What Is CBM?
CBM means cubic meter. In shipping and logistics, it describes the volume occupied by packed cargo. One CBM is the volume of a cube measuring one meter long, one meter wide, and one meter high.
Cargo calculator
CBM Calculator
Calculate the total cubic volume of multiple cartons or cargo types. Enter packed outer dimensions, choose a unit, and add quantities to get shipment CBM and cubic feet.
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Measurement guide
Understanding CBM for shipping
Use these notes to verify the calculator output and avoid common measurement mistakes.
CBM Formula
Length × Width × Height × Quantity
Convert the dimensions to meters before multiplying. For multiple carton types, calculate each type separately and add the totals.
How to Calculate CBM
Measure the outer length, width, and height of the shipping carton or cargo package. Convert those dimensions to meters, multiply them together to get CBM per piece, then multiply by the number of identical pieces.
CBM Calculation Example
A carton measures 50 cm × 40 cm × 30 cm and there are 10 cartons. Converted to meters, the dimensions are 0.5 m × 0.4 m × 0.3 m. The volume is 0.06 CBM per carton. For 10 cartons, 0.06 × 10 = 0.60 CBM.
Why CBM Matters in Shipping
CBM helps describe how much space cargo occupies. It is useful when preparing sea-freight and air-freight information, planning warehouse space, estimating container use, and giving freight forwarders the shipment dimensions they need for a quotation.
CBM for Air Freight vs Sea Freight
CBM itself measures volume. For sea freight, volume is often central to LCL shipment planning and container use. For air freight, carriers and forwarders may convert dimensions into volumetric weight and compare that result with actual weight. The exact divisor and charging rule can vary by carrier and service, so CBM alone should not be treated as the final chargeable weight.
Common CBM Mistakes
- Mixing centimeters and meters without converting them correctly.
- Forgetting to multiply the per-piece volume by quantity.
- Measuring the product instead of the packed shipping carton.
- Ignoring packaging, padding, or pallet dimensions that increase the shipment size.
- Moving decimal places incorrectly during unit conversion.
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CBM Calculator FAQ
What does CBM mean?+
CBM means cubic meter. It is a unit of volume commonly used to describe the space cargo occupies.
How do I calculate CBM?+
Convert length, width, and height to meters, multiply them together, then multiply by the number of identical pieces.
How many cubic feet are in 1 CBM?+
One cubic meter equals approximately 35.3147 cubic feet.
How do I calculate CBM for multiple cartons?+
Calculate the CBM for each carton type separately, multiply by its quantity, then add the row totals together.
Does carton weight affect CBM?+
No. CBM measures volume only. Weight can still affect freight charges and carrier limits.
Is CBM used for air freight?+
Yes, volume is relevant to air freight, but airlines and forwarders may convert dimensions into volumetric weight and compare it with actual weight.
Is CBM used for sea freight?+
Yes. CBM is commonly used for sea-freight volume planning, especially for LCL shipments and container space estimates.
Should I measure the product or the shipping carton?+
Use the outer dimensions of the packed shipping carton or cargo package because that is the space the shipment actually occupies.