📐 Surface Area Calculator
Calculate surface area for 3D shapes
About Surface Area
Surface area is the total area of all surfaces of a 3D object.
Surface Area Formulas
- Cube: SA = 6s²
- Sphere: SA = 4πr²
- Cylinder: SA = 2πr(r + h)
- Cone: SA = πr(r + l) where l is slant height
- Rectangular Prism: SA = 2(lw + lh + wh)
Frequently Asked Questions
What is surface area used for?
Calculating paint needed, material costs, heat transfer, and packaging requirements.
Difference between surface area and volume?
Surface area measures the outside (2D), volume measures the inside space (3D).