Will a King mattress (76"×80"×12") (193x203x25 cm) Fit Through a 91 cm Door?

Will a King mattress (76"×80"×12") (193x203x25 cm) Fit Through a 91 cm Door?

−3 ft 4 in over

· ON THE WIDTH AXIS

It exceeds the opening at the tightest point.

Your king mattress (76"×80"×12") will not clear the space — but only just — it is a hair over the limit at the tightest point. The passage is the limiting constraint.

Handling: The item exceeds the space in every orientation — standard entry won't work.

6 ft 4 in vs 36 in

Overage −3 ft 4 in (−111.2%) on the WIDTH axis

Axis-aligned check (before rotation)
✕	WIDTH	6 ft 4 in	>	36 in	−3 ft 4 in	(−111.2%)
—	DEPTH	not applicable (2D opening — door)
—	HEIGHT	not applicable

Orientation	Width	Height	Result
✓ chosen254mm (smallest dimension)	—	—	✓

Margins shown are calculated; allow ±¼ in for tape-measure precision.

How the door-passage check works

A door is a 2D opening — width and height matter; depth (path length through the doorway) doesn’t.

Generate all 6 dimension permutations of the item (3 axes × 2 flips).
For each permutation, apply the door constraint: item_width ≤ door_width AND item_height ≤ door_height.
Subtract 1.5 in handling clearance from each axis to leave room for human movement.
Pick the permutation with the largest minimum-axis margin — that’s the orientation a mover would choose.
Verdict ladder (verdict-tiers.js): FITS if margin ≥ 2 in; FITS_TIGHT if 0.5–2 in; FITS_VERY_TIGHT if 0–0.5 in; DOESN'T_FIT below.

Tolerance ±¼ in (6 mm) is applied implicitly (band promotion to FITS_VERY_TIGHT) — see the note below the orientation matrix.

Similar calculations

6 ft King mattress (76"×80"×12") through a 32 in doorwayFITS

5 ft Queen mattress (60"×80"×12") through a 36 in doorwayDOESN'T FIT

35 in 112xsofa through a 32 in doorwayDOESN'T FIT

36 in Standard bookshelf (36"×12"×72") through a 6 ft doorwayFITS

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