One of the first things people get hung up on when buying a container is the size question. It sounds straightforward until you realize that the number on the label tells you the outside length but not much else. The inside dimensions, the weight capacity, the floor space, and the height all vary in ways that matter depending on what you are actually trying to do.
Here is a clear breakdown of the three most common sizes we sell so you can figure out which one fits your situation before you ever pick up the phone.
The 20ft Standard Container
The 20ft container is the most common size in the world and for good reason. It is the right fit for most residential storage needs, small business inventory, and situations where space or delivery access is limited.
External dimensions: Length 20 feet, Width 8 feet, Height 8 feet 6 inches.
Internal dimensions: Length 19 feet 4 inches, Width 7 feet 8 inches, Height 7 feet 10 inches.
Floor space: approximately 148 square feet.
Volume: approximately 1,169 cubic feet.
Max payload: approximately 47,900 pounds.
The 20ft container is the go-to for homeowners who need backyard storage, small businesses storing seasonal inventory or equipment, farms storing tools and supplies, and anyone who needs a container on a property where space or truck access is tight. A tilt-bed delivery truck needs less room to maneuver when dropping a 20ft versus a 40ft so if your driveway is narrow or your property has limited turning radius this is typically the easier drop.
It is also a popular choice for container home projects where a single unit is being converted into a compact living or studio space, and for mobile retail setups at markets and events.
The 40ft Standard Container
The 40ft container is the workhorse of the industry. It doubles the floor space of a 20ft and is the standard choice for contractors, larger businesses, and agricultural operations with more significant storage needs.
External dimensions: Length 40 feet, Width 8 feet, Height 8 feet 6 inches.
Internal dimensions: Length 39 feet 5 inches, Width 7 feet 8 inches, Height 7 feet 10 inches.
Floor space: approximately 302 square feet.
Volume: approximately 2,385 cubic feet.
Max payload: approximately 59,200 pounds.
The 40ft is the right size when you need to store larger equipment, multiple pieces of machinery, full pallets of material, or anything that just would not fit comfortably in a 20ft. Construction companies storing site equipment, agricultural operations protecting larger implements from the South Carolina heat and humidity, and businesses managing seasonal or overflow inventory typically land on the 40ft.
It is also the most commonly used size for container home builds and commercial conversions because the extra length gives you genuine living or working square footage to design around. Two 40ft containers combined create roughly 600 square feet of floor space which gets you into real residential territory.
One thing to plan for is delivery access. A 40ft container requires more room to drop than a 20ft and the tilt-bed truck needs a longer straight run to slide the container off safely. We will talk through access requirements with you before delivery day so nothing comes as a surprise.
The 40ft High Cube Container
The 40ft high cube is the same footprint as a standard 40ft but with one significant difference. It is a full foot taller, giving you 9 feet 6 inches of exterior height and approximately 8 feet 10 inches of interior height. That extra foot matters more than it sounds.
External dimensions: Length 40 feet, Width 8 feet, Height 9 feet 6 inches.
Internal dimensions: Length 39 feet 5 inches, Width 7 feet 8 inches, Height 8 feet 10 inches.
Floor space: approximately 302 square feet.
Volume: approximately 2,694 cubic feet.
Max payload: approximately 58,600 pounds.
That extra foot of interior height opens up use cases that a standard 40ft simply cannot handle comfortably. Anyone doing a conversion into a living space, office, or commercial structure almost always chooses a high cube because standard 8-foot ceilings inside a converted standard container feel cramped once you account for floor framing and ceiling insulation. The high cube gives you the headroom to finish the interior properly and not feel like you are ducking when you walk through.
For storage purposes the high cube is the better choice when you are storing tall equipment, stacked pallets, or anything with significant vertical height. It is also a smart pick if you are not sure exactly what you will be storing long term and want the flexibility of extra vertical space.
High cube containers do come in at a slightly higher price point than standard 40ft units but for conversions and tall-storage applications most buyers agree the difference is worth it.
How to Decide Which Size Is Right for You
A few questions help narrow it down quickly.
What are you storing and how much of it? If you can sketch out roughly what you plan to put in the container and how much floor space it would need that gets you most of the way there. A 20ft gives you about 148 square feet of floor space. A 40ft gives you about 302. If your stuff takes up more than half a two-car garage you are probably looking at a 40ft.
How tall is your tallest item? If anything you are storing is taller than six feet you will want to think about the high cube. Standard containers give you just under 8 feet of interior height which sounds like plenty until you factor in that most people stack items and need to move around inside.
Are you converting the container? If yes go with the high cube almost every time. The extra foot of interior ceiling height makes the difference between a space that feels like a finished room and one that feels like a cargo box with lights. For more on this read our breakdown of new vs used and our permit guide.
How much delivery room do you have? If your property has tight access a 20ft may be the practical choice regardless of how much storage you want. A 40ft needs more room to be placed correctly and we will assess your site before delivery to make sure it works.
If you are still not sure just call us. We have placed containers in hundreds of properties across South Carolina and neighboring states and we can usually tell you in a few minutes which size makes sense for your specific situation. We serve Charleston and the surrounding Lowcountry plus the broader Southeast.
Call us at (843) 900-4171 or visit blairworxsolutions.com to get started.
Frequently Asked Questions
What is the interior size of a 20ft shipping container?
A standard 20ft container has interior dimensions of approximately 19 feet 4 inches long, 7 feet 8 inches wide, and 7 feet 10 inches tall. That gives you about 148 square feet of floor space and 1,169 cubic feet of total volume.
What is the interior size of a 40ft shipping container?
A standard 40ft container has interior dimensions of approximately 39 feet 5 inches long, 7 feet 8 inches wide, and 7 feet 10 inches tall. That gives you about 302 square feet of floor space and 2,385 cubic feet of total volume.
What is the difference between a 40ft standard and a 40ft high cube container?
The footprint is identical but a 40ft high cube is one full foot taller, with an exterior height of 9 feet 6 inches versus 8 feet 6 inches for a standard. The extra interior height makes a significant difference for conversions, tall storage, and any application where headroom matters.
Which shipping container size is best for residential storage?
A 20ft container works well for most residential storage needs and is easier to place on properties with limited access. If you have larger storage requirements or are planning a conversion a 40ft or 40ft high cube gives you significantly more space to work with.
How much weight can a shipping container hold?
A 20ft standard container has a maximum payload capacity of approximately 47,900 pounds. A 40ft standard container holds approximately 59,200 pounds. High cube variants are comparable in payload capacity to their standard counterparts.