How many 18 × 18 × 16 in boxes fit in a 40ft container?
18 × 18 × 16 in boxes of 457 × 457 × 406 mm (also called 3 cubic foot boxes, medium moving boxes) in a 40-foot standard container (40GP) — inner dimensions 12,032 × 2,352 × 2,393 mm. Calculated by the Cubestow engine on 2026-09-08.
Boxes may be laid on any side. 91% of the space used, 5 layers high, about 10,150 kg (38% of payload). Open this load in the 3D planner →
Top view — floor layer (145 on the floor)
Side view — first row along the wall (5 layers)
The answer in detail
The "3.0 cubic foot" medium moving box (18 × 18 × 16 in) is the box most US movers use for the bulk of a household. Lying it on its side gains height in some containers, which is why the any-orientation count is higher.
Twice the floor of a 20ft at the same width and height. Its rated payload is usually a little lower than a 20ft, so dense cargo often maxes out weight before space.
The simple grid estimate is 26 along the length × 5 across × 5 high = 650. The engine found 725 — 75 more than either uniform grid — by mixing orientations so that the leftover strip along the wall is used and by choosing the orientation that gives the most layers. The top view above shows the pattern.
Variants
| Loading rule | Fits | Layers | Volume used | Total weight |
|---|---|---|---|---|
| Boxes may be laid on any side (headline figure) | 725 | 5 | 91% | 10,150 kg (38% of payload) |
| Boxes kept this-side-up (turned on the floor plane only) | 650 | 5 | 81% | 9,100 kg (34% of payload) |
How many 40ft containers for a given order?
| 18 × 18 × 16 in boxes | 100 | 250 | 500 | 1,000 | 2,500 | 5,000 |
|---|---|---|---|---|---|---|
| 40ft containers needed | 1 | 1 | 1 | 2 | 4 | 7 |
| Last one filled to | 14% | 34% | 69% | 38% | 45% | 90% |
Mixed cargo, different carton sizes or delivery stops? Plan the exact shipment in 3D — free, in the browser, nothing uploaded.
Frequently asked
How many 18 × 18 × 16 in boxes fit in a 40ft container?
725 18 × 18 × 16 in boxes of 457 × 457 × 406 mm fit in a 40ft container (inner dimensions 12,032 × 2,352 × 2,393 mm), boxes may be laid on any side. That uses 91% of the 67.7 m³ available and weighs about 10,150 kg.
What are the inner dimensions of a 40ft container?
Typical inner dimensions are 12,032 mm long, 2,352 mm wide and 2,393 mm high (473.7 × 92.6 × 94.2 in), giving 67.7 m³ of space and a rated payload of about 26,700 kg. Individual units vary by a few centimetres, so check the actual box for tight loads.
How much does a full load of 18 × 18 × 16 in boxes weigh?
725 × 14 kg ≈ 10,150 kg, which is 38% of the 26,700 kg payload — so this load is limited by space, not weight.
How was this number calculated?
By running the Cubestow 3D load-planning engine on the exact dimensions above, allowing all six orientations, stacking with at least 80% base support and the container's payload limit, then re-validating the plan for overlaps, support and weight. Real loads leave room for dunnage, door clearance and uneven cartons, so treat the figure as the practical maximum.