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CBM & Dimensional Weight Calculator
Add your cartons to get the shipment volume in cubic metres and feet, the dimensional weight for your carrier's divisor, and the estimated billable weight.
An estimate of chargeable weight, not a shipping quote. Carriers may add minimum charges, oversize and surcharges, measure differently or round dimensions before calculating.
The formulas
- VolumeCBM = L(m) × W(m) × H(m) × quantity
- Dimensional weight (metric)kg = L(cm) × W(cm) × H(cm) ÷ divisor
- Dimensional weight (US)lb = L(in) × W(in) × H(in) ÷ divisor
Worked example
One 100 × 100 × 100 cm box is 1 m³; three are 3 m³. With a 5,000 divisor each box has a dimensional weight of 1,000,000 ÷ 5,000 = 200 kg, so a 50 kg box would be charged as 200 kg.
Frequently asked questions
How do I calculate CBM?+
Multiply length × width × height in metres, then by the number of cartons. A 100 × 100 × 100 cm box is 1 × 1 × 1 = 1 m³; three of them are 3 m³. For a 60 × 40 × 40 cm carton: 0.6 × 0.4 × 0.4 = 0.096 m³.
What is dimensional (volumetric) weight?+
A weight carriers charge for bulky, light parcels: length × width × height divided by a divisor. With centimetres and a 5,000 divisor, a 100 cm cube has a dimensional weight of 1,000,000 ÷ 5,000 = 200 kg. You're charged on whichever is higher — actual or dimensional weight.
Which divisor should I use?+
The one on your carrier's rate card for that service — commonly 5,000 or 6,000 cm³/kg, or 139 or 166 in³/lb. A cm³/kg divisor must be used with centimetres and an in³/lb divisor with inches; the calculator converts your dimensions to match automatically.
Per package or whole shipment?+
Parcel carriers usually compare actual and dimensional weight for each package. Freight and some multi-piece services compare the shipment's totals once. Pick the option that matches your service.
Is the billable weight my shipping price?+
No. It's the weight a carrier would likely charge on. Prices also depend on zones, minimum charges, surcharges and how the carrier measures and rounds.
Can I import a packing list?+
Yes — import a CSV with columns name, length, width, height, unit, quantity, weight and weight_unit. The file is read in your browser and isn't uploaded. Export gives the same columns plus the results.