Container Weight Limits: Max Payload for 20ft, 40ft & High Cube

Quick answer: Standard 20ft, 40ft and 40ft High Cube containers all share a max gross weight of about 30,480 kg (67,200 lb) — the limit set by the ISO container itself. What differs is the payload (cargo you can actually load), because it’s the max gross minus the container’s own empty weight (tare):

Container	Max gross weight	Tare (empty)	Max payload
20ft standard	~30,480 kg (67,200 lb)	~2,200 kg	~28,200 kg (62,200 lb)
40ft standard	~30,480 kg (67,200 lb)	~3,750 kg	~26,700 kg (58,900 lb)
40ft High Cube	~30,480 kg (67,200 lb)	~3,900 kg	~26,500 kg (58,400 lb)

So the 20ft actually carries more weight than the 40ft — about 1.5 tonnes more — because it weighs less empty. (Exact figures vary by manufacturer and build; always read the plate on your specific container.)

Will your cargo weigh out or cube out? Enter your item weights and dimensions to see whether you hit the payload limit or the volume limit first, for each container — free, no signup.

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The four weights people mix up

• Max gross weight (MGW / max rating): the most the loaded container may ever weigh — cargo + the container itself. ~30,480 kg for standard ISO units.
• Tare weight: the empty container’s own weight (stamped on the doors).
• Payload (net / max cargo): MGW − tare. This is the number that matters when you’re loading.
• VGM (Verified Gross Mass): under the SOLAS rule, the shipper must declare the loaded container’s actual total weight before it’s loaded onto a vessel — payload + tare, verified. Getting this wrong can mean the box is refused at the terminal.

Why you rarely get to load the full payload

The container’s ~26–28 tonne payload is an upper bound you often can’t reach:

1. Road legal limits bind first. A loaded container travels on a truck, and the truck’s gross vehicle weight (GVW) and per-axle limits are usually stricter than the box’s payload. In many regions a full 40ft of dense cargo would put the rig over a legal axle weight long before the container itself is “full.” Overloaded axles mean fines, delays, and a safety risk.
2. Weight has to be distributed evenly. Even when the total is legal, concentrating it at one end or one side overloads an axle or makes the box unstable. The load’s centre of gravity needs to stay central, nose-to-door and side-to-side.
3. Volume often runs out first anyway. Light, bulky cargo fills the space well before it approaches the weight limit — see how many pallets fit for the volume side.

Weight-limited vs volume-limited cargo

A quick gut check tells you which constraint you’re fighting:

• Dense cargo (tiles, stone, liquids, canned goods, machinery, metals) is weight-limited — you hit the payload/axle ceiling with the floor barely covered. Spread it out; don’t double-stack.
• Light, bulky cargo (textiles, foam, packaging, plastics) is volume-limited — you run out of space with tonnes of payload to spare. Stack high.

Knowing which one you are decides your whole loading strategy. (Need the volume math? Use the free CBM calculator.)

Plan the weight, not just the fit

Most loading tools stop at “does it fit.” Weight is the half that gets shipments fined or rejected.

ContainerMath is container loading software that tracks weight and balance as you plan: it sums payload against the container limit, computes the centre of gravity, and — for road trailers — runs a per-axle load check so you see an overload before the truck does. Enter your cartons or pallets with their weights and it lays out a balanced 3D plan that respects both the space and the scale.

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Frequently asked questions

How much weight can a 20ft container hold?

About 28,200 kg (62,200 lb) of cargo. The max gross weight is ~30,480 kg and the empty container weighs ~2,200 kg, so payload ≈ 28,200 kg. Road and axle limits often cap the usable figure lower.

How much weight can a 40ft container hold?

About 26,700 kg (58,900 lb) of cargo — a touch less than a 20ft, because a 40ft weighs more empty (~3,750 kg tare) against the same ~30,480 kg max gross.

Why does a 20ft container carry more than a 40ft?

Both share the ~30,480 kg max gross weight set by the ISO standard, but the 40ft’s heavier tare leaves less room for cargo. So payload is higher in the 20ft.

What is the tare weight of a 20ft or 40ft container?

A 20ft container’s tare (empty) weight is about 2,200 kg (4,850 lb); a 40ft is about 3,750 kg (8,270 lb) and a 40ft High Cube about 3,900 kg (8,600 lb). Tare is stamped on the container doors and is subtracted from the max gross weight to give your usable payload — it’s also part of the VGM you declare.

What is VGM?

Verified Gross Mass — the SOLAS requirement to declare a loaded container’s verified total weight (cargo + tare) before vessel loading. It’s payload plus the tare stamped on the container.

What usually limits how much I can load — the container or the truck?

For dense cargo, the road/axle limits typically bind before the container’s own payload does. A loading plan that checks axle weights and centre of gravity — not just volume — keeps you legal.