How to Measure CBM

Knowing how to measure CBM correctly is the foundation of every freight quote, customs declaration and warehouse plan. Get one side wrong and you can lose hundreds of dollars on a single LCL booking or — worse — discover at the port that your cargo simply does not fit the container you booked. This guide walks through the exact process forwarders use, then links you straight into our free CBM calculator.

Step 1 — Measure the carton

Measure the outside length, width and height of one carton, including any bulges from tape, straps or corner protectors. Use a metal tape for accuracy — a soft fabric tape can stretch up to 3% and throw off your numbers. Centimetres and inches are both fine, but stay consistent within a single carton. If you are buying from a factory, ask for the master carton dimensions, not the inner box.

Step 2 — Convert to meters

• cm to m: divide by 100
• inches to m: divide by 39.37
• feet to m: divide by 3.2808
• yards to m: divide by 1.0936
• mm to m: divide by 1,000

Our shipping unit converter does this conversion in one tap, and the main CBM calculator handles the conversion automatically when you pick a unit.

Step 3 — Calculate volume per carton

Multiply Length × Width × Height (in meters) to get the volume of one carton in cubic meters. For example, a 0.60 × 0.40 × 0.30 m carton is 0.072 CBM. Detailed worked examples live in calculate CBM in cm, CBM in inches and CBM in feet.

Step 4 — Multiply by quantity

Multiply the per-carton volume by the total number of cartons in the shipment. That is your shipment volume in CBM and the number that appears on the bill of lading. Always round up to the next 0.001 CBM — that is how carriers round, so your invoice will match.

Step 5 — Compare with container capacity

Compare against the usable capacity of each container size: ~28 CBM (20ft), ~58 CBM (40ft), ~68 CBM (40HC), ~78 CBM (45HC). When you are close to the limit, run a fit check in our container capacity calculator — it accounts for stacking gaps and door clearance.

How to measure a pallet for CBM

For palletised LCL cargo, measure the whole pallet, not just the goods. Include the pallet base (typically 12–15 cm), the cargo stack, plus any wrap or top sheet. The standard Euro pallet footprint is 1.2 × 0.8 m and a US/GMA pallet is 1.219 × 1.016 m. Most LCL forwarders cap pallet height at 2.2 m for safe stacking inside the container. Plan the layout in our pallet calculator.

Pro tip — irregular cargo

For non-rectangular cargo (rolls of fabric, drums, machinery on skids), measure the smallest bounding box that fully contains the item. Carriers always bill the box, not the contents.

Common measuring mistakes

• Measuring the empty carton flat instead of assembled
• Forgetting the pallet height on LCL shipments
• Using outer carton size for one box and inner size for another
• Confusing length and width — always state the longest side first
• Ignoring volumetric weight on light, bulky cargo — see the volumetric weight calculator

Once your dimensions are clean, the rest is one click. Open the free CBM calculator and enter your numbers — totals, container fit and chargeable weight all update live.