Surface Area Calculator
Calculate the surface area of common 3D shapes.
Cube
Sphere
Cylinder
Cone
Surface Area
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Select shape and enter dimensions
Surface Area Formulas
| Shape | Formula | Notes |
|---|---|---|
| Cube | SA = 6s^2 | 6 square faces |
| Sphere | SA = 4 pi r^2 | Curved surface only |
| Cylinder | SA = 2 pi r^2 + 2 pi r h | Top + bottom + side |
| Cone | SA = pi r^2 + pi r s | Base + curved (s = slant) |
| Rectangular Prism | SA = 2(lw + lh + wh) | All 6 faces |
What is Surface Area?
Surface area is the total area of all surfaces (faces) of a 3D object. It's measured in square units like square meters (m2) or square feet (ft2).
Lateral vs Total Surface Area
Lateral surface area: Only the sides (not including top/bottom)
Total surface area: All surfaces including top and bottom