s². For example, if V = 27 cm³ then s = 3 cm and SA = 54 cm².
Face area is the area of a single square face of the cube (s²). Surface area is the sum of all six faces (6s²). The surface area is always six times the face area.
Also known as
TG we-Calculate Editorial Team. (2026). Cube Surface Area Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/cube-surface-area-calculator
TG we-Calculate Editorial Team. "Cube Surface Area Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/cube-surface-area-calculator.
TG we-Calculate Editorial Team, "Cube Surface Area Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/cube-surface-area-calculator
@misc{wecalculate_cube_surface_area_calculator, title = {Cube Surface Area Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/cube-surface-area-calculator}}, year = {2026}, note = {TG we-Calculate} }
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