CBM Calculator for Shipping & Logistics

What is CBM and why does it matter?

CBM stands for Cubic Metre, the international standard for measuring the volume of a shipment. Every time you book ocean freight, your freight forwarder calculates the total CBM of your cargo to determine the cost, the number of containers required, and the space allocation within the vessel.

For LCL (Less than Container Load) shipments, ocean freight is quoted per CBM (or per tonne, whichever is higher). Knowing your exact CBM before requesting a quote allows you to compare rates accurately and avoid surprises at invoice time.

For FCL (Full Container Load) shipments, CBM helps you understand how efficiently you are utilising the container space. A 40HQ container offers approximately 68 usable CBM. If your cargo only fills 35 CBM, you are paying for a full container while using roughly half of it — a common inefficiency that better planning can reduce.

How to calculate CBM

The formula is straightforward: multiply the length, width, and height of one carton (converted to metres), then multiply by the total number of cartons.

CBM per carton = Length (m) × Width (m) × Height (m)
Total CBM = CBM per carton × Number of cartons

Example: a carton measuring 60 cm × 40 cm × 30 cm has a volume of 0.6 × 0.4 × 0.3 = 0.072 CBM. For a shipment of 500 cartons: 0.072 × 500 = 36 CBM total. That fills approximately 53% of a 40HQ container.

Container Capacity Reference

Standard usable volumes (note: gross capacity is higher, but practical loading capacity varies based on cargo density and stacking restrictions):

• 20' Box: real load capacity 25.6 m3
• 40' Box: real load capacity 52.0 m3
• 40' HC: real load capacity 60.5 m3

Based on LogiMind experience: real load capacity is approximately 80% of the internal volume. Each maritime company may have slightly different measurements.