Container Loading Calculator
Calculate how many cargo boxes or pallets can fit into standard 20ft, 40ft, 40ft High Cube, and 45ft High Cube ocean containers. Optimize your volumetric utilization rate (%), account for practical packing factors (air gaps, door fit, dunnage), and prevent overweight container rejections at loading ports.
- • 20' GP Max Payload / Vol: 21,700 kg | 33.2 CBM (Practical ~28 CBM)
- • 40' GP Max Payload / Vol: 26,500 kg | 67.7 CBM (Practical ~58 CBM)
- • 40' HC Max Payload / Vol: 26,580 kg | 76.4 CBM (Practical ~67 CBM)
- • Practical Loading Factor: Loose Cargo ~85–90% | Palletized ~75–82%
1. Container Equipment & Unit System
2. Cargo Package Specifications
Technical Container Loading & Cargo Optimization Guide
Maximizing container space efficiency requires balancing three core engineering metrics: cubic package volume ($L \times W \times H$), spatial packing geometry (avoiding internal wall gap waste), and highway/vessel gross payload weight limits.
Understanding Practical vs. Theoretical Loading Capacity
A standard 40ft High Cube container has a theoretical geometry of 76.4 CBM. However, because real cargo boxes are rigid and cannot deform to match corrugated container walls or door height thresholds, freight forwarders apply a **Stowage Factor (0.85 to 0.90)**. Attempting to calculate freight quotes based on 100% theoretical volume will lead to overflow cargo at port CFS warehouses.
Frequently Asked Questions
Q: Why can't I load 100% of a container's theoretical CBM capacity?
Real-world cargo loading involves empty space created by box geometry mismatch, pallet bases, container door clearances, wall corrugation gaps, and dunnage. Realistic maximum volumetric utilization ranges between 85% and 92% for hand-stacked loose cartons, and 75% to 82% for palletized goods.
Q: What happens if cargo volume is within container limit but weight exceeds max payload?
Container loading is limited by whichever constraint is hit first: volume (CBM limit) or weight (payload limit). Heavy commodities such as metal plates or machinery will reach the maximum payload weight long before filling the volumetric space.