Container Loading Calculator
Find how many containers your cargo needs.
Results update as you type.
How it works
Booking the right number of shipping containers is a balance between not paying for empty space and not leaving cargo behind. This container loading calculator takes your total cargo volume in cubic metres, compares it against the usable capacity of the container type you select, and returns how many containers you need along with how full they will be on average. This matters because containers are booked as whole units at a flat rate, so even a small overflow forces a second container that may sit mostly empty. Seeing the utilization percentage helps you decide whether to trim your order, consolidate shipments, or step up to a larger container type such as a high-cube to fit everything into fewer boxes and lower your cost per unit shipped. The calculation works because each container has a well-established usable volume, and dividing cargo CBM by that capacity then rounding up reflects the physical reality that partial containers still count as one. Note that these figures assume volume is the limiting factor; dense cargo may hit a container's weight limit first. Importers, exporters, and freight forwarders use container loading estimates to book capacity accurately, compare shipping options, and confirm a shipment will fit before committing to a rate.
containers = ⌈ cargo CBM ÷ container capacity ⌉
Each container type has a usable capacity in cubic metres: about 33 for a 20-foot, 67 for a 40-foot, and 76 for a 40-foot high-cube. Dividing your cargo volume by that capacity and rounding up gives the number of containers, since a fraction of a container still needs a whole one. Utilization is the cargo volume divided by the total capacity booked, showing how efficiently you fill the space you pay for.
Source:Standard freight/logistics formula
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter cargo volume and container type.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Containers needed updates instantly as you type — no button to press.
Frequently asked questions
How much cargo fits in each container type?
This calculator uses usable capacities of about 33 cubic metres for a 20-foot standard container, 67 for a 40-foot standard, and 76 for a 40-foot high-cube. These are practical loading figures rather than the maximum internal volume, since boxes never stack perfectly. Choosing the right type for your cargo volume helps you minimise the number of containers and the empty space you end up paying to ship.
Why round up to a whole container?
Containers are booked and priced as complete units, so any cargo that exceeds one container's capacity requires a second, even if it only half-fills it. The calculator rounds up to reflect this, giving the true number you must reserve. The utilization figure then shows how full those containers are, which is your cue to consider consolidating or resizing to avoid shipping a nearly empty box.
What does the utilization percentage tell me?
Utilization is your cargo volume divided by the total capacity of the containers you book, shown as a percentage. A high figure means you are using the space efficiently, while a low figure warns that you are paying for a lot of empty room. If utilization is low, you might reduce your order, add more goods, or pick a container type that packs your cargo into fewer, fuller boxes.
Does this account for how items actually pack?
The calculator estimates based on total volume, which assumes cargo fills the container efficiently. In reality, box shapes, stacking rules, and irregular items leave gaps, so real capacity is often 80 to 90 percent of the theoretical figure. Treat the result as a planning estimate and build in a margin, especially for oddly shaped goods that will not stack neatly into the available cubic space.
What if my cargo is heavy rather than bulky?
This tool assumes volume limits your load, but dense cargo can hit a container's maximum payload before it fills the space. Each container has a weight limit, often around 28 tonnes for a 20-foot and slightly more for a 40-foot. If your goods are heavy, check the total weight against that limit too, and use whichever constraint requires more containers to stay legal and safe.