Cuboid Calculator
Calculate volume, surface area and space diagonal of a rectangular cuboid.
Inputs
units
units
units
Volume
120.0000cu units
Total Surface Area
158.0000sq units
Space Diagonal
9.8995units
Step by step
Volume
V = 8 × 5 × 3
= 120
Surface area
SA = 2(8×5 + 8×3 + 5×3)
= 158
Space diagonal
d = √(8² + 5² + 3²)
= 9.8995
How it works
A cuboid (rectangular prism) has three pairs of rectangular faces. Volume = l×w×h, surface area = 2(lw + lh + wh), space diagonal = √(l²+w²+h²).
Formulas
Volume
V = l × w × h
- l
- Length
- w
- Width
- h
- Height
Surface Area
SA = 2(lw + lh + wh)
- l
- Length
- w
- Width
- h
- Height
Frequently Asked Questions
Is a cube a special cuboid?
Yes — a cube is a cuboid where all three dimensions are equal.
How do I find dimensions from volume alone?
You cannot — volume alone does not uniquely determine the three dimensions. You need at least two of the three.