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Standard dimensions and size charts.
Measure smart
What to measure.
Four numbers decide nearly every fit check. Get these right and the rest follows.
- 01Width, depth, and height of the item, taken at the widest points, including feet, arms, handles, and headboards.
- 02The clear opening of the space, not the frame. A 36-inch door gives roughly 32 inches once the door and stops are accounted for.
- 03The item's smallest dimension. It decides whether tilting or turning it on its side gets it through.
- 04Diagonal clearance at turns, landings, and corners, where the real bottleneck usually is.
Don't make these
Common mistakes.
Most “it didn't fit” stories trace back to one of these oversights.
- ⚠Trusting a brochure or nominal size instead of measuring the real item and the real opening.
- ⚠Forgetting that feet, arms, and handles add to the nominal size printed on the box.
- ⚠Treating a soft mattress and a rigid frame the same. One compresses, the other does not.
- ⚠Planning the doorway but ignoring the turn at the top of the stairs.
Run a check
Check your exact item.
Reference tables tell you the standard. The calculator tells you whether your item clears your space.