What is the CBM to KG Calculator?
CBM is a volume, not a weight, so "CBM to kg" depends on the transport mode's volumetric factor: air freight 1 CBM = 167 kg, courier 200 kg, road 333 kg and sea 1,000 kg. The CBM to KG calculator converts your volume for each mode and compares it with the actual weight to show the chargeable weight.
Find your CBM first with the CBM Calculator; to calculate from carton dimensions directly use the Volumetric Weight Calculator.
How to use the CBM to KG Calculator
- Enter the shipment's CBM.
- Enter the actual gross weight.
- Read volumetric and chargeable weight for each mode.
Formula
Air: CBM × 167 · Courier: CBM × 200 · Road: CBM × 333 · Sea: CBM × 1,000
Example
A 3.5 CBM shipment weighing 450 kg: air volumetric is 584.5 kg, so air bills 584.5 kg; sea bills 3.5 W/M (3.5 CBM > 0.45 t).
Density matters
If your cargo weighs more than 167 kg per CBM, air freight bills its actual weight; if less, it bills volume. Light, bulky goods such as garments or furniture are usually charged by volume.
Related packaging and shipping tools
Packaging decisions are connected: the box size sets the volumetric weight, which sets the courier bill, and the carton size decides how many fit on a pallet or in a container. These related calculators help with the next step:
- Volumetric weight calculator: courier, air, sea and road.
- Dimensional weight calculator: DIM weight and chargeable weight.
- CBM calculator: cubic metres for a shipment.
- Shipping cost calculator: courier cost from your rate card.
- Freight cost calculator: air, LCL, FCL and road.
Frequently asked questions
How many kg is 1 CBM for air freight?
167 kg (1:6000).
How many kg is 1 CBM for courier?
200 kg (1:5000).
How many kg is 1 CBM for sea freight?
1,000 kg (1 tonne).
What is chargeable weight?
The higher of actual and volumetric weight.
Is the factor the same for all airlines?
Most use 1:6000, but check your forwarder's terms.
Is the CBM to KG Calculator free to use?
Yes. The CBM to KG Calculator on Custom Converter is completely free, with no sign-up, no daily limit and no watermark.
Does the CBM to KG Calculator work on mobile phones?
Yes. It is built mobile-first and works on Android phones, iPhones, tablets and computers in any modern browser, with no app to install.