External Dimensions of a Standard 20ft Shipping Container
The external dimensions of a standard 20ft ISO container are defined by international standards (ISO 668:2020). These measurements are consistent across most manufacturers and are used for transport calculations, stacking, and securing containers on ships, trucks, and trains.
| Dimension | Metric (mm) | Imperial (ft) |
|---|---|---|
| Length | 6,058 | 20.00 |
| Width | 2,438 | 8.00 |
| Height (standard) | 2,591 | 8.50 |
Note that these are nominal figures. Actual manufacturing tolerances can add or subtract a few millimeters (see Dimensional Tolerances and Variations below).
Internal Dimensions: The Space You Actually Get
Because the container’s walls, roof, and floor have thickness, the internal length, width, and height are smaller. The exact internal 20ft shipping container dimensions vary slightly by manufacturer, but typical values are:
| Dimension | Metric (mm) | Imperial (ft & in) |
|---|---|---|
| Internal length | 5,898 | 19′ 4.2″ |
| Internal width | 2,352 | 7′ 8.6″ |
| Internal height (standard) | 2,393 | 7′ 10.2″ |
For high-cube 20ft containers (one extra foot tall), the external height is 2,896 mm (9.5 ft), and the internal height rises to about 2,698 mm (8′ 10.2″), but the length and width remain unchanged.
Door Opening Dimensions
Door opening size is often overlooked, but it dictates the maximum dimensions of a load that can pass through the doors. The standard double rear doors of a 20ft container provide an opening approximately:
| Dimension | Metric (mm) | Imperial (ft & in) |
|---|---|---|
| Door width | 2,340 | 7′ 8.1″ |
| Door height (standard) | 2,280 | 7′ 5.7″ |
For high-cube containers, the door height increases to about 2,585 mm (8′ 5.8″), following the taller internal height.
Capacity and Payload: What Can a 20ft Container Carry?
Capacity has two main numbers: cubic capacity (volume) and payload (maximum cargo weight). The container’s own weight (tare) subtracts from the maximum gross weight to determine payload.
- Cubic capacity: About 33.2 m³ (1,172 ft³) for a standard 20ft container.
- Tare weight: Typically 2,200–2,300 kg (4,850–5,070 lbs), varying by manufacturer and floor type.
- Maximum gross weight: 30,480 kg (67,200 lbs) under ISO standard, though some containers are rated lower (e.g., 24,000 kg).
- Available payload: Gross weight minus tare weight. Using a 30,480 kg gross and 2,300 kg tare gives a payload of about 28,180 kg (62,130 lbs).
| Weight Component | Metric (kg) | Imperial (lbs) |
|---|---|---|
| Max gross weight (typical) | 30,480 | 67,200 |
| Tare weight (approx.) | 2,300 | 5,070 |
| Payload (cargo + packing) | ~28,180 | ~62,130 |
Always check the CSC plate on the specific container for its actual rating; road weight limits in some regions may further restrict how much you can carry.
Dimensional Tolerances and Variations
Manufacturing tolerances for steel containers are typically within ±5 mm for length and width, and ±10 mm for height. Small differences in floor thickness or door seals can shift internal dimensions. If exact interior space is critical (e.g., for a tight-fit racking system), measure the actual container before building around it. Also, note that open-top, flat-rack, and refrigerated 20ft containers can have radically different internal dimensions – consult the manufacturer’s spec sheet for those.
Realistic Loading Example: How Many Pallets Fit?
Let’s put the internal dimensions to work. The most common pallet sizes used in international trade are the Euro pallet (1,200 mm × 800 mm) and the ISO pallet (1,200 mm × 1,000 mm). Because the internal width of a 20ft container is about 2,352 mm, you can fit two Euro pallets side by side (800 mm + 800 mm = 1,600 mm, leaving room to spare) or two ISO pallets side by side (1,000 mm + 1,000 mm = 2,000 mm). The internal length of 5,898 mm allows:
- Euro pallets: 10 pallets, arranged in two rows of five (each row: 5 × 1,200 mm = 6,000 mm, which is extremely tight; in practice, many loaders position 10 pallets with the long sides parallel to the container’s length, or 11 using specialized pallet grids).
- ISO pallets: 10 pallets in two rows of five, same as Euro pallets when turned lengthwise (1,200 mm deep) – very common for 20ft containers.
If using standard 48″ × 40″ pallets (1,219 mm × 1,016 mm), you can fit 10 pallets in two rows, though a gap remains along the wall. The door opening’s width (2,340 mm) is sufficient for loading both rows.
Key Takeaways
- External 20ft shipping container dimensions are 6,058 × 2,438 × 2,591 mm (standard height).
- Usable internal space is about 5,898 × 2,352 × 2,393 mm.
- Door opening is roughly 2,340 mm wide × 2,280 mm high.
- Cubic capacity ≈ 33.2 m³; payload typically around 28,000 kg (62,000 lbs), depending on tare and gross rating.
- Always confirm the actual CSC plate data and measure the container for projects demanding tight tolerances.
Frequently Asked Questions
What is the maximum gross weight of a 20ft shipping container?
The ISO standard maximum gross weight is 30,480 kg (67,200 lbs). Some older containers are rated lower (24,000 kg or 27,000 kg). Check the CSC safety approval plate on the door for the precise rating.
How many cubic meters can a 20ft container hold?
A standard 20ft container offers approximately 33.2 m³ of internal volume. A high-cube version provides roughly 37.3 m³.
What's the difference between capacity and payload?
Capacity usually refers to volume (how much space), while payload refers to the maximum cargo weight the container can safely carry (gross weight minus the container’s own tare weight).
Can I load 11 Euro pallets in a 20ft container?
In standard practice, 10 Euro pallets fit easily. Specialised loading grids or slightly higher tolerance in some containers can sometimes accommodate 11, but it is not guaranteed. Always mock-load high-value shipments.
Do all 20ft containers have the same interior width?
The interior width is typically 2,352 mm, but manufacturing tolerances can cause a few millimeters of variation. Some special-purpose containers (e.g., refrigerated units) are narrower due to insulation.
Is the 20ft shipping container dimensions different for high-cube models?
Yes. High-cube 20ft containers are exactly one foot taller: external height 2,896 mm, internal height about 2,698 mm. Length and width remain the same as standard containers.
Why do the door dimensions matter?
The door opening is the gateway for your cargo. If a pallet or crate is taller or wider than the door opening, it cannot be loaded through the end doors, even if it fits inside the container’s length and width.