How to Use a CBM Calculator for International Shipping from China
CBM — cubic meters — is the unit that determines how LCL sea freight shipments are priced, when an FCL container becomes more economical, and how carriers bill cargo that’s too light for weight-based calculations. If you’re importing from China, CBM shows up constantly: in freight quotes, packing list requirements, and container load planning. This guide explains the formula, how to calculate it accurately for different shipment types, and how to use it to make better freight decisions.
For up-to-date numbers on a specific lane while you read this guide, you can check current China to Nigeria air freight rates — pricing is refreshed live from the carrier feed.
The CBM Formula
In meters: CBM = Length (m) × Width (m) × Height (m)
In centimeters: CBM = L (cm) × W (cm) × H (cm) ÷ 1,000,000
| Carton Dimensions | CBM per Carton | 20 Cartons | 50 Cartons |
|---|---|---|---|
| 60 × 50 × 40 cm | 0.120 CBM | 2.4 CBM | 6.0 CBM |
| 40 × 30 × 30 cm | 0.036 CBM | 0.72 CBM | 1.8 CBM |
| 80 × 60 × 50 cm | 0.240 CBM | 4.8 CBM | 12.0 CBM |
| 35 × 28 × 22 cm | 0.022 CBM | 0.44 CBM | 1.1 CBM |
For shipments with mixed carton sizes, calculate CBM for each size separately and sum the totals. Always measure your packed export cartons, not the product dimensions — factory packaging adds meaningful volume.
How CBM Drives LCL Sea Freight Cost
Sea freight LCL (Less than Container Load) is priced by CBM. Carriers charge based on whichever generates more revenue: volume-based (CBM rate) or weight-based (KG rate, typically around $0.20–$0.30/KG for ocean). For most consumer goods shipments, volume-based billing applies — your cargo density is usually below the 1 ton/CBM threshold where weight billing overtakes volume billing.
Indicative LCL rates all-in landed (China to destination, 2026):
| Destination | Rate per CBM (all-in) | Min. charge |
|---|---|---|
| UK (Felixstowe) | $240–$420 | 1 CBM |
| Germany (Hamburg) | $185–$320 | 1 CBM |
| USA (Los Angeles) | $200–$380 | 1 CBM |
| Australia (Sydney/Melbourne) | $280–$480 | 1 CBM |
| Canada (Vancouver) | $200–$360 | 1 CBM |
| South Africa (Durban) | $220–$380 | 1 CBM |
The LCL vs FCL Tipping Point: How to Calculate It
The break-even CBM at which an FCL becomes cheaper per CBM than LCL:
FCL break-even CBM = FCL all-in cost ÷ LCL rate per CBM
Example — China to UK:
- LCL all-in rate: $380/CBM
- FCL 20-foot all-in (ocean + customs + delivery): $5,500
- Break-even: $5,500 ÷ $380 = 14.5 CBM
Below 14.5 CBM: LCL is cheaper. Above 14.5 CBM: FCL gives a lower per-CBM cost. Recalculate each shipment — rates shift seasonally and by route.
Container Capacities: What Fits
| Container Type | Internal Volume | Practical Cargo Capacity | Max Payload |
|---|---|---|---|
| 20-foot standard | 33.2 CBM | 25–28 CBM | ~28,000 KG |
| 40-foot standard | 67.7 CBM | 55–60 CBM | ~28,000 KG |
| 40-foot high cube | 76.4 CBM | 62–68 CBM | ~28,000 KG |
Practical capacity is lower than internal volume because cargo requires bracing and loading space. Heavy, dense cargo (metal parts, machinery) may hit the weight limit before the volume limit — verify both when planning FCL loads.
CBM and Amazon FBA Planning
Amazon FBA receiving limits are often expressed in cubic feet (US) or units per shipment rather than CBM. For reference: 1 CBM = 35.3 cubic feet. If your FBA shipment plan in Seller Central shows a cubic feet limit, divide by 35.3 to convert to CBM and verify against your calculated carton volume before booking freight.
Calculate your shipment’s CBM and get a current sea freight quote at our freight calculator.
Compare Air vs Sea on Real Lanes
For real-world pricing and country-specific guides, see the live rate pages below:
- How to choose between air and sea freight
- Air freight from China to Nigeria — live rates
- Sea freight from China to Nigeria — live rates
- Air freight from China to the USA — live rates
- Sea freight from China to the USA — live rates
- Air freight from China to the UK — live rates
FAQ
How do I calculate CBM for irregularly shaped items?
Use the dimensions of the bounding box — the smallest rectangular box that fully encloses the packed item. Carriers measure and bill based on the outer dimensions of the carton or packed item, regardless of the product’s internal shape.
Does CBM affect air freight pricing?
Indirectly, yes — through volumetric weight. Air freight volumetric weight = L × W × H (cm) ÷ 5,000. A 1 CBM shipment = 1,000,000 cm³ ÷ 5,000 = 200 KG volumetric weight. If actual weight is under 200 KG, you pay for 200 KG. CBM and volumetric weight are two expressions of the same concept applied to different freight modes.
What is the minimum CBM for LCL shipments?
Most freight providers charge a minimum equivalent to 1 CBM or a fixed minimum dollar charge per bill of lading. For very small volumes under 0.5 CBM, air freight total cost often competes with or beats LCL once all LCL surcharges (documentation, handling, customs, deconsolidation) are included.