Surface Area Calculator
Calculate the total surface area of common 3-D solids — cube, sphere, cylinder, cone or rectangular prism — with the formula, the base/lateral breakdown and full substitution steps shown for the shape you pick.
TheCalculators — Surface Area Calculator
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Cube surface area
96 units²
SA = 6a²
- Shape
- Cube
- Formula
- SA = 6a²
- 6 faces (a² each)
- 96 units²
- Total surface area
- 96 units²
Step-by-step solution
- 1Pick the formula for the shapeSA = 6a²
- 2SubstituteSA = 6 × 4² = 6 × 16 = 96 units²
Values are unit-agnostic: enter dimensions in cm, m, inches — the result is in the matching square units.
Most useful next
Formula
cube 6a² · sphere 4πr² · cylinder 2πr(r+h) · cone πr(r+√(r²+h²)) · prism 2(lw+lh+wh)
Pro tips
- • Open cylinders/tubes (no lids) use SA = 2πrh + πr² for one end, or just 2πrh for a pipe.
- • Cone slant height l = √(r² + h²) comes straight from Pythagoras.
- • Halving a sphere’s radius cuts its surface area to a quarter.
FAQ
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