Container Loading Calculator
Enter carton dimensions, quantity and container type to estimate volume utilisation and how many cartons fit. Covers 20ft, 40ft Standard, 40ft High Cube and 45ft High Cube containers. Planning guidance only — actual loading depends on carton orientation, weight limits and stacking configuration.
Enter carton dimensions, quantity and select a container size to estimate volume utilisation and how many cartons fit. Covers 20ft, 40ft standard and High Cube containers. Planning guidance only — actual loading depends on orientation, weight limits and stacking configuration.
20ft Standard: 589 × 235 × 239 cm internal · max payload 28,200 kg
Formula
Carton CBM = L × W × H (cm) ÷ 1,000,000 | Volume Utilisation = Total Carton CBM ÷ Usable Container CBM × 100
Container loading estimates are based on volume utilisation — the percentage of usable container space occupied by the cargo. Usable volume is less than total internal volume, accounting for door clearance and packing inefficiency. Weight limits are independent and may be the binding constraint for dense cargo.
Worked Example
100 cartons at 60 × 40 × 30 cm in a 20ft standard container (28 m³ usable):
Carton CBM = 60 × 40 × 30 ÷ 1,000,000 = 0.072 m³
Total CBM = 0.072 × 100 = 7.200 m³
Volume utilisation = 7.200 ÷ 28 × 100 = 25.7%
Estimated cartons that fit (volume) = 28 ÷ 0.072 = 388 cartons
At 25.7% utilisation for 100 cartons, an LCL (Less than Container Load) shipment is almost certainly more cost-effective than booking a full 20ft container. The full container volume could theoretically hold 388 similar cartons. Compare LCL per-CBM rates against the FCL container rate to decide.
FAQ
Frequently Asked Questions
Use this in your workflow
Use container volume utilisation to decide between LCL and FCL, then use the Pallet CBM Calculator to refine total volume. Feed the result into the Landed Cost Calculator to allocate freight cost per unit. Browse all Free Business Calculators.
Worked example: 500 cartons in a 40ft HC container
A useful starting point before entering your own figures above.
| Item | Value |
|---|---|
| Carton dimensions (L × W × H) | 60 × 40 × 35 cm |
| Quantity | 500 cartons |
| Volume per carton (0.60 × 0.40 × 0.35) | 0.084 CBM |
| Total carton volume (500 × 0.084) | 42 CBM |
| Container type | 40ft High Cube |
| Usable volume (40ft HC, planning) | ~67 CBM |
| Volume utilisation (42 ÷ 67) | ~63% |
| Recommendation | FCL viable — room to add more cartons |
Interpretation: at 63% volume utilisation there is spare capacity. If you can fill the remaining ~25 CBM with additional stock, the per-unit freight cost drops further. If the business cannot fill the container, it may be worth comparing the FCL rate against an LCL quote for 42 CBM to find the cheaper option.
Limitations
This calculator estimates volume utilisation only — it does not account for carton orientation, stacking patterns, weight distribution, or practical loading access. Real loading efficiency is typically 70–85% of the theoretical maximum. Container payload weight limits (21,600 kg for 20ft; 26,760 kg for 40ft) must also be respected — weight limits are set by the shipping line and road transport regulations. Always confirm the load plan with your freight forwarder or packing team. These estimates are for planning purposes only.
When to use this calculator
- →Deciding whether to book LCL or FCL based on volume utilisation of a 20ft or 40ft container
- →Estimating how many production cartons can be shipped per container for planning purposes
- →Comparing 20ft vs 40ft vs High Cube container sizes for the same cargo volume
- →Providing a volume utilisation estimate to your freight forwarder as a starting point
Frequently asked questions
How does the container loading calculator work?
The calculator estimates volume utilisation by dividing total carton CBM by the container's usable volume. It also estimates how many cartons could theoretically fit based on volume alone, assuming perfect cubic packing. It does not account for carton orientation, stacking patterns, weight distribution or physical loading constraints.
What is the usable CBM of a 20ft container?
A 20ft standard container has approximately 33 CBM of internal volume, but effective usable volume is typically 25–28 CBM, accounting for door clearance and packing inefficiency. This calculator uses 28 CBM as the planning usable volume.
When is FCL better than LCL?
FCL generally becomes more cost-effective when a shipment exceeds 12–15 CBM in a 20ft container, or 25–28 CBM for a 40ft. FCL also provides faster transit, less cargo handling and lower damage risk. Always compare FCL vs LCL rates from your forwarder for the specific lane.
What is the maximum weight for a 20ft container?
A 20ft standard container has a typical maximum payload of 21,600–28,200 kg. A 40ft standard container typically carries up to 26,760 kg payload. Weight limits are set by the shipping line and road transport regulations — both must be respected.
What is a High Cube container?
A High Cube (HC) container is 30 cm taller than a standard container — 269 cm internal height versus 239 cm. This provides approximately 10–15% more volume per container length. The 40ft High Cube is the most commonly used container for general cargo in international trade.
Why is actual cargo loading different from the volume estimate?
This calculator assumes perfect cubic packing. In practice, cartons have fixed orientations, some cannot be stacked above height restrictions, and physical loading requires lanes for forklifts and strapping points. A practical loading efficiency of 70–85% of the theoretical maximum is common. This estimate is a planning guide, not a guaranteed load plan.