Guide · Decide
Calculating a load is not validating it.
A load calculator tells you how much fits and how to place it. A load validator goes further: it checks that the load meets the rules of its transport (VGM, stowage, axle loads, IATA) and tells you what to fix before it ships.
What a load calculator does
A load calculator answers a question about space: how many packages fit in a container or a truck, and how to place them. From the dimensions and quantity of each package, it suggests a layout, often in 2D or 3D, and tells you the volume the load takes up and how many units of equipment you need.
It is very useful for quoting, comparing equipment and preparing the plan for the loading dock.
What validation adds
Validating means checking that the load not only fits, but can also ship that way under the rules of its transport.
- Weight: the VGM required by SOLAS, the payload of the equipment, and the truck’s maximum authorised weight and axle loads.
- Stowage and securing: that the load is well distributed and secured, in line with the CTU Code and EN 12195-1.
- Air: the chargeable weight, the greater of the actual and the volumetric weight.
The result is a clear verdict (Validated, Validated with warnings or Not validated), with the reason for each warning and what to fix.
Calculator vs validator
In short, a calculator plans the space and a validator checks that the plan meets the rules.
| Calculator / 3D planner | Validator | |
|---|---|---|
| How much fits | Yes | Yes |
| Meets the rules | Usually not, or only the total weight | Yes: weight, stowage and securing, and chargeable weight |
| Verdict | No | Validated, Validated with warnings or Not validated |
| What to fix | No | Yes, with the reason for each warning |
When a calculator is enough
When what you need is space, not compliance:
- Light, uniform loads, well below the weight limits.
- Estimating how many units of equipment you need to quote a price.
- Loads you always repeat the same way and already know meet the rules.
When you need to validate
When a mistake costs money, time or safety:
- Heavy loads, close to the container’s payload or the truck’s maximum authorised weight.
- Trucks where it matters how the weight is spread across the axles.
- Mixed, stacked or multi-shipper loads, such as groupage (LCL).
- Before booking, so you do not find out at the terminal that the VGM does not add up.
- When the person who plans is not the person who loads, and the plan has to reach the dock clearly.
The rules, explained: VGM, EU truck weight limits, truck axle weights in Spain, CTU Code and air chargeable weight.
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