CBM Calculator for Shipping

Calculate the cubic meter (CBM) volume of your shipment from carton dimensions and quantity, then compare actual vs. volumetric weight to see the chargeable weight your carrier will bill.

Quick Facts

Formula
CBM = (L × W × H in cm) ÷ 1,000,000 × quantity
Carriers bill chargeable weight, the greater of actual weight and volumetric weight.

Your Results

Calculated
Total CBM
-
L × W × H × quantity, in cubic meters
Total gross weight
-
Actual weight × quantity
Volumetric weight
-
Dimensional weight for the selected mode
Chargeable weight
-
Greater of gross vs. volumetric weight

Ready

Enter your carton dimensions, quantity, and weight, then press Calculate.

About the CBM Calculator for Shipping

CBM stands for cubic meter, the standard unit freight carriers use to measure how much space a shipment takes up. This calculator finds your shipment's total volume from carton dimensions and quantity, then compares it against the actual weight to show which figure a carrier will actually bill.

The formula

  • Volume per unit (CBM): Length × Width × Height, in centimeters, divided by 1,000,000 to convert cm³ to m³.
  • Total CBM: volume per unit × quantity of cartons or units.
  • Volumetric (dimensional) weight: total cubic centimeters divided by a carrier divisor — 1,000 for sea/LCL freight (1 CBM ≈ 1,000 kg), 6,000 for air freight, and roughly 5,000 for many courier/express services.
  • Chargeable weight: whichever is larger, the actual gross weight or the volumetric weight — this is what carriers use to price freight.

Reading your result

Light, bulky shipments (foam, textiles, empty containers) usually have a volumetric weight higher than their actual weight, so they get billed by volume. Dense, heavy shipments (machinery, metal parts) usually have an actual weight higher than their volumetric weight, so they get billed by weight. Whichever number is larger is the one that sets your freight cost.

Practical context

Carrier divisors vary by trade lane, contract, and service level, so treat the sea/air/courier figures here as standard industry defaults rather than a specific quote. Always confirm the exact divisor and any minimum chargeable weight with your freight forwarder or carrier before booking.

Frequently Asked Questions

What is CBM in shipping?
CBM (cubic meter) measures the volume a shipment occupies. It is calculated as Length × Width × Height, in meters, per unit, multiplied by the number of units. Ocean and air carriers use CBM alongside actual weight to price freight.
How is volumetric (dimensional) weight calculated?
Volumetric weight converts a shipment's size into an equivalent weight using a carrier divisor: total length × width × height in centimeters, divided by 1,000 for sea/LCL freight, 6,000 for air freight, or about 5,000 for many courier services, gives kilograms.
What is chargeable weight and why does it matter?
Carriers bill freight on chargeable weight, the greater of the actual gross weight and the volumetric weight. Light, bulky cargo is usually billed by volume, while dense, heavy cargo is billed by actual weight, so both figures matter before booking.
Why do sea, air, and courier freight use different divisors?
The divisors are standard industry conventions, not physical constants, and reflect each mode's typical cost structure. Sea/LCL freight uses 1,000, air freight commonly uses 6,000, and courier services often use around 5,000 — always confirm the exact figure in your carrier's contract.

Related calculators