Shipping Container Sizes Explained: 20ft vs 40ft Comparison

Size is one of the most fundamental decisions when purchasing a shipping container. Get this wrong, and you'll either waste money on excess capacity or discover you don't have enough space when your project is underway. This guide breaks down the dimensions, capacity, and use cases for every standard container size.

The Two Standard Shipping Container Sizes

The international shipping industry standardized on two sizes: 20 feet and 40 feet (measured in units called TEUs—Twenty-foot Equivalent Units). These are the only sizes you should consider for general commercial use. While non-standard sizes exist, they're specialty items with limited availability and higher costs.

20-Foot Container: Full Specifications

Exterior Dimensions

• Length: 19'4" (5.87 m)
• Width: 8'0" (2.44 m)
• Height (Standard): 8'6" (2.59 m)
• Height (High Cube): 9'6" (2.90 m) — rarely seen in 20ft but available

Interior Dimensions

• Length: 19'0" (5.79 m)
• Width: 7'8" (2.35 m)
• Height (Standard): 7'10" (2.39 m)
• Height (High Cube): 8'10" (2.70 m)

Capacity

• Cubic Capacity: 1,170 cubic feet (33 CBM)
• Weight When Empty: 5,071 lbs (2,300 kg)
• Maximum Load Weight: 62,130 lbs
• Safe Working Capacity: 50,000 lbs recommended for used containers

Typical Uses

• Small business storage (retail inventory, records)
• Personal storage solutions
• Equipment storage for construction or trades
• Mobile offices or workspace
• Container homes or ADU (Accessory Dwelling Units)
• Pop-up retail or food service
• Backup storage during renovation or transition

40-Foot Container: Full Specifications

Exterior Dimensions (Standard Height)

• Length: 39'5" (12.01 m)
• Width: 8'0" (2.44 m)
• Height: 8'6" (2.59 m)

Interior Dimensions (Standard Height)

• Length: 39'0" (11.89 m)
• Width: 7'8" (2.35 m)
• Height: 7'10" (2.39 m)

40-Foot High Cube Container (Extra Height)

High Cube containers are standard 40-foot containers with an additional 12 inches of height, making them ideal when you need maximum volume without using extra footprint. You can browse live 40ft high cube listings and prices to see how the extra volume is priced.

• Exterior Height: 9'6" (2.90 m)
• Interior Height: 8'10" (2.70 m)
• Cubic Capacity: 2,694 cubic feet (76.3 CBM)
• Weight When Empty: 8,600 lbs (3,900 kg)

Standard 40-Foot Container Capacity

• Cubic Capacity: 2,385 cubic feet (67.7 CBM)
• Weight When Empty: 8,268 lbs (3,750 kg)
• Maximum Load Weight: 58,930 lbs
• Safe Working Capacity: 55,000 lbs recommended for used containers

Typical Uses

• Medium-to-large business storage
• Warehouse or distribution center backup
• Fleet equipment storage
• Container homes or larger residential projects
• Farm equipment storage
• Shipping container retail spaces
• Manufacturing or workshop space
• Disaster relief or emergency shelter

20ft vs 40ft Detailed Comparison

Metric	20-Foot	40-Foot Standard	40ft High Cube
Interior Length	19 ft	39 ft	39 ft
Interior Width	7'8"	7'8"	7'8"
Interior Height	7'10"	7'10"	8'10"
Total Cubic Feet	1,170	2,385	2,694
Empty Weight	5,071 lbs	8,268 lbs	8,600 lbs
Max Payload	62,130 lbs	58,930 lbs	58,600 lbs
Cost (Used CW)	$2,200-$3,500	$3,800-$5,500	$4,200-$6,200
Cost per Cubic Foot	$1.88-$2.99	$1.59-$2.31	$1.56-$2.30

How Much Space Do You Actually Need?

Understanding raw dimensions is one thing; visualizing what fits is another. Here's how much stuff actually fits in each container:

20-Foot Container Real-World Capacity

• Office Furniture: 100-150 cubic feet fits a complete office setup (desks, chairs, filing cabinets, shelves)
• Household Furniture: A 20-footer holds the complete contents of a 2-3 bedroom house
• Pallets: Approximately 10-12 pallets (48"x40" standard pallets stacked 3-4 high)
• Vehicles: One full-size vehicle or motorcycle fits with room for additional items

40-Foot Container Real-World Capacity

• Pallets: 20-24 standard pallets, depending on stacking configuration
• Household Furniture: Contents of 4-6 bedroom house comfortably
• Vehicles: Two full-size vehicles can fit (side-by-side or end-to-end)
• High Cube Advantage: Additional 309 cubic feet of space (roughly 13% more capacity)

Which Size Should You Choose?

Choose a 20-Footer If:

• You have limited space (narrow driveway, small lot)
• Your storage needs are modest (under 1,000 cubic feet)
• You're creating a small office or workshop
• You're building a one-bedroom ADU or container home
• You want maximum maneuverability and delivery flexibility
• Budget is the primary constraint — see live 20ft listings and prices for a realistic baseline

Choose a 40-Foot Standard If:

• You need 2,000-2,500 cubic feet of space
• You're storing significant inventory or equipment
• You have good site access (can accommodate 40ft length)
• You want the best value per cubic foot
• You're building a larger residential project or commercial space

Choose a 40-Foot High Cube If:

• You need maximum volume on limited footprint
• You're storing tall equipment or items (forklifts, HVAC units)
• Vertical space matters more than ground footprint
• You can afford the 20-30% premium over standard 40-footer

Don't Forget: Interior vs. Exterior Dimensions

One mistake many customers make is confusing interior and exterior dimensions. A 40-foot container is 39'5" on the outside but only 39'0" on the inside. The walls take up about 4 inches of width on each side. If you're planning to load or access items length-wise, remember you have approximately 39 feet, not 40 feet.

This matters when loading long items like lumber, steel beams, or equipment. Always think in interior dimensions when planning what goes inside.