Freight Measurement·4 min read·Verified 2026-10-06

What Is CBM in Shipping: Definition, Uses, and Conversions

An introductory guide explaining the concept of Cubic Meters (CBM), why it is the primary volume metric in global logistics, and how to convert from other units.

Definition of CBM

CBM stands for Cubic Meter (m³). It is the metric measurement of volume equal to a cube with dimensions of 1 meter long, 1 meter wide, and 1 meter high (1 m × 1 m × 1 m). CBM is the universal measurement standard across international ocean shipping, air freight, and global forwarding.

Essential CBM Conversions

* 1 CBM = 35.3147 cubic feet (ft³) * 1 CBM = 61,023.7 cubic inches (in³) * 1 CBM = 1,000 liters * 1 CBM = 1,000,000 cubic centimeters (cm³)

How CBM Is Used Across Freight Modes

* Ocean FCL: Used to determine whether goods will fit inside 20ft (~33 CBM nominal), 40ft (~67 CBM), or 40ft High Cube (~76 CBM) containers. * Ocean LCL: Serves as the primary billing basis under the Weight or Measure (W/M) tariff, where 1 CBM equals 1 metric tonne. * Air Freight: Converted to volumetric weight at the standard IATA ratio of 1 CBM = 166.67 kg (6,000 cm³/kg).
Authoritative Basis

Standards & References

Freight forwarding / ocean tariff practiceVerified: 2026-10-06

Weight or Measure (W/M) and revenue ton ↗

LCL freight is commonly rated per revenue ton: the greater of cubic metres or metric tonnes.

Ocean container lines (reference: Maersk dry container specifications)Verified: 2026-10-06

Dry container reference specifications — 20 ft, 40 ft and 40 ft high cube ↗

Internal dimensions, door openings and approximate payloads were taken as representative planning figures. Carriers publish slightly different values per equipment type and manufacturer.

Interactive Calculators

Calculate This Topic

Freight MeasurementCBM Calculator →Calculate total shipment volume in cubic meters (CBM) and cubic feet across multiple cargo rows.PackagingBox Volume Calculator →Convert and calculate carton volume in litres, cubic meters, cubic feet, and cubic inches.Air & OceanLCL Freight Calculator →Calculate ocean LCL chargeable volume using the Weight or Measure (W/M) revenue ton principle.
Further Reading

Related Guides

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How to Calculate CBM →A practical guide showing exact formulas to calculate CBM from various measurement units, including multi-carton and multi-pallet export calculations.
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Air Freight Chargeable Weight →A comprehensive guide to air cargo chargeable weight calculations under standard IATA conventions, comparing airline freight against courier express services.