Container Load Plan: How to Plan, Calculate & Optimise Container Loading
Container load plan guide — how to calculate container utilisation, build a stuffing plan for 20ft and 40ft containers, avoid the most costly loading errors, and use a free container loading calculator to maximise every shipment.
A container load plan is the difference between 65% utilisation and 92% utilisation on the same cargo. At $3,000–$8,000 per container, every percentage point of wasted space has a dollar value. This guide covers how to build a container stuffing plan, calculate utilisation, choose between 20ft and 40ft containers, and use free container loading software to optimise before the cargo goes to the dock.
⚡ Container utilisation formula
Example: 28 CBM cargo in a 40ft GP (67.7 CBM)
Utilisation = (28 ÷ 67.7) × 100 = 41.4% → should split into a 20ft instead
What Is a Container Load Plan and Why It Matters
A container load plan — also called a container stuffing plan, container loading plan, or cargo load plan — is a structured layout showing how cargo will be arranged inside a shipping container before the stuffing team loads it. It specifies placement order, weight distribution, tier heights, and the resulting utilisation percentage.
Without a container load plan, stuffing teams make decisions on the dock under time pressure — which leads to poor weight distribution, wasted air space, and cargo damage from improper stacking. A 10% improvement in container utilisation on a $5,000 FCL shipment is $500 back in your pocket, every shipment.
Container load planning software — including free online container loading calculators — automates this process. You enter your cargo dimensions and quantities, and the software returns an optimised 3D cargo load plan with utilisation percentage and loading sequence.
Step-by-Step: How to Build a Container Stuffing Plan
Container Pallet Capacity — 20ft vs 40ft vs 40ft HC
| Container | Floor pallets (48×40) | Double stack | CBM | Max payload |
|---|---|---|---|---|
| 20ft GP | 10–11 | 20–22 | 33.2 | 21,770 kg |
| 40ft GP | 20–21 | 40–42 | 67.7 | 26,750 kg |
| 40ft HC | 20–21 | 40–42 | 76.3 | 26,460 kg |
| 20ft HC | 10–11 | 20–22 | 37.3 | 21,650 kg |
Floor pallet count based on 48×40 GMA pallets. Double stack assumes cargo height ≤42" per layer. CBM figures are internal usable volume. Payload = max gross weight minus tare weight.
When to Use a 20ft vs 40ft Container
The container fill calculation is the key decision point. Run total cargo CBM against both container sizes using the container utilisation formula above — or use the free container load planner which calculates this instantly.
| Cargo volume | Recommended | Reason |
|---|---|---|
| < 15 CBM | LCL | Less than container load consolidation is cheaper below ~15 CBM in most trade lanes |
| 15–33 CBM | 20ft GP | Fills a 20ft at 45–100% utilisation — FCL is cost-effective at this volume |
| 33–55 CBM | 40ft GP | Too much for a 20ft, fills a 40ft GP at 49–81% — acceptable utilisation |
| 55–76 CBM | 40ft HC | High Cube adds 8.5 CBM vs GP — better utilisation for tall or bulky cargo |
| > 76 CBM | Multiple | Two containers or specialised equipment (flat rack, open top) depending on cargo type |
The 5 Most Expensive Container Loading Mistakes
- Choosing the wrong container size without running a container fill calculation. Shipping a 20 CBM load in a 40ft container because "it might fit more later" is a common and expensive error. A 20ft container on most Asia-US trades costs roughly half a 40ft — use the right size for the load.
- Ignoring vertical space. Most cargo load plans fail by thinking in two dimensions. A 20ft container with 94 inches of height and 48-inch pallets has 46 inches of unused vertical space per row — enough for a second layer on most carton loads. Container loading optimisation software calculates this automatically.
- No loading sequence in the stuffing plan. A container stuffing plan without a sequence forces warehouse staff to make decisions on the dock. Heavy items loaded last sit on top of light ones. Mixed cargo types end up against wrong walls. The container loading program must output a loading sequence, not just a layout diagram.
- Exceeding floor load limits. ISO container floors are rated at 2,700 kg/m². A single 1,000 kg pallet on a 48×40 inch (1.2×1.0 m) footprint = 833 kg/m² — within limits. But stacking two identical pallets doubles that to 1,667 kg/m². Stack three on a small footprint and you risk floor damage and cargo liability.
- Not accounting for cargo compatibility. Hazmat and foodstuffs can't share a container. Moisture-sensitive cargo next to fresh produce causes condensation damage. Heavy machinery against fragile glassware causes vibration damage in transit. A container load plan should flag incompatible cargo types before stuffing begins.
Container Utilisation Benchmarks by Cargo Type
| Cargo type | Typical utilisation | Weight or volume limited? | Optimisation tip |
|---|---|---|---|
| Consumer goods (cartons) | 85–92% | Volume | Optimise Ti Hi, fill vertical space |
| Heavy machinery / steel | 40–65% | Weight | Hit weight limit before volume — use flat rack or open top if oversize |
| Furniture / large items | 55–75% | Volume | Knock-down flat packing increases utilisation significantly |
| Apparel / soft goods | 80–90% | Volume | Compression bags and tight carton packing maximise density |
| Automotive parts | 60–80% | Mixed | Custom racks and dunnage bags improve density and protection |
| Food & beverage (pallets) | 88–95% | Weight | Dense product often hits max gross weight before volume — 20ft preferred |
Free Container Loading Calculator vs Paid Software
Paid container loading optimisation software like CargoWise, Descartes, and Cargo Planner Pro costs $200–$2,000/month and is designed for high-volume freight forwarders managing hundreds of containers. For most importers, exporters, and 3PLs handling 1–50 containers per month, a free online container loading calculator does the same job.
What the free CargoTools container load planner does:
- Calculates container utilisation for 20ft GP, 40ft GP, and 40ft HC
- Outputs pallet count, CBM used, and utilisation percentage
- Handles mixed cargo with different dimensions
- Generates a visual container stuffing plan you can share with your warehouse team
- Compares 20ft vs 40ft automatically so you can choose the right container size
- No signup, no download, no trial — runs in your browser
For teams doing container load plan templates in Excel — a container loading calculator is faster and more accurate. Excel templates require manual updates for every cargo change; a browser-based container loading program recalculates in real time.
Free Container Load Planner
Enter cargo dimensions and quantities — get container utilisation, pallet count, and a visual loading plan for 20ft and 40ft containers instantly.
Open Free Container Load Planner →Frequently Asked Questions
What is a container load plan?
A container load plan (also called container stuffing plan or container loading plan) specifies how cargo is arranged inside a shipping container — placement, loading sequence, weight distribution, and utilisation percentage. It's the blueprint the stuffing team follows at the warehouse before the container is sealed and shipped.
How do I calculate container utilisation?
Utilisation (%) = (Total cargo CBM ÷ Container usable CBM) × 100. Target 85–90%. A 20ft GP has 33.2 CBM usable; a 40ft GP has 67.7 CBM; a 40ft HC has 76.3 CBM. Use the free container load planner to calculate automatically.
How many pallets fit in a 20ft container?
A 20ft GP container fits 10–11 standard 48×40 pallets floor-loaded. Internal dimensions are approximately 239"×92"×94". Double stacking where cargo height allows doubles the pallet count to 20–22.
How many pallets fit in a 40ft container?
A 40ft GP container fits 20–21 standard 48×40 pallets floor-loaded. A 40ft HC has the same floor space with 110" interior height instead of 94", making double stacking easier for taller loads.
What is the maximum weight for a 20ft container?
The maximum payload for a 20ft GP is approximately 21,770 kg (48,000 lbs). The container tare weight is around 2,230 kg, for a max gross of 24,000 kg. Always verify the CSC plate on the specific container unit and confirm road weight limits with your haulier.
What is a container stuffing plan?
A container stuffing plan is another term for a container load plan — it shows how cargo will be physically loaded into the container. The word "stuffing" is common in ocean freight forwarding, particularly for LCL consolidations. A complete stuffing plan includes cargo placement, loading sequence, weight distribution, and utilisation percentage.