Rectangular Prism Surface Area Calculator
Calculate total surface area of a rectangular prism.
How to Use the Rectangular Prism Surface Area Calculator
Enter length, width and height to calculate the total area of all six faces.
Practical Example
A box measuring 8 × 5 × 3 has total surface area of 158 square units.
Factors That Affect the Result
All dimensions must use the same unit. Surface area measures exterior covering, not internal capacity.
Frequently Asked Questions
Does this include all six faces?
Yes.
Is this the same as volume?
No. Volume measures internal space.
What units are returned?
Squared units.
Related Tools
- Prism Volume Calculator
- Cube Surface Area Calculator
- Triangular Prism Surface Area Calculator
- Surface Area Calculator
- Volume Calculator
Rectangular Prism Surface Area
A rectangular prism has three pairs of equal rectangular faces. Total surface area is 2(lw + lh + wh). This is different from volume, which is l × w × h.
The surface-area result is useful for wrapping, coating, packaging and sheet-material estimates. Use consistent dimensions and subtract faces that are open or not being covered. If seams, overlaps or trimming are required, add those allowances after calculating the ideal exposed area.