How Many Containers
Fit on a Cargo Ship?

If you have ever looked at a container ship and wondered how many boxes are actually on it, the answer depends on which class of ship it is. The fleet ranges from small feeder vessels carrying a thousand boxes to the largest ships in the world carrying more than 24,000.

This guide breaks down the capacity by vessel class, explains TEUs vs FEUs, and shows what those numbers mean for the lanes your freight actually moves on.

The short answer

That number is misleading on its own because no two ships are the same size and lane routing dictates which class shows up at which port.

What is a TEU?

A TEU is a Twenty-foot Equivalent Unit. It is the standard measure of container ship capacity. The math is simple:

• One 20-foot container = 1 TEU
• One 40-foot container = 2 TEUs
• One 45-foot high cube = 2.25 TEUs (rarely counted this way; usually 2)

FEU (Forty-foot Equivalent Unit) is the same metric measured in 40-foot units. 1 FEU = 2 TEUs. Most operators quote TEU because it is the lower common denominator. When someone tells you a ship carries "13,000 boxes," they usually mean 13,000 TEUs, which would be roughly 6,500 forty-foot containers.

Container ship classes by capacity

The global fleet is segmented by size class, and each class is matched to specific lanes:

Class	TEU Capacity	Typical Lanes
Small Feeder	1,000 to 2,000	Intra-Asia, intra-Europe shuttles
Feeder	2,000 to 3,000	Hub-and-spoke connector routes
Feedermax	3,000 to 5,000	Regional trade, smaller ports
Panamax	5,000 to 10,000	Original Panama Canal limit, now legacy
Post-Panamax	10,000 to 14,500	Trans-Pacific to US West Coast
New Panamax (Neopanamax)	14,500 to 21,000	Expanded Panama Canal, US East Coast service
ULCV (Ultra Large Container Vessel)	21,000+	Asia-Europe, Asia-US West Coast hub services

Why ship class matters for your shipment

The class of ship your container is on affects three things you actually care about:

Transit time

Larger ships run faster on average, but they call at fewer ports. A 20,000 TEU ship from Shanghai to Long Beach takes 14 to 18 days door-to-door. A 6,000 TEU ship on the same lane might take 21 to 25 days because it makes intermediate stops.

Port options

ULCVs only call at deep-water ports with massive crane reach. In the US, that limits them to LA/Long Beach, Oakland, Seattle/Tacoma, and (post-expansion) New York and Charleston. If you want to land in a smaller port, you are likely getting a smaller ship or a transshipment.

Cost

Larger ships have lower per-container cost. When you book on a 20,000 TEU vessel, you are paying for economies of scale that are not available on the 5,000 TEU lane. This is why trans-Pacific spot rates are historically cheaper than intra-Asia rates per nautical mile.

The biggest ships in the world today

As of 2026, the top container ships by capacity:

1. MSC Irina: 24,346 TEUs (2023)
2. OOCL Spain: 24,188 TEUs (2023)
3. Ever Alot: 24,004 TEUs (2022)
4. HMM Algeciras: 23,964 TEUs (2020)
5. MSC Gulsun: 23,756 TEUs (2019)

These ships almost exclusively run Asia-Europe and Asia-US West Coast hub routes. They are too big for the Panama Canal even after expansion (the new locks max out around 15,500 TEUs).

What does that look like physically?

A 24,000 TEU ship is about 400 meters long (1,312 feet), 61 meters wide (200 feet), and carries containers stacked 11 high above deck and 12 high below. If you laid all the containers from a single ULCV end-to-end, they would stretch about 91 miles.

For perspective: one ULCV carries roughly as much cargo as 200 freight trains with 50 cars each, or about 12,000 average semi-trucks.

What sails to the US most often

For the China to US West Coast (FAK, NW Shanghai-Long Beach) lane, the ships in regular service are typically:

• 13,000 to 16,000 TEU Post-Panamax and Neopanamax vessels on the express services
• 18,000 to 24,000 TEU ULCVs on the alliance flagship services (2M, Ocean Alliance, THE Alliance)

For China to US East Coast via Panama, ships are limited to Neopanamax sizes, so 14,000 to 15,000 TEUs is the typical capacity. Via Suez Canal, larger ships can be used but transit time is 30+ days.

How many of your containers fit?

If you book a 40 ft container on a 14,000 TEU vessel, you are one of about 7,000 forty-foot equivalents on that ship. Your container is one slot out of 7,000. That is part of why ocean freight is cheaper per pound than air: massive consolidation.

For most clients, the ship class is invisible. We book the lane and the carrier; the carrier assigns the vessel. What matters is reliability, transit time, and equipment availability, not which specific ship.

Bottom line

A modern container ship carries between 1,000 and 24,000 TEUs depending on class. The trans-Pacific fleet typically moves 13,000 to 18,000 TEU vessels. The biggest ships in the world are too big for the Panama Canal and run only on Asia-Europe and Asia-US West Coast hub services.

When you book a container, you are renting a fraction of one of these floating cities. Knowing the class helps explain transit times and port options, but for most shippers, what matters is the carrier and the lane, not the vessel.

Further reading

• FCL vs LCL shipping
• NVOCC vs freight forwarder
• FOB vs DDP cost and risk breakdown
• Import duties from China to the USA