Question 1

How many standard 48" × 40" pallets fit in a 40-foot container?

Accepted Answer

A 40' standard dry container (internal length ~474", width ~92.5") fits 20 US/GMA pallets (48"×40") on the floor when loaded "pinwheel" style — 10 down each side, alternating long-side and short-side orientation. Some carriers and shippers load 21 pallets by inserting one extra at an angle in the doorway, but most published carrier maximums are 20. With double-stacking enabled (loaded pallet height under ~47"), the same 40' DC holds up to 40 pallet positions. The 40' high cube adds ~12" of clear height (~105.5" internal) which only helps if your pallets stack lower than ~52".

Question 2

How many pallets fit in a 20-foot container?

Accepted Answer

A 20' standard dry container holds 10 US/GMA pallets (48"×40") in a single layer, or 11 if you pinwheel and accept a tight fit at the door. Euro EUR1 pallets (1200×800 mm) fit 11 per layer in a 20' DC. Maximum payload of a 20' DC is roughly 47,900 lb (21,727 kg), so dense freight typically maxes out by weight before it fills the cube — at ~4,800 lb per pallet you hit the weight ceiling at exactly 10 pallets.

Question 3

What's the maximum cargo weight for an ocean container?

Accepted Answer

The constraint is the gross weight of the loaded container, capped by SOLAS VGM requirements and chassis road limits at the destination. For ocean ISO containers, typical max payload (gross weight minus tare): 20' DC ~47,900 lb, 40' DC ~59,040 lb, 40' HC ~58,540 lb, 45' HC ~60,610 lb. In practice, US chassis road limits cap a single-axle 20' DC drayage at roughly 39,000-44,000 lb of cargo before you need a tri-axle or split-chassis move. For 40' loads, anything over ~44,000 lb of cargo will likely need overweight permitting in most US states.

Question 4

How is a 53-foot trailer different from a 40-foot HC container?

Accepted Answer

A 53' US dry van trailer has ~3,800 ft³ of internal cube vs ~2,694 ft³ for a 40' HC — about 40% more volume. The 53' trailer also has wider (100" vs 92.5") and taller (109" vs 105.5") internal dimensions, allowing 26 US pallets in a "2 across × 13 deep" pattern (vs 20 in a 40' DC). But the 53' trailer is weight-capped at 45,000 lb under US 80,000-lb gross vehicle weight limits, while a 40' DC can carry 59,000+ lb. For heavy freight, the 40' wins on weight; for light/bulky freight, the 53' trailer wins on volume.

Question 5

Why does the calculator show "Volume" or "Weight" as the binding constraint?

Accepted Answer

Every load either runs out of cube or runs out of weight first. If you're shipping dense freight like canned goods, bottled liquids, metal parts, or paper rolls, you'll typically hit the weight cap with the container half-empty by volume — the calculator flags this as "Weight" bound. If you're shipping light/bulky goods like furniture, foam, insulation, packaging, or apparel, you'll fill the cube first — flagged as "Volume" bound. Understanding which one binds lets you make smarter packing decisions: weight-bound loads should densify cartons, volume-bound loads should densify the pallet (taller stacks, less void).

Question 6

Does this calculator handle mixed-SKU loads?

Accepted Answer

No — this is a single-SKU, single-orientation grid-pack model. It assumes every cargo unit has the same dimensions and weight, and that you can arrange them in a uniform pattern in the container. For mixed-SKU loads, the math is more complex (it's a 3D bin-packing problem with no closed-form solution) and you'll need a load-planning tool like CubeMaster, EasyCargo, or Goods On Pallet to get a realistic answer. As a fast first approximation, calculate each SKU individually and add the cubic feet and weight, then verify total cube and weight stay under the container limits.

Question 7

How accurate is this calculator vs an actual stuffed container?

Accepted Answer

For uniform cargo (single SKU, regular shape, stackable), the calculator is typically within 5% of a real load. The biggest sources of loss in the real world are: (1) dunnage and air-bag space at the doors and between layers, (2) load-plan asymmetry — real loads aren't always perfectly aligned grids, (3) ULDs and irregular packaging, (4) hazmat segregation requirements that force gaps. For mission-critical loads — high-dollar cargo, hazmat, or anything where overflow is expensive — validate the plan with a freight forwarder or 3D load-planner before booking the equipment.

Container	Units Fit	Binding Constraint	Volume Use	Weight Use
20' DC Workhorse for heavy or dense ocean freight. ~1,172 ft³.	315	Volume	71%	23%
40' DCRecommended Most common ocean container worldwide. ~2,389 ft³.	665	Volume	74%	39%
40' HC +12% volume vs 40' DC; ~2,694 ft³. Standard for light/bulky goods.	812	Volume	81%	49%
45' HC +13% volume vs 40' HC; ~3,043 ft³. Limited port availability.	924	Volume	82%	53%
53' Trailer US domestic OTR standard. ~3,800 ft³. Weight-capped at 45,000 lb under 80k GVW.	1,285	Weight	86%	100%

Container	Internal L × W × H (in)	Volume (ft³)	Max Payload (lb)	US Pallets (Floor)
20' DC	232.9 × 92.5 × 94.3	~1,172	47,900	10 (48"×40")
40' DC	474.0 × 92.5 × 94.3	~2,389	59,040	20 (48"×40")
40' HC	474.0 × 92.5 × 105.5	~2,694	58,540	20 (48"×40")
45' HC	534.0 × 92.5 × 105.5	~3,043	60,610	22-24 (48"×40")
53' Trailer	630.0 × 100.0 × 109.0	~3,800	45,000	26 (48"×40")

Container Loading Calculator

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Standard Container Internal Dimensions & Payloads (2026)

When to use this calculator

Importers booking ocean freight

3PLs receiving inbound containers

Ecommerce brands buying inventory

Domestic shippers planning LTL vs TL

Container Loading FAQ

How many standard 48" × 40" pallets fit in a 40-foot container?

How many pallets fit in a 20-foot container?

What's the maximum cargo weight for an ocean container?

How is a 53-foot trailer different from a 40-foot HC container?

Why does the calculator show "Volume" or "Weight" as the binding constraint?

Does this calculator handle mixed-SKU loads?

How accurate is this calculator vs an actual stuffed container?

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