Last updated: November 2, 2026
How Many Doors Fit in a 20ft Container? Loading Calculator
Quick answer: There is no universal door-per-container number — there is a formula. A standard 20ft (20GP) box offers about 5.90 × 2.35 × 2.40 m inside (≈33.2 m³), but doors load by floor footprint × safe stack height, not by raw volume. On the worked examples below: flat-bundled slabs only reach a geometric ceiling near 190 leaves and plan materially lower once frames and hardware ride along; cartoned prehung sets at 2.20 × 1.05 × 0.22 m footprint work out to 50 sets by geometry (≈40–50 planning range); individually crated premium doors land around 40. Use the 5-step method and worksheet to price your order on your pack formats, not on anyone’s headline number.
The box: dimensions that actually govern loading
| 20GP specification | Value used here | Why it matters |
|---|---|---|
| Internal L × W × H | ≈ 5.90 × 2.352 × 2.395 m | Sets the floor grid and maximum stack height |
| Nominal internal volume | ≈ 33.2 m³ | Routing check only — never divide this by product CBM and call it a loading plan |
| Door opening height | ≈ 2.29 m | A pre-built stack must pass the door aperture, so plan working stack heights below the roof line |
| Maximum payload | Plate-dependent; many modern 20GP units are plated around 28 t, others lower | Always price against the actual CSC plate plus carrier and road limits at destination — not a memorised figure |
The 5-step loading method
- Define the packed unit. One door as shipped: packed length × width × pitch (per-door stack increment including separators and protection). Slab-only, slab + frame in one carton, and prehung set are three different packed units — never average them.
- Grid the floor in both orientations. Stacks = ⌊5.90 ÷ packed L⌋ × ⌊2.35 ÷ packed W⌋, then swap L/W and keep the better result. Long packs usually win across the width, not along it.
- Set the safe stack height. Units per stack = ⌊(working height − skid/pallet) ÷ pitch⌋, capped by the pack’s stacking strength and the factory’s bundle limit. Working height must clear the ≈2.29 m door opening with handling margin.
- Multiply, then subtract reality. Deduct frames and hardware cartons loaded separately, mixed-size voids, bracing and any non-stackable items to get the planning quantity you may quote against.
- Run the weight check (below) and get the factory’s per-SKU packing list — doors per pack, packed dims, gross weight, stackable or not — before you book equipment. Pair this with our FCL vs LCL break-even method.
Three worked examples (check the maths)
| Format (assumptions stated) | Packed unit | Floor stacks | Per stack | Geometric ceiling | Planning quantity* |
|---|---|---|---|---|---|
| A. Flat-bundled slabs only (wrapped leaf 2.05 × 0.95 m, 65 mm pitch incl. separators, 120 mm skid, 2.20 m working height) | 0.127 m³ | 6 (packs across the width) | 32 max geometry; ≈22–27 at sensible bundle weights | ≈192 slabs | ≈130–160 slabs, before frames/hardware cartons take their share |
| B. Prehung set in carton (leaf + frame, 2.20 × 1.05 m, 220 mm pitch, 2.20 m working height) | 0.508 m³ | 5 | 10 | 50 sets | ≈40–50 sets depending on carton stacking strength |
| C. Premium door, individual crate (2.25 × 1.10 m, 180 mm pitch, crate stack capped at 8 high) | 0.446 m³ | 5 | 8 (strength-capped; geometry alone would allow more) | 40 at the cap (60 uncapped geometry — do not use) | ≈36–40 doors |
Notice example B: the naive “33.2 m³ × 85% ÷ 0.508 m³” shortcut suggests ≈55 sets. The floor grid says 50 before any real-world deduction. That gap — air at the ends of rows that no door can occupy — is where most online loading charts quietly over-promise.
Where the theoretical number leaks away
- Frames and hardware: slab-count headlines forget the frames, architraves and hardware cartons that must ride in the same box.
- Size mix: every additional leaf size multiplies voids; consolidating sizes is the cheapest loading optimisation there is.
- Glazing and prehung assemblies: upright A-frame loading, glass protection and non-stackable units trade density for survival — cost per surviving door is the metric, not doors per box.
- Destination handling: if the receiver has no forklift or the site cannot take 800 kg bundles, pack size — not container geometry — becomes the binding constraint.
Weight check: when doors weigh out before they cube out
For typical wooden interior doors, geometry usually binds first: example A at, say, 32 kg gross per wrapped slab × 150 ≈ 4.8 t — far below any 20GP payload plate. Weight takes over with solid hardwood entry doors, steel-clad or heavily glazed units, and stone/metal inlay designs. Run both checks every time: total gross = quantity × packed gross weight + packing, against the booked unit’s CSC plate and the road weight limits on the delivery leg, which are often lower than the plate. Overweight at destination means devanning fees, not a shrug.
Worksheet: run your own order
| Field | Your value | Source |
|---|---|---|
| Packed L × W (m) per SKU | ___ × ___ | Factory packing list, measured on a trial pack |
| Pitch / doors per pack | ___ m / ___ per pack | Trial stack photo with tape in frame |
| Gross weight per packed unit (kg) | ___ | Scale ticket on the trial pack |
| Stackable? Max stack height | ___ | Factory pack spec (carton grade / crate design) |
| Frames/hardware per door (m³) | ___ | Packing list lines for separate cartons |
| Size mix (SKUs > 3?) | ___ | Door schedule consolidation review |
Send sizes, quantities and whether you need slabs, slab + frame or prehung sets. We return a pack-by-pack loading plan with packed dims, weights and photos from a trial stack — the same worksheet above, filled with factory data: Request a container loading plan · More sourcing guides
FAQs
How many interior doors fit in a 20ft container?
It depends entirely on pack format. Flat-bundled slabs can exceed 130 leaves on the stated assumptions above; the same doors as cartoned prehung sets land near 40–50. Anyone quoting one number without a packed size is guessing.
Why not just divide 33 m³ by the door’s CBM?
Because doors are large rigid rectangles: end-of-row voids, skid heights, stack-strength caps and separate frame cartons mean footprint-and-stack geometry, not bulk volume, decides the count.
Is a 40HQ always cheaper per door?
Often but not always: doors cube out before they weigh out, so the extra height of a 40HQ helps, but the comparison must run on current all-in rates to your port and your ability to fill it without mixing in damage-prone cargo.
What should I demand from the factory before booking?
A per-SKU packing list: packed L×W×H, doors per pack, gross weight, stackable yes/no with max stack, plus trial-pack and loading photos matched to your door schedule lines.
