Calculate how many boxes or items fit in a shipping container. Optimize packing for 20ft, 40ft, and 40ft HC containers with weight and volume limits.
The Container Loading Calculator determines how many boxes, pallets, or items fit inside standard shipping containers. It accounts for container dimensions, weight limits, box sizes, and stacking constraints to give you accurate packing estimates for logistics and freight planning. The same load can be volume-limited in one configuration and weight-limited in another, so both limits matter. That makes it useful before you book freight or commit to a pallet pattern.
International shipping containers come in standard sizes — 20ft, 40ft, and 40ft High Cube — each with specific internal dimensions and weight capacities. Maximizing container utilization reduces shipping costs and environmental impact. Even a 5% improvement in packing efficiency can save thousands of dollars across regular shipments.
Enter your box dimensions and weight, select the container type, and the calculator determines the maximum number of boxes that fit. It considers all possible orientations, stacking limits, and the weight capacity of the container. The tool also calculates volume utilization percentage, weight utilization, and CBM (cubic meters) to help you optimize your shipping strategy.
Use this calculator when you need to know whether cargo fits before booking a container. It is useful for freight planning, palletized loads, and comparing volume constraints against weight limits. That helps you avoid paying for a container that cannot be filled efficiently and gives you a fast check on whether a load is realistically shippable.
Boxes per layer = floor(Container Length / Box Length) × floor(Container Width / Box Width). Layers = floor(Container Height / Box Height). Total by volume = Boxes per layer × Layers. Total by weight = floor(Container Max Payload / Box Weight). Actual capacity = min(by volume, by weight). CBM = L × W × H in meters.
Result: 896 boxes
A 40ft container (internal: 12.03 × 2.35 × 2.39 m) fits 20 × 5 = 100 boxes per layer, with 7 layers high = 700 by one orientation. Optimizing orientations yields 896 boxes. Weight check: 896 × 15 kg = 13,440 kg (under 26,680 kg limit).
The most common shipping containers in international trade are the 20-foot and 40-foot dry containers, standardized by ISO 668. The 40-foot High Cube, with an additional 30 cm of internal height, has become increasingly popular for light but bulky cargo. All containers have standard widths of approximately 2.35 meters internal, but height and length vary by type.
Understanding the difference between internal and external dimensions is crucial. Door openings are slightly smaller than the internal width due to the door frame. Floor boards add a few centimeters to the effective floor level. These tolerances matter when packing to millimeter precision.
Professional freight planners use several strategies to maximize container utilization. Mixing box sizes, using different orientations, and filling gaps with smaller items can push utilization from 80% to 90%+. Software solutions model millions of packing permutations, but even simple calculations like those in this tool can identify the best single-box arrangement.
The concept of "volume weight" or "dimensional weight" is important too. Carriers calculate both actual weight and dimensional weight (volume × a factor), charging whichever is higher. This means under-utilizing container volume can be as costly as under-utilizing weight capacity.
Container shipping rates vary widely by route and market conditions. Even a small improvement in utilization can reduce the number of containers you need, which is why load planning matters before freight is booked.
20ft: 5.90 × 2.35 × 2.39 m. 40ft: 12.03 × 2.35 × 2.39 m. 40ft HC: 12.03 × 2.35 × 2.69 m. Actual usable space may be slightly less due to corrugation and door frame.
CBM (Cubic Meters) is the standard unit for measuring freight volume. Shipping rates are often quoted per CBM. Your total CBM determines whether volume or weight is the controlling factor for freight costs.
20ft: ~21,770 kg payload. 40ft: ~26,680 kg payload. These are maximum net weights. Actual limits depend on the specific container, road weight limits, and carrier policies.
Yes. Standard wooden pallets weigh 20-25 kg each, and pallet dimensions (typically 1200×1000mm or 48×40 inches) affect how boxes can be arranged inside the container.
Well-optimized loads achieve 85-95% volume utilization. The remaining space accounts for air gaps between boxes, irregular shapes, and dimensional rounding. Below 80% suggests room for optimization.
Significantly. This calculator checks multiple orientations (rotating length, width, and height) and selects the arrangement that yields the highest number of boxes.