How to use the Box / Rectangular Cubic Feet Calculator
- Use external dimensions for shipping space and interior dimensions for container capacity. Measure each axis at a right angle.
- Choose the shape mode, where available, and a unit for each dimension. Enter the number of identical objects.
- Select Calculate. Review the result and its working; if you change an input, calculate again before copying or sharing.
Box / Rectangular formula
Convert each length to feet, apply the displayed solid-volume formula, then multiply by the number of identical objects.
L × W × H
What the terms mean
- Length
- A measured length in the selected unit; it is converted to feet before volume is calculated.
- Width
- A measured length in the selected unit; it is converted to feet before volume is calculated.
- Height / depth
- A measured length in the selected unit; it is converted to feet before volume is calculated.
- Number of identical items
- The whole-number count of objects with the same entered dimensions.
Box / Rectangular worked examples
Measure a rectangular box
A rectangular box is 4 ft long, 3 ft wide and 2 ft high.
- L × W × H
- length = 4 ft
- width = 3 ft
- height = 2 ft
- 24 ft³ × 1 = 24 ft³
Answer: 24 ft³. Cubic yards: 0.888889 yd³; Litres: 679.604318 L.
Add two matching boxes measured in inches
Two boxes each measure 24 in × 18 in × 12 in. Find their combined volume.
- L × W × H
- length = 2 ft
- width = 1.5 ft
- height = 1 ft
- 3 ft³ × 2 = 6 ft³
Answer: 6 ft³. Cubic yards: 0.222222 yd³; Litres: 169.90108 L.
Box / Rectangular Cubic Feet Calculator FAQs
Does this also work for a cube?
Yes. Enter the same dimension for length, width and height.
How do I add boxes with different sizes?
The quantity field is for identical boxes. Use the moving calculator to add separate rows for different sizes.
Measurement guide for Box / Rectangular
For container capacity, measure inside the walls. For a shipping envelope, measure the outside extremities, including projections.
Assumptions and limits
A box envelope includes empty corners around an irregular object. For differently sized items, use the moving or irregular-shape calculator.
Check your result
Check the dimensions converted to feet in the working. For similar solids, doubling every dimension increases volume by a factor of eight.