Use nominal size for planning, then verify the exact unit before loading.
Interior dimensions, door openings, tare weight and payload vary by manufacturer and condition. Measure critical equipment.
Recommendations that survive an active jobsite.
Standard dry containers are commonly 8FT wide externally. Standard height is commonly 8FT 6IN, while high cube is commonly 9FT 6IN.
Interior length and height are smaller because of wall, roof and floor construction.
Door opening height is lower than the interior height. The doorway, not the center of the box, controls tall equipment entry.
Published values vary slightly by manufacturer and series. Treat the exact unit specification as controlling.
Use the tradeoffs, not a generic rule.
| Type | Nominal exterior length | Nominal exterior height | Approx. floor area |
|---|---|---|---|
| 20FT standard | 20FT | 8FT 6IN | 160 sq ft |
| 40FT standard | 40FT | 8FT 6IN | 320 sq ft |
| 40FT high cube | 40FT | 9FT 6IN | 320 sq ft |
Working checklist.
Assign an owner, record exceptions and close the loop before the next phase begins.
- Measure the stored item at its widest fixed point
- Include handles, guards and packaging
- Check door opening width and height
- Check turning space outside doors
- Check interior aisle
- Verify exact unit specification
Common mistakes that create cost later.
Using exterior height as door height
Assuming every 40FT unit has identical tare weight
Planning zero clearance around equipment
Ignoring floor transition and loading ramp angle
Short answers before you act.
Why do online dimensions differ?
Manufacturing series and measurement conventions differ slightly. Use published dimensions for planning, then verify the specific unit before a tight fit.
Is high cube wider?
No. The common difference is one additional foot of exterior height.
Rules and specifications used in this guide.
Always confirm the current rule with the authority having jurisdiction and the exact specification for the container being purchased.