How heavy can a container be on the road?
Container payload is not the road limit. What governs is the permitted gross weight of the truck combination: in Germany that typically leaves about 28 t for container plus cargo, in EU intermodal transport about 32 t — in the USA only about 21 t.
The maths: what the gross weight leaves for the container
A 20ft container may carry about 28 tonnes according to its CSC plate. The truck taking it to the terminal usually may not: from the permitted gross weight, first subtract tractor and container chassis, then the container tare — only the rest is cargo:
| Country / rule | Permitted gross | − vehicle (typical) | = container + cargo | of which cargo in a 40′ HC |
|---|---|---|---|---|
| Germany / EU · 40 t | 40,000 kg | 12,000 kg | 28,000 kg | ≈ 24,100 kg |
| EU intermodal · 44 t | 44,000 kg | 12,000 kg | 32,000 kg | ≈ 28,100 kg |
| United Kingdom · 44 t | 44,000 kg | 12,000 kg | 32,000 kg | ≈ 28,100 kg |
| Switzerland · 40 t | 40,000 kg | 12,000 kg | 28,000 kg | ≈ 24,100 kg |
| USA · 80,000 lbs | 36,300 kg | 15,400 kg | 20,900 kg | ≈ 17,000 kg |
The vehicle weights are worked examples — the same ones the 3D calculator and the payload page use. Real tractors and chassis vary by more than a tonne depending on spec; US vehicles are typically heavier, hence the larger deduction.
The intermodal exception: 44 tonnes on pre- and on-carriage
On intermodal pre- or on-carriage (to or from rail or ship), Germany and the EU allow 44 instead of 40 tonnes gross. That is four more tonnes of cargo — but only on the leg to the nearest suitable terminal, and the combined transport must be provable. Anyone who wants to use the full payload of a 20ft container in Europe practically always needs this exception.
The USA: the strictest of the common limits
US federal law allows 80,000 lbs (about 36.3 t) on Interstates — well below the European 40 or 44 tonnes, with heavier tractors at the same time. That typically leaves about 21 tonnes for container plus cargo, so only about 17 tonnes of cargo in a 40ft container. Individual states and special tri-axle chassis allow more, and overweight permits exist but cost time and money. A container that is legal on European roads can be over the limit the moment it lands in US drayage — something to know before packing, not at the terminal.
What does that mean in practice?
- Plan heavy cargo around the weakest leg of the route. If the shipment goes to the USA, the road limit there is the ceiling — not the container payload and not the German limit.
- Two 20ft boxes instead of one 40ft only helps to a point on the road: each container rides its own truck, but the same gross limit applies per truck.
- Check the weight early: in the 3D calculator, choose the pre-/on-carriage country under “Details” — the calculator compares cargo plus a typical container tare live against the road guide value and warns when a plan is under the payload but over the road limit.
Frequently asked questions
Who is liable for overweight on the road?
Not just the driver: the operator and the shipper can be held responsible too. Add fines, being ordered off the road, and insurance trouble in case of an accident.
Does the limit apply to rail as well?
No — rail wagons and route classes carry far more. That is exactly why intermodal transport is attractive for heavy containers: road only to the terminal, with the 44 t exception.
How do I know my rig's weight?
From the vehicle documents of tractor and chassis. The example values above do not replace those figures — they show the order of magnitude.
Choose the country under “Details” in the calculator — the weight bar gets the road limit as a second mark.