Rectangular Box Volume Calculator
Find the volume of any rectangular box or cuboid. Enter length, width, and height to calculate volume in cubic units quickly and accurately.
How to use this tool
- Enter length, width and height in the fields above.
- Results update instantly as you type โ or click Calculate.
- Read your volume and the full breakdown beneath it.
Formula
V = l x w x h
How it works
Multiply length, width, and height together: V = l ร w ร h.
Worked example
Box 5 x 3 x 2
- l = 5, w = 3, h = 2
- V = 5 x 3 x 2
- V = 30
Volume = 30 cubic units
Common mistakes to avoid
- Adding the dimensions (l + w + h) instead of multiplying them (l x w x h).
- Mixing units between dimensions (e.g. length in feet, height in inches) without converting to a single unit first.
- Confusing volume (cubic units, interior space) with surface area (square units, exterior faces); they require different formulas.
Key terms
- What is a cuboid?
- A cuboid (rectangular box) is a 3D shape with six rectangular faces and all angles at 90 degrees.
- Is a cube a cuboid?
- Yes, a cube is a special cuboid where all sides are equal.
Frequently asked questions
- How do I find the surface area of a rectangular box?
- Surface Area = 2 x (l*w + l*h + w*h). This calculator returns volume only.
- How many gallons fit in a rectangular tank?
- Compute volume in cubic inches (all measurements in inches), then divide by 231 (cubic inches per US gallon).
- What is the difference between a rectangular box and a rectangular prism?
- They are the same shape. Rectangular prism is the geometric term; rectangular box is the everyday term. Both use V = l x w x h.