Rectangular Prism Calculator
Volume, surface area and diagonal of a box.
All measurements of a rectangular box (cuboid).
The math behind it
Volume = l × w × h. Surface area = 2(lw + lh + wh). Diagonal = √(l²+w²+h²).
Worked example
4×3×2 → volume 24, surface 52.
FAQ
Cube?
A prism with all sides equal — use the Cube calculator.