Surface Area Calculator
Calculate the surface area of common 3D shapes — cube, sphere, cylinder, and cone.
Supports unit conversion.
Surface Area
Surface Area is the total area covering the outside of a 3D shape.
Cube: SA = 6a² (a = side length)
Sphere: SA = 4πr² (r = radius)
Cylinder: SA = 2πr² + 2πrh (r = radius, h = height)
- Two circular caps + rectangular side
Cone: SA = πr² + πr × √(r² + h²) (r = radius, h = height)
- Circular base + slanted side
Unit conversions:
- 1 m² = 10.764 ft²
- 1 ft² = 144 in²
- 1 m² = 10,000 cm²