Coffee Export

Container Loading for Green Coffee

This is one of the most searched questions in green coffee logistics and one of the most confidently answered with numbers that are wrong for the reader’s situation. The calculation itself is simple; the inputs are what vary.

Last reviewed August 20263 min read

Quick answer

There is no universal answer. A 20ft container is usually payload-limited rather than volume-limited for green coffee in bags: the weight ceiling is reached before the space runs out. The real limit is the lower of the container’s payload plate, the shipping line’s stated maximum, and the road weight limit on the origin leg — which is why this page gives you a calculator rather than a figure.

Why there is no single number

Green coffee in jute bags is dense. In a 20ft dry container, the weight limit is normally reached well before the cubic capacity is used. So the binding constraint is a weight, and that weight is set by whichever of the following is lowest.

1The container’s payload plate. Maximum gross weight minus tare, both stamped on the door of that specific container. Two nominally identical 20ft boxes can differ.
2The shipping line’s stated maximum. Lines impose their own limits, which can be below the plate.
3Road weight limits on the origin leg. Frequently the real constraint in East Africa — particularly on the long inland corridors from Uganda, Rwanda, Burundi and Ethiopia. A container that could legally sail may not be legally trucked to the port.
4Destination road limits. The same problem at the other end, and easy to forget until the box cannot leave the terminal fully loaded.
5Stow pattern and packaging. Palletised cargo uses more space per kilo than floor-loaded bags; bulk liners change the arithmetic entirely.

The number that matters is on the door

Payload varies between individual containers. Any planning figure is provisional until the specific container is allocated and its plate is read. Never contract a bag count that assumes a payload you have not verified.

20ft dry container

40ft dry container

Schematic only — bag count is not to scale and is not a load figure. Actual loading is limited by the container’s payload plate, road weight limits on the origin leg, the shipping line’s stated maximum and the stow pattern used.

Schematic only — not a load figure.

The arithmetic

Once the binding weight limit is known, the calculation is straightforward:

The calculation

Net coffee weight available: Binding payload limit − total tare of bags and liners − dunnage
Number of bags: Net coffee weight ÷ bag fill weight, rounded down
Check against volume: Bag count × bag volume must fit the container’s internal cube with a working allowance

The calculator on this page performs exactly that, and requires you to supply the payload figure rather than assuming one. It also flags when a load becomes volume-limited rather than weight-limited, which happens with lighter fills and with palletised cargo.

Stow patterns

Loading methods compared
Method	Space efficiency	Lot separation	Handling at destination
Floor-loaded bags	Highest	Full — bags stay identifiable	Manual or mechanical unloading, slower
Palletised bags	Lower — pallets consume height and floor	Full	Fast; forklift straight off
Slip-sheeted	Between the two	Full	Requires push-pull attachment
Bulk container liner	Highest per kilo	None within the container	Requires tipping or vacuum discharge

Palletisation reduces the payload available for coffee — the pallets themselves are weight — while making destination handling substantially faster. It is a landed-cost decision, not just a loading one.

Protecting the cargo in transit

A container crossing from East Africa to Europe or North America passes through large temperature swings. Warm humid air trapped at stuffing condenses on the container roof as the box cools, and drips back onto the cargo — "container rain". It is a leading cause of arrival moisture and mould claims.

Desiccant — hanging moisture-absorbing units, sized to the voyage and the cargo moisture.
Kraft paper or cardboard lining on walls and roof, keeping bags off cold steel surfaces.
Dunnage to prevent shifting; a collapsed stack damages bags and liners.
Container inspection before stuffing — dry, clean, odour-free, no light visible through seams, no protrusions.
Stuffing photographs and a seal record — part of the loading documentation, and the evidence base for any later claim.

Loading plans and supervision

Tell us your bag weight, payload constraints and destination handling, and we will plan the load around them.

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Container loading calculator

Enter your own payload limit. The tool will not assume one, because the binding figure is a property of a specific container on a specific route.

Container

Container type

Maximum payload (kg)

From the container's door plate: max gross weight minus tare. Confirm the shipping line's own limit too.

Road weight limit (gross, kg)optional

Legal maximum on the origin leg. Frequently the binding constraint from landlocked origins.

Container tare (kg)optional

Also on the door plate. Defaults to a typical 20ft figure if left blank.

Bags

Bag fill weight

Bag tare (kg)optional

Weight of the empty jute sack.

Include hermetic liner (adds 0.15 kg tare per bag)

Number of bags (optional)optional

Leave blank to calculate the maximum the limits allow.

Stow assumptions

Effective stow density (kg/m³)optional

Coffee plus the voids between bags. Floor-loaded bags stow more densely than palletised.

Internal volume (m³)optional

Nominal 20ft capacity is about 33.2 m³ and varies by build.

Dunnage, desiccant and lining allowance (kg)optional

Deducted from the available payload.

Frequently asked questions

How many bags of green coffee fit in a 20ft container?

It depends on the bag weight and, more importantly, on the binding weight limit — which is the lowest of the container’s payload plate, the shipping line’s maximum and the road weight limits on the origin and destination legs. Use the calculator on this page with your own figures rather than relying on a generic number.

Is a coffee container weight-limited or volume-limited?

Green coffee in bags in a 20ft container is normally weight-limited — the payload runs out before the space does. Lighter fills, palletisation and 40ft containers can shift the constraint to volume, which the calculator flags.

Why does the road weight limit matter if the ship can carry more?

Because the container has to reach the port. On the long inland corridors from Uganda, Rwanda, Burundi and Ethiopia, the legal road limit is frequently lower than the container’s payload plate, and it binds first.

What is container rain?

Condensation forming on the container roof and walls when warm humid air trapped at stuffing cools during the voyage, then dripping onto the cargo. It is a leading cause of arrival moisture damage and is managed with desiccant, lining and control of the moisture loaded in the first place.

Should I palletise?

It depends on your destination handling. Pallets make unloading far faster but consume payload and cube, reducing the coffee per container. It is a landed-cost calculation rather than a loading preference.

Tell us the coffee you need

Lots can be specified by origin, region, process, grade, screen, moisture, defect tolerance, crop year and packaging. Send what you know and we will confirm what each origin realistically supports.