Container sizes

Flat rack container dimensions (20ft and 40ft)

Updated September 28, 2026Figures calculated with our 3D loading engine

Short answer

A 20ft flat rack has a loading area of about 5.64 × 2.44 m with end walls about 2.23 m high and a payload of around 42,000 kg; a 40ft flat rack is about 11.65 × 2.35 m, 2.27 m high, with around 49,000 kg payload. Flat racks have no side walls or roof, so they carry cargo that is too wide, tall or heavy for other containers.

20ft vs 40ft flat rack

Example values from Hapag-Lloyd's published specifications (20' flatrack and 40' flatrack high cube). Collapsible and fixed-end designs vary.
20ft flat rack40ft flat rack (HC)
Inside length5.64 m (18′ 6″)11.65 m (38′ 3″)
Inside width2.44 m (8′)2.35 m floor / 2.25 m min.
Inside height (end walls)2.23 m2.27 m
Tare2,900 kg5,900 kg
Max payload42,100 kg49,100 kg

What flat racks are used for

  • Vehicles, boats, construction and agricultural machinery.
  • Oversized cargo such as transformers, generators, tanks and steel structures.
  • Very heavy items that need a high payload and lashing points along the sides.

Cargo wider or taller than the flat rack is shipped as out-of-gauge (OOG) cargo and needs carrier approval. For tall cargo that fits the width, an open top container is usually cheaper.

Check your own cargoEnter your carton or pallet size and get a 3D loading plan in seconds.
Open in the load calculator →

Frequently asked questions

What are the dimensions of a 20ft flat rack?

About 5.64 m long and 2.44 m wide inside, with end walls about 2.23 m high.

What are the dimensions of a 40ft flat rack?

About 11.65 m long and 2.35 m wide, with end walls about 2.27 m high for a high cube flat rack.

How much weight can a flat rack carry?

Around 42,000 kg for a 20ft and 49,000 kg for a 40ft high cube flat rack, depending on the design.