➗ Rectangular Prism Surface Area Calculator
Calculate total surface area of a rectangular prism.
Result
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How this calculator works
Calculate total surface area of a rectangular prism.
Formula
SA=2(lw+lh+wh)
Example
Dimensions 8×5×3 give surface area 158.
Frequently asked questions
What does the Rectangular Prism Surface Area Calculator do?
Calculate total surface area of a rectangular prism.
Are the results exact?
The calculator follows the displayed formula. Rounded display values may differ slightly from full-precision results.
Can I use negative or decimal values?
Most fields accept decimals and negative values when they make sense for the formula.
How should I check an important result?
Review the formula, verify your entries, and confirm high-stakes work with a qualified teacher or professional.