Will a box (31x31x31 cm) fit up 91 cm stairs?
Expert analysis
A box measuring 12 in × 12 in × 12 in likely fits up stairs, with about 1 ft 4 in to spare at the tightest point. One caveat: item is rigid and cannot be compressed, bent, or disassembled.
- Binding axis
- Stair width
- Tightest clearance
- 1 ft 4 in clear
- Result
- Review the recorded result
Here’s what we found.
Your box will likely fit through the stairway, with comfortable room to spare.
| Orientation | Width | Height | Result |
|---|---|---|---|
| ✓ chosen12 in×12 in×12 in | 1 ft 4 in | 5 ft 3 in | ✓ |
| 12 in×12 in×12 in | 1 ft 4 in | 5 ft 3 in | ✓ |
| 12 in×12 in×12 in | 1 ft 4 in | 5 ft 3 in | ✓ |
| 12 in×12 in×12 in | 1 ft 4 in | 5 ft 3 in | ✓ |
| 12 in×12 in×12 in | 1 ft 4 in | 5 ft 3 in | ✓ |
| 12 in×12 in×12 in | 1 ft 4 in | 5 ft 3 in | ✓ |
Margins shown are calculated; allow ±¼ in for tape-measure precision.
How the stair-passage check works
Stair clearance depends on the measured floor and ceiling profiles, the available width, and the carried pose.
- Retain the supplied stair measurements and distinguish vertical from perpendicular headroom.
- For a declared straight flight, check the entire item sweep at the specified fixed pitch against the floor, ceiling and located bulkheads.
- Deduct rail protrusions and the handling allowance once from the relevant clearances.
- Require measured staging that contains the whole item at both ends in the same pose before confirming the declared path.
- A failed carry strategy remains unresolved; a separately proved nominal-width obstruction can establish that the item does not fit.
Pose changes, adjoining turns and unmeasured regions are not included. Winder and spiral approximations do not prove a continuous carry path.
Dimensions
- item width
- item depth
- item height
- space widthEstimated
- space depthEstimated
- space heightEstimated
Space geometry
- Standard residential rise/run (7"/11")
- Continuous handrail on at least one side
- Landing at the bottom matches the stair width
Handling
- ±¼ in tape-measure tolerance applied
- 1.5 in handling clearance subtracted from raw margins before the verdict
- Item treated as rigid — cannot compress, bend, or disassemble.
Why we make assumptions
ItemFits fills in anything you don’t measure yourself. Whenever you see [standard], the real value in your home may differ — measure it and message us in the chat below; we’ll re-run the math.
Similar calculations
Run your own fit check
Ask about a different item, door, or route. Free, no signup.