Surface Area Calculator
Compute the surface area of a cube, rectangular prism, sphere, cylinder or cone.
Runs 100% in your browser — nothing is uploaded.
Result
Formula
Cube SA = 6a² · Prism SA = 2(lw+lh+wh) · Sphere SA = 4πr² · Cylinder SA = 2πr(r+h)
About this calculator
The Surface Area Calculator computes the total surface area of common three-dimensional geometric shapes, including cubes, rectangular prisms, spheres, cylinders, cones, and square pyramids. Given the necessary dimensions, it returns the surface area in square units, along with the volume and key dimensions for reference.
How to use
- 1
Select the shape from the Shape dropdown.
- 2
Enter the required dimensions (Edge, Length, Width, Height, or Radius) for the selected shape.
- 3
Read the calculated Surface area result.
Frequently asked questions
What is the difference between surface area and volume?
Surface area is the total area of the outer surface of a 3D object, measured in square units. Volume is the amount of space enclosed by the object, measured in cubic units. For example, a cube with side 2 has surface area 6×2²=24 square units and volume 2³=8 cubic units.
How do I find the slant height of a cone if I only know the radius and height?
Use the Pythagorean theorem: slant height l = √(r² + h²), where r is the radius and h is the perpendicular height. For example, if r=3 and h=4, then l = √(9+16)=√25=5.
Can this calculator handle units like inches or centimeters?
The calculator works with pure numbers. You must ensure all inputs are in the same unit system. The result will be in square units of that system (e.g., if you input inches, the surface area is in square inches).
Please note: Results are estimates for general information only and are not professional or medical/financial advice.