Cubic feet calculator
Add each piece's size and quantity and this page totals the volume in cubic feet and cubic inches. Sellers use the same math for case cube: one case's cubic feet, printed on the carton or worked out here. Add a total weight and the page figures the density and hands the numbers to the freight class calculator.
Your pieces
Case cube, folded in
Case cube is a single case's volume in cubic feet, the number warehouses print on master cartons and use to plan shelf and pallet space. It is the first line of this calculator: enter one case at quantity 1 and read its cubic feet from the breakdown. A case that measures 16 × 12 × 10 in has a cube of 1.11 ft³. Ten of them are 11.11 ft³, and at 25 lb each their density is 22.5 lb/ft³, which the class chart puts at class 65.
Questions
How do I calculate cubic feet?
Multiply length × width × height in inches and divide by 1,728. A 16 × 12 × 10 in case is 1,920 in³, which is 1.11 ft³. This page adds up as many different pieces as you enter.
What is the difference between cubic feet and CBM?
Both measure volume. Cubic feet are used in US domestic shipping; CBM (cubic meters) are used in international shipping. 1 m³ is about 35.31 ft³. The metric version of this tool is the CBM calculator.
Why does cubic feet matter for freight?
Cubic feet are the denominator of density. Divide a shipment's weight by its cubic feet and you get the density that sets its freight class. This page hands its totals to the freight class calculator.
Sources
- Standard conversion: 1 ft³ = 1,728 in³
- NMFC Item 110 (density method, for the hand-off)
Rules last checked November 12, 2026 · How we check every figure