Calculated result
Enter values and select Calculate.
Five solid formulas
Cube: 6a². Rectangular prism: 2(lw + lh + wh). Cylinder: 2πr² + 2πrh. Sphere: 4πr². Cone: πr² + πr√(r²+h²).
Ownership boundary
This page calculates 3D exterior surface area. Area Calculator retains 2D shapes, and Volume Calculator retains enclosed volume. It is not a paint, material, or cost estimator.
Worked example
The editable example above demonstrates the complete formula with visible assumptions. Select Calculate to inspect the resulting values.