Rectangular Prism Volume Calculator
Enter a box's length, width, and height to calculate its volume, using V = l × w × h.
Last updated: September 5, 2026
Frequently asked questions
What's the formula for the volume of a rectangular prism?
V = l × w × h - multiply the length, width, and height together. A box that's 5 × 4 × 3 units has a volume of 60 cubic units.
Is a rectangular prism the same as a cuboid or a box?
Yes - "rectangular prism," "cuboid," and "box" (or "rectangular box") all describe the same 3D shape: six rectangular faces meeting at right angles. This calculator works for any of them, whichever term you use.
How is a rectangular prism different from a cube?
A cube is a special case of a rectangular prism where all three dimensions are equal (l = w = h). Every cube is a rectangular prism, but most rectangular prisms aren't cubes, since their length, width, and height differ.
What's the formula for the surface area of a rectangular prism?
SA = 2(lw + lh + wh) - it adds up the areas of all six rectangular faces (two of each of the three unique face pairs) and doubles the sum since each face has an identical opposite face.
What's the surface area of a 5 × 4 × 3 box?
94 - SA = 2×(5×4 + 5×3 + 4×3) = 2×(20 + 15 + 12) = 2×47 = 94 square units.
Do the units for volume and surface area differ?
Yes - volume is measured in cubic units (like cm³ or ft³) since it multiplies three length dimensions together, while surface area is measured in square units (like cm² or ft²) since each face is a two-dimensional area.