Container Load Calculator — 20ft & 40ft

Container Load Calculator — 20ft & 40ft
Calculator

Container Load Calculator — 20ft & 40ft

Enter your carton or pallet dimensions below to calculate how many units fit in a standard 20ft or 40ft shipping container and your projected container utilisation.

 Calculation Results

Results are based on theoretical maximum utilisation (90% loading efficiency factor applied). Actual capacity depends on cargo orientation, loading method, and weight limits. Contact Marwest LLC for a professional loading plan.

How It Works

Understanding the Calculation

Container Internal Dimensions

20ft container: 5.9m L × 2.35m W × 2.39m H, approx 25 CBM usable. 40ft container: 12.0m L × 2.35m W × 2.39m H, approx 58 CBM usable. 40ft HC: 12.0m L × 2.35m W × 2.69m H, approx 67 CBM usable.

Weight vs Volume

Containers have both a volume limit and a payload weight limit. A 20ft container's maximum payload is ~21,700 kg. A 40ft has ~26,500 kg. Dense cargo (metal parts, tyres) may hit the weight limit before the volume limit.

Loading Efficiency

Theoretical maximum container fill is rarely achievable in practice. Irregular carton stacking, structural bracing, and access requirements typically result in 85–92% of theoretical capacity. Our 90% efficiency factor reflects this.

Frequently Asked Questions

Questions About This Calculator

Yes. Our operations team creates a professional container loading plan (CLP) that optimises the mix of different carton sizes to maximise container utilisation. Request a CLP from our team for complex shipments.

The maximum payload (cargo weight) for a standard 40ft dry container is approximately 26,500 kg. The total gross weight (container tare + cargo) must not exceed the container's maximum gross weight, typically 30,480 kg.

A 40ft container is more cost-efficient per CBM than two 20ft containers. Use a 20ft if your cargo volume is under 18 CBM or if you need a second container at a later date. For 18–28 CBM, a 40ft container is usually the better choice.

LCL (Less than Container Load) consolidates multiple shippers' cargo in a single container. You share the container cost with other shippers, paying per CBM. FCL (Full Container Load) gives you the entire container to yourself — recommended for volumes over 15 CBM.
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Our freight specialists are ready to turn your questions into a concrete shipping plan. Contact Marwest LLC for a free consultation tailored to your cargo and destination.