Understanding CBM: How Cubic Metres Affect Your Shipping Costs

What Is CBM and Why Does It Matter?

CBM stands for Cubic Metres — the standard unit of volume measurement in international shipping. Your shipment's total CBM directly determines:

• LCL (Less than Container Load) costs — you're charged per CBM
• FCL (Full Container Load) utilisation — how efficiently you're using the container you're paying for
• Whether to choose LCL or FCL — the crossover point depends on your total volume

How to Calculate CBM

The formula is simple:

CBM = Length (m) × Width (m) × Height (m)

If your dimensions are in centimetres:

CBM = (Length × Width × Height) ÷ 1,000,000

Example

A carton measuring 60cm × 40cm × 35cm: (60 × 40 × 35) ÷ 1,000,000 = 0.084 CBM per carton

200 cartons: 0.084 × 200 = 16.8 CBM total

Use the calculator below to work this out for your own shipment.

Container Capacities

In practice, you'll fit about 80–90% of the theoretical capacity due to how cartons stack and space is used.

LCL vs FCL: When to Choose Each

LCL (Less than Container Load)

Your goods share container space with other shippers. You pay per CBM.

• Typical LCL rate: $40–120 per CBM (depending on route)
• Best for: Shipments under 15 CBM
• Minimum charge: Usually 1 CBM

FCL (Full Container Load)

You rent the entire container. You pay a flat rate regardless of how full it is.

• Typical 20ft rate: $1,200–3,500 (depending on route and season)
• Best for: Shipments over 15 CBM (20ft) or 30 CBM (40ft)

The Crossover Point

LCL becomes more expensive than FCL when:

LCL rate × CBM > FCL container rate

Example: If LCL costs $80/CBM and a 20ft container costs $2,000: $2,000 ÷ $80 = 25 CBM crossover

At 25+ CBM, a full 20ft container is cheaper than LCL. But your shipment may only need 20 CBM — meaning you're paying for space you don't use.

The sweet spot: ship LCL until your volumes justify FCL, then optimise container utilisation.

How CBM Affects Your Per-Unit Cost

Smaller packaging = lower CBM per unit = lower freight cost per unit. Here's the impact:

Example: 2,000 units of a consumer product

A modest 3cm reduction on each dimension saved $248 — 29% on freight costs. Multiply this across annual order volumes and the savings are substantial.

Tips for Reducing CBM

1. Work with your supplier — ask if carton dimensions can be reduced without compromising protection
2. Remove excess packaging — eliminate unnecessary void fill and padding
3. Flat-pack where possible — products assembled after arrival take less space
4. Use the container space calculator — see the 3D container visualiser to plan optimal loading
5. Stack efficiently — ensure cartons are designed to stack without wasting vertical space

Common CBM Mistakes

• Not checking CBM before ordering — freight costs should be estimated before you commit
• Oversized cartons — some suppliers use standard cartons that are much larger than needed
• Ignoring volumetric weight for air freight — air freight uses a different calculation (divide by 6,000 instead of 1,000,000)
• Forgetting pallet dimensions — palletised goods have additional CBM overhead

Track your shipment volumes and freight costs across every order in LandedCost.io to identify opportunities for optimisation.