Will a king mattress (76"×80"×12") (193x203x25 cm) fit through an 81 cm door?

Question

Accepted Answer

A king mattress (76"×80"×12") measuring 76 in × 80 in × 10 in fits through a door, with about 2.5 in to spare at the tightest point. The binding dimension is height: in its best-fitting orientation, the height is what comes closest to the limit, and it still clears. We checked every orientation and confirmed at least one places the king mattress (76"×80"×12") fully inside without compression or disassembly. That margin already subtracts a 1.5 in handling allowance, so it reflects a realistic load rather than a paper-thin theoretical fit. One caveat: applied practical clearance for handling (see tolerance buffer above).

Orientation	Width	Height	Result	Note
✓ chosen0.83×6.33 ft (front/back)	1.83 ft	0.33 ft	✓
0.83×6.67 ft (sideways)	1.83 ft	0 ft	✕	Too tall
6.33×0.83 ft (front/back)	-3.66 ft	5.83 ft	✕	Too wide
6.33×6.67 ft (laid flat)	-3.66 ft	0 ft	✕	Too wide
6.67×0.83 ft (sideways)	-4 ft	5.83 ft	✕	Too wide
6.67×6.33 ft (laid flat)	-4 ft	0.33 ft	✕	Too wide

Will a king mattress (76"×80"×12") (193x203x25 cm) fit through an 81 cm door?

Expert analysis

It fits with clearance on every axis.

Dimensions

Space geometry

Handling

Similar calculations

Run your own fit check