Surface Area Calculator
How It Works
This surface area calculator uses established formulas to provide accurate results.
The basic rule:
- Cube: SA = 6s²
- Rectangular Prism: SA = 2(lw + wh + lh)
- Cylinder: SA = 2πrh + 2πr²
- Sphere: SA = 4πr²
Results are estimates. Consult a professional for critical decisions.
Frequently Asked Questions
What is surface area?
Surface area is the total area of all the surfaces (faces) of a three-dimensional shape. Imagine unfolding a box flat — the surface area is the total area of that flat shape (called a net).
How do you find the surface area of a rectangular prism?
Add the areas of all 6 faces: SA = 2(lw + wh + lh). A rectangular prism has 3 pairs of identical faces.
What is the difference between surface area and volume?
Surface area measures the total area of the outside surfaces (in square units), while volume measures the space inside (in cubic units). Think of wrapping paper (surface area) vs. filling a box (volume).
How do you find the surface area of a cylinder?
A cylinder has two circular bases and one rectangular side (when unrolled). SA = 2πrh (side) + 2πr² (two bases).