CBM Calculator

CBM Calculator

Calculate cubic meters (CBM) from carton dimensions and estimate 20ft or 40ft container loading.

CBM (cubic meters) = L × W × H ÷ 1,000,000 (in cm). Standard usable capacity: ~33 CBM (20ft) and ~67 CBM (40ft) — actual load varies by cargo type.

About this tool

The CBM Calculator converts box length, width and height (cm or inches) into cubic meters — the standard measure for ocean freight and container loading. Enter dimensions and quantity to get total shipment CBM and a rough estimate of how your volume compares to a 20ft (~33 CBM) or 40ft (~67 CBM) container. Built for exporters, importers and freight forwarders planning FCL or LCL shipments.

How to use the CBM Calculator

  1. 1

    Enter carton dimensions

    Length, width and height in cm or inches.

  2. 2

    Set quantity

    Number of boxes or cartons in the shipment.

  3. 3

    Read CBM and container estimate

    Get total CBM and 20ft/40ft comparison.

Frequently Asked Questions

How is CBM calculated?

CBM = (Length × Width × Height in cm) ÷ 1,000,000. Multiply by the number of cartons for total volume.

How many CBM fit in a 20ft container?

A 20ft container holds roughly 33 CBM usable space; 40ft holds about 67 CBM — actual load depends on cargo type and weight limits.

Can I use inches?

Yes. Switch to inches and the calculator converts internally.

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