Technical Reference

Container Size Guide

Choosing the right container size is essential for optimizing cargo fit, transport efficiency, and cost-per-unit. This guide compares the main ISO dry container formats used worldwide.

Global container sourcing

ISO format references

Practical logistics guidance

At a Glance

Quick Container Size Overview

The three standard ISO container formats cover the vast majority of global shipping and storage needs. Here is how they compare.

Container

External

Volume

Max Payload

Best For

20ft Dry (20DC)

6.06 × 2.44 × 2.59 m

External

6.06 × 2.44 × 2.59 m

Volume

m³

Max Payload

28,000

Heavy & dense cargo, confined sites, road weight compliance

40ft Dry (40DC)

12.19 × 2.44 × 2.59 m

External

12.19 × 2.44 × 2.59 m

Volume

m³

Max Payload

26,700

General cargo, consumer goods, palletized freight

40ft High Cube (40HC)

12.19 × 2.44 × 2.90 m

External

12.19 × 2.44 × 2.90 m

Volume

m³

Max Payload

26,600

Light bulky cargo, furniture, textiles, volume-optimized loads

20DC specifications 40DC specifications 40HC specifications

Dimensional Reference

Length Comparison, 20DC vs 40DC

A 40ft container is exactly twice the length of a 20ft, offering significantly higher cargo volume for large shipments.

Technical View

Real-World Scale

20DC, 6.06 mvs40DC, 12.19 m

Height Reference

Height Comparison, 40DC vs 40HC

Standard containers such as the 20DC and 40DC share the same external height of 2.59 m. High Cube containers (40HC) provide an additional 30 cm of vertical clearance, increasing the total height to 2.89 m. This extra height is commonly used for palletized cargo and bulky goods.

Technical View

Real-World Scale

20DC / 40DC, 2.59 mvs40HC, 2.89 m

Decision Framework

How to Choose the Right Container Size

The right container size depends on volume, cargo density, transport constraints, and handling requirements. Use these guidelines to match your cargo to the optimal format.

Choose 20DC When

Cargo Is Heavy or Sites Are Confined

The 20ft container is the workhorse for dense, heavy cargo, offering the highest payload-to-volume ratio. Its compact footprint fits tight construction sites, narrow depot yards, and road infrastructure with strict weight limits.

Dense industrial materials: steel, tiles, machinery
Weight-sensitive road transport (20-ton truck limits)
Compact storage on confined sites
Heavy project cargo and breakbulk shipments

Choose 40DC When

Standard Volume Is Sufficient

The 40ft dry container doubles the volume of a 20DC at the same height. Ideal for general cargo, consumer goods, and palletized freight where standard internal height is adequate.

General mixed cargo and consumer goods
Palletized freight at standard height
Cost-efficient volume for medium-density loads

Choose 40HC When

Volume Optimization Is the Priority

The 40ft High Cube adds 30 cm of internal height over the 40DC, increasing volume to 76 m³. This makes it the standard choice for volume-sensitive cargo, furniture, textiles, automotive parts, and any shipment where cubing out before weighing out is the norm.

Furniture, textiles, and light manufactured goods

Garments and retail merchandise

Automotive parts and components

Any cargo that fills by volume before weight

Key decision lens: container selection should always balance volume requirements, weight constraints, transport mode compatibility, and total logistics cost.

Side-by-Side

Container Size Comparison

Complete technical specifications based on ISO 668 standards. All measurements represent standard manufacturing tolerances.

Specification	20ft Dry (20DC)	40ft Dry (40DC)	40ft High Cube (40HC)
External Dimensions	6.06 × 2.44 × 2.59 m	12.19 × 2.44 × 2.59 m	12.19 × 2.44 × 2.90 m
Internal Dimensions	5.90 × 2.35 × 2.39 m	12.03 × 2.35 × 2.39 m	12.03 × 2.35 × 2.70 m
Internal Volume	33 m³	67 m³	76 m³
Tare Weight	2,200 kg	3,800 kg	3,900 kg
Max Payload	28,000 kg	26,700 kg	26,600 kg
Door Opening	2.34 × 2.28 m	2.34 × 2.28 m	2.34 × 2.58 m
Floor Area	13.9 m²	28.3 m²	28.3 m²

All specifications follow ISO 668 and CSC certification standards. Minor variations may exist between manufacturers.

Practical Applications

Typical Cargo by Container Size

What actually goes inside each container format, real-world cargo examples from global trade and logistics operations.

20ft Dry (20DC)

33 m³ · 28,000 kg payload

The 20ft container is ideal for dense cargo where weight limits are reached before volume capacity. It is commonly used for machinery, metals, tools, and compact industrial shipments.

Heavy machinerySteel productsTools & equipmentConstruction materialsDense manufactured goodsSpare partsSmall industrial shipments

40ft Dry (40DC)

67 m³ · 26,700 kg payload

The 40ft standard container doubles the length of a 20ft container while maintaining the same height. It is widely used for general cargo and palletized freight.

Palletized consumer goodsRetail shipmentsAutomotive partsFood productsElectronicsHousehold appliancesBuilding materials

40ft High Cube (40HC)

76 m³ · 26,600 kg payload

The 40ft High Cube container provides an additional 30 cm of internal height compared to a standard container, increasing cubic capacity for bulky or lightweight cargo.

FurnitureTextiles & garmentsPlastic productsLightweight bulk cargoMattressesPackaging materialsE-commerce shipments

Operational Intelligence

Logistics Considerations by Size

Beyond dimensions, container size impacts transport costs, handling requirements, and operational flexibility.

Weight vs Volume

20DC: best cost/kg ratio for dense cargo. 40HC: best cost/m³ ratio for light goods. The decision depends on whether your cargo weighs out or cubes out first.

Pallet Capacity

20DC fits 10-11 standard EUR pallets. 40DC/40HC fits 23-24 pallets. The 40HC adds ~13% volume per pallet position vs 40DC thanks to extra stacking height.

Transport & Handling

20DC is easier to handle with standard forklifts. 40ft units require side-loaders or reach stackers. Road weight limits in some regions favor 20DC over 40ft formats.

Cost Efficiency

Per-unit shipping costs are lower for 40ft containers. But total cost depends on cargo density, a half-empty 40HC is less efficient than a full 20DC.

Common Questions

Frequently Asked Questions

A 20ft container is roughly half the length of a 40ft container (6m vs 12m). The 20ft is ideal for heavy, dense cargo while the 40ft offers double the volume for general freight.

HC stands for High Cube. A 40HC container is one foot (30cm) taller than a standard 40ft container, providing approximately 13% more internal volume.

A 40HC container can fit approximately 25 standard euro pallets (120×80cm) on the floor. Double-stacking allows up to 50 pallets depending on cargo weight.

The maximum gross weight for a standard 20ft container is approximately 30,480 kg. Subtracting the tare weight of 2,200 kg, the maximum payload is about 28,280 kg.

The 40ft High Cube (40HC) is the most popular container for SOC one-way leasing due to its maximum cubic capacity and versatility for a wide range of cargo types.

Not always. The 40HC offers more volume but weighs slightly more and may face height restrictions on certain transport modes or routes. If your cargo fits within standard height, a 40DC can be more cost-effective.

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