How do you find rectangular prism volume?
Multiply length × width × height.
Rectangular Prism Volume Calculator
Multiply length, width, and height to get a box’s volume.
Enter dimensions
Provide positive length, width, and height.
About this calculator
How to use Rectangular Prism Volume Calculator, plus the formulas and logic behind the results.
Tool description
A rectangular prism has six rectangular faces. Its volume is the product of three edge lengths meeting at a corner.
How to use
- Enter length, width, and height.
- Select Calculate.
- Read the volume.
- Optionally review surface area 2(lw+lh+wh).
Formulas & reference
V = l × w × h
Box tips
- 5×4×3 = 60
- A cube has l = w = h
- Volume units are length³
- Order of multiplication does not matter
Calculation logic
Multiplies the three dimensions after positivity checks and also reports total surface area for convenience.
Also called a cuboid or rectangular box.
Rectangular Prism Volume Calculator FAQ
Common questions about this calculator and how to use the results.
Is a cube included?
Yes—set all three edges equal.
Must edges be positive?
Yes.
Does orientation matter?
No. Any edge can be called height.
What about hollow boxes?
This formula is solid volume (capacity if open-top containers use interior dimensions).
Is surface area included?
This tool also shows total surface area as a secondary result.