Guide · Loading and pallets
20 ft vs 40 ft Container
Yuri Kan Checked against 23 of 88 published sheets Updated
A 20 ft container is 6.058 m (19′10½″) long and a 40 ft 12.192 m (40′), on the same 2.438 × 2.591 m (8′ × 8′6″) cross-section. So a 40 ft holds about double the volume of a 20 ft — 67.7 m³ against 33.2 m³ (2,391 ft³ against 1,172 ft³), as 15 of 16 and 18 of 18 published sheets print them — but only 550 kg (1,213 lb) more payload: 28,800 kg against 28,250 kg on the ratings most sheets print. Ask for both rates on the same lane: at any 40 ft rate under 2.04 times the 20 ft’s, the forty costs less per m³. Rule: cargo denser than about 850 kg/m³ (where a 20 ft fills its weight and its space together) → 20 ft or two twenties; volume cargo past a 20 ft’s usable 28.2 m³ → 40 ft; well under half a 20 ft (16.6 m³) → compare an LCL quote.
The table puts one against the other; each box’s full measurements, with drawings, are on its own page: 20 ft container dimensions and 40 ft container dimensions.
20 ft vs 40 ft head to head: same door, double the volume
| Measure | 20 ft | 40 ft |
|---|---|---|
| External L × W × H | 6.058 × 2.438 × 2.591 m19′10½″ × 8′ × 8′6″ | 12.192 × 2.438 × 2.591 m40′ × 8′ × 8′6″ |
| Internal L × W × H | 5.898 × 2.352 × 2.393 m19′4″ × 7′8½″ × 7′10″ | 12.032 × 2.352 × 2.393 m39′5½″ × 7′8½″ × 7′10″ |
| Door W × H | 2.340 × 2.280 m7′8″ × 7′6″ | 2.340 × 2.280 m7′8″ × 7′6″ |
| Volume | 33.2 m³1,172 ft³ | 67.7 m³ (2.04×)2,391 ft³ |
| Payload | 28,250 kg62,281 lb | 28,800 kg63,493 lb |
| Tare | 2,230 kg (the sheets: 2,080–2,570 kg)4,916 lb | 3,700 kg8,157 lb |
| Pallets, one tier | 11 EUR / 10 GMA | 25 EUR / 21 GMA |
Three things jump out of the table:
- Width and height are identical, 2.438 and 2.591 m external. Anything that fits through one door (2.340 × 2.280 m on both) fits through the other.
- Volume about doubles, because length is the only variable.
- Payload barely moves. Most forties are rated 32,500 kg against the twenty’s 30,480 kg, but the longer box spends 1,470 kg more on its own steel. So the forty carries only 550 kg more cargo than a box half its size, and an older forty rated 30,480 kg carries less than a twenty.
The forty is not “a bigger twenty” — it is a different tool. The 20 ft is a weight carrier: 28,250 kg of payload wrapped in 33.2 m³. The 40 ft is a volume carrier: double the space, only 550 kg more weight allowance.
The bars below plot the split that decides most bookings: how each box’s max gross rating — 30,480 kg for the 20 ft, 32,500 kg for most 40 ft boxes — divides into steel (tare) and cargo (payload).
Checked : outside sizes set by ISO 668, read in IS 6566:2001, GOST R 51876-2008 and GOST R 53350-2009; every other figure against 23 published sheets of 19 lines, lessors and makers. A sheet agrees within ±5 mm, or ±2 % for a mass and ±1 % for a volume; a maximum gross is a rating and must be the same. Every figure and its sources
The numbers in this chart
| Container | Tare, kg | Payload, kg | max gross, kg |
|---|---|---|---|
| 20 ft container | 2,230 | 28,250 | 30,480 |
| 40 ft container | 3,700 | 28,800 | 32,500 |
Checked : the figures in this chart against 23 of 88 published sheets from 19 lines, lessors and makers: those that print these figures. A sheet agrees within ±5 mm, or ±2 % for a mass and ±1 % for a volume; a maximum gross is a rating and must be the same. Every figure and its sources
Two twenties or one forty: the weight of the cargo decides
For heavy cargo the comparison is not 20 vs 40 at all — it is 2 × 20 vs 1 × 40. Two twenties offer 2 × 28,250 kg = 56.5 t of combined payload against the forty’s 28.80 t: nearly double the weight capacity in the same 2-TEU ship slot.
Stone, steel coil, ingots, tiles, drummed liquids — anything around or above 850 kg/m³ — books twenties. A 40 ft loaded with such cargo hits its weight ceiling while still half empty. Each 20 ft also goes on its own truck, so the road weight limit applies to half the cargo at a time.
For volumetric cargo the logic flips. A pair of twenties means two of everything, and twice the 20 ft rate; one 40 ft means one of each:
- one lift at each port;
- one trucking leg;
- one customs entry;
- one set of terminal handling charges.
Furniture, garments, appliances, e-commerce cartons: one forty, always. For machinery, the payload figure is not the whole answer: ask the carrier for the floor’s rating under a concentrated load.
The numbers in this chart
| Container | kg/m³ |
|---|---|
| 20 ft container | 851 |
| 40 ft container | 425 |
| 40 ft high cube container | 375 |
| 45 ft high cube container | 324 |
Every figure checked: ISO 668 + 32 published sheets · · Every figure and its sources
The rate per cubic metre: when the 40 ft is the cheaper box
The pricing fact that decides most bookings: a 40 ft holds 2.04 times the volume of a 20 ft and takes 2.27 times the EUR pallets on its floor. So at any ocean rate below 2.04 times the 20 ft rate, the 40 ft is the cheaper box per m³; below 2.27 times, it is the cheaper per pallet spot.
We publish no ratio of the two rates: it moves with the lane and the cycle, so ask for both on the same lane and divide.
That sets the crossover at the volume you can plan into a 20 ft: 85% of 33.2 m³, about 28.2 m³. Once your cargo passes it, the choice is a forty or two twenties, and the forty costs less whenever its rate is under twice the twenty’s.
Compute your cargo volume with the CBM calculator and compare per m³, not per box.
The gap widens once surcharges land. Terminal handling, documentation, customs brokerage, chassis and drayage fees are billed per container, not per cubic metre. A $600 destination handling charge, as an example, is $18/m³ on a full twenty but $9/m³ on a full forty.
On short-haul lanes where the base ocean rate is small, these flat per-box fees can make the 40 ft the cheaper absolute choice for a load well short of a full twenty.
The high-cube variants: the 40 ft HC is the default forty
Both lengths exist in high cube (9′6″ external, 2.698 m internal height), but the market treats them differently. The 40 ft HC is now the default 40-footer: +8.7 m³ (76.4 m³ vs 67.7 m³) on the same 32,500 kg max gross, with 28,670 kg of payload against 28,800 kg.
Ask for both rates on your lane; where they are close, there is rarely a reason to prefer the standard height. The 20 ft HC exists but is scarce; plan around the standard 20 ft.
So the practical present-day choice is 20 ft vs 40 ft HC, which makes the volume gap 33.2 m³ vs 76.4 m³ — 2.3×, not 2×. That pushes the per-m³ economics even further toward the big box. Full spec comparison for both, side by side: container comparison tool.
Three worked examples: tile, flat-pack furniture and a CNC machine
Ceramic tile, 24 t, 12 m³. Density 2,000 kg/m³ — weight-bound: the load takes 85% of a 20 ft’s payload and 36% of its volume. A 20 ft takes the whole consignment; a 40 ft would carry the identical load at a higher rate and gain nothing.
If the tile order grows past the twenty’s 28,250 kg, it splits into two twenties. It never upgrades to a forty, whose payload is only 550 kg more.
Flat-pack furniture, 8 t, 55 m³. Density 145 kg/m³ — volume-bound. Two twenties (66.4 m³ combined) cost twice the 20 ft rate.
One 40 ft HC (76.4 m³) costs whatever the lane quotes for it — compare that with the two — and leaves 21 m³ of growth room. One box, one customs entry: the forty wins.
A 17 t CNC machine, 2.2 m tall on a 3 m skid. Fits either box through the identical 2.340 × 2.280 m door with 80 mm of height to spare. The 20 ft takes it:
- the machine’s 17 t is well within the 20 ft’s 28,250 kg payload;
- the shorter box is simpler to position at destination;
- the unused 9.0 m of a 40 ft floor would be paid-for air.
The pattern generalises — singular heavy items default to the 20 ft, distributed light loads to the 40 ft.
Decision rules: when to book a 20 ft, a 40 ft, two or neither
Book a 20 ft when any of these holds:
- cargo density exceeds about 850 kg/m³;
- total volume fits within a 20 ft’s usable 28.2 m³;
- destination roads or cranes limit gross weight;
- the site (urban delivery, small yard) cannot take a 12 m box plus truck.
Book a 40 ft (HC) when any of these holds:
- volume exceeds a 20 ft’s usable 28.2 m³ at moderate density;
- cargo is palletised and light (25 EUR spots vs 11, so cheaper per pallet at any rate below 2.27× the 20 ft’s);
- one consignee takes the whole shipment.
Book two twenties when total weight exceeds a 20 ft’s 28,250 kg payload, or the shipment splits between destinations.
Book neither when any of these holds:
- cargo is well under half a 20 ft (16.6 m³): compare an LCL (shared container) quote;
- cargo is taller than 2.393 m (7′10″): high cube territory;
- you need maximum EUR pallet count in Europe: the 45 ft pallet-wide takes 33, from one sheet (CMA CGM).
Buying for static storage flips two factors. Delivery: a 20 ft arrives on a common tilt-bed truck and needs around 60 ft (18.3 m) of straight clearance to set down. A 40 ft needs about 120 ft (36.6 m): US dealers’ site requirements, as 2 independent documents print it (Eveon Containers and Dry Box). On many residential and farm sites this, not price, decides the size.
Cost per cube: a used cargo-worthy 40 ft sells at $2,100–3,400 and a 20 ft at $1,700–2,800 (US asking prices, the middle of the ranges 4 named dealers and price guides publish, read in October 2026). That makes the big box far cheaper per m³.
Two twenties beat one forty only when you want doors at two locations or the option to sell one later. Market ranges by grade: container prices.
Frequently asked questions
Is a 40 ft container double the price of a 20 ft?
Not necessarily — a 40 ft holds 67.7 m³ (2,391 ft³) against 33.2 m³ (1,172 ft³), so at any 40 ft ocean rate under 2.04× the 20 ft’s it is the cheaper box per m³; ask for both rates on the same lane. Purchase prices are closer: a used cargo-worthy 20 ft is $1,700–2,800 vs $2,100–3,400 for a 40 ft — US asking prices, the middle of the ranges 4 named dealers and price guides publish, read in October 2026.
Does a 20 ft container carry more weight than a 40 ft?
Not for most boxes: a 40 ft rated 32,500 kg carries 28,800 kg (63,493 lb), 550 kg more than a 20 ft’s 28,250 kg (62,281 lb) — the rating 12 of 15 published 40 ft sheets print. Only an older 40 ft rated 30,480 kg, like the twenty, carries less — 26,480–26,840 kg on the sheets that print one — because its extra steel comes straight out of payload.
Is it better to ship two 20 ft containers or one 40 ft?
For volume cargo, one 40 ft whenever its rate is under the 2× you pay for two twenties — ask for both on the same lane — plus one set of handling, trucking and customs fees instead of two. Two twenties win for heavy cargo (56.5 t combined payload vs 28.80 t) and for shipments splitting to different destinations.
How much more volume does a 40 ft have than a 20 ft?
A 40 ft has 2.04 times the volume of a 20 ft — 67.7 m³ against 33.2 m³ (2,391 ft³ against 1,172 ft³), as 15 of 16 and 18 of 18 published sheets print them — because only the length changes. The 40 ft high cube stretches that to 76.4 m³, 2.3× the 20 ft.
Do a 20 ft and 40 ft container have the same door size?
Yes: 2.340 m wide × 2.280 m tall (7′8″ × 7′6″) on both standard-height boxes — per 13 of 16 sheets, and most of the 20 ft’s print the same. Anything that physically enters a 20 ft enters a 40 ft — high cubes raise the door to 2.585 m (8′6″) tall.
How many pallets fit in a 20 ft vs a 40 ft container?
11 EUR (or 10 GMA) in a 20 ft versus 25 EUR (21 GMA) in a 40 ft, single tier. That is 2.27 times the EUR spots, so at any 40 ft rate below 2.27× the 20 ft rate a pallet spot costs less in the forty.
When is a 20 ft container the right choice?
Dense cargo above about 850 kg/m³ (metal, stone, tiles, paper, liquids), total volume within a 20 ft’s usable 28.2 m³, weight-restricted delivery roads, or tight sites where a 12 m box plus truck cannot manoeuvre.
Should I choose a standard 40 ft or a 40 ft high cube?
The high cube, almost always: 8.7 m³ (307 ft³) more — 76.4 m³ per all 19 sheets, against 67.7 m³ — for about the same payload (28,670 kg / 63,207 lb against 28,800 kg / 63,493 lb; per all 16 sheets); ask for both rates on your lane. The standard-height 40 ft persists mainly in older leasing fleets.