About this calculator
Drums and bags are everyday packaging in Indonesian exports: steel or plastic drums for chemicals, oils and oleochemicals, and bags for rice, sugar, fertiliser, coffee or cocoa. Unlike cartons, drums are cylinders, so the way you arrange them on the floor decides how many fit. There are two basic patterns: square (drums in straight rows, like a grid) and staggered (every other row shifted by half a diameter so the drums nest into the gaps of the previous row).
Staggered rows do not always win. On the 2,352 mm floor of a 20' GP, four rows of Ø585 mm drums fit exactly in a square pattern, while a staggered pattern also gets only four rows but loses a drum in every shifted row. This calculator works out the square pattern and both directions of the staggered pattern, keeps the best one, multiplies it by the number of tiers that fit in the height and then applies the payload limit. Bags are treated as flat boxes with the dimensions of a filled bag, using the same engine as the cartons calculator.
The result is a planning estimate. Make sure the drums may be stacked (check the packaging marks and the specification of the contents), use boards or pallets between tiers where needed, and leave room for securing. Flexible bags bulge, so the real count can differ a little. If the contents are dangerous goods, follow the IMDG Code and the shipping line's requirements.
Worked example
Steel 200 litre drums of Ø585 × 880 mm, 230 kg each, go into a 20' GP (internal 5,898 × 2,352 × 2,393 mm).
- Square pattern: 5,898 ÷ 585 = 10 and 2,352 ÷ 585 = 4 → 40 drums per tier
- Staggered pattern: rows lengthwise give only 38, rows crosswise 39 → square wins
- Tiers: 2,393 ÷ 880 → 2 tiers → 40 × 2 = 80 drums
- Weight: 80 × 230 = 18,400 kg, within the 28,250 kg payload
Space, not weight, is the limit: 80 drums in two tiers.
How to use it
Choose the load space
Pick a container or truck from the catalogue, or enter the length, width, height and payload of your own space.
Enter drum or bag size
For drums, enter diameter, height and weight per drum; for bags, enter length, width and thickness of a filled bag and its weight.
Limit the tiers
Optional: set a maximum number of tiers when the drums or bags may not be stacked to the full height available.
Read and plan
See the best pattern, count per tier, total, weight and whether space or payload is the limit; open it in the 3D Planner for the full layout.