An Alaskan king mattress is a 108 in square: 9 ft by 9 ft, or 274 × 274 cm. That’s 32 in wider and 28 in longer than a standard king, and almost twice its area: 81 square feet against 42. With a frame and 24 in of floor on both sides and past the foot, it needs a bedroom of at least about 13 ft 4 in by 11 ft 5 in.
Alaskan king bed dimensions
| Measure | Inches | Feet | Centimeters |
|---|---|---|---|
| Width | 108 in | 9 ft | 274 cm |
| Length | 108 in | 9 ft | 274 cm |
| Mattress area | 11,664 sq in | 81 sq ft | 7.5 m² |
Sleep Foundation, Saatva, Mattress Firm, Purple, Casper, Amerisleep, Nolah and the Alaskan King Bed Company all give 108 × 108 in. Feet, centimeters and area are conversions.
The Alaskan king is a specialty size. You buy it, its frame and its sheets from the few companies that make them, and the Alaskan King Bed Company, which sells the size, also makes a shorter and a smaller version of it: the Shorty, 108 × 80 in, as long as a king, and the Mini, 96 × 96 in.
Alaskan king vs California king and the other big beds
| Bed | Width × length | Area |
|---|---|---|
| King | 76 × 80 in | 42 sq ft |
| California king | 72 × 84 in | 42 sq ft |
| Texas king | 80 × 98 in | 54 sq ft |
| Wyoming king | 84 × 84 in | 49 sq ft |
| Alberta or Vermont king | 96 × 96 in | 64 sq ft |
| Alaskan king | 108 × 108 in | 81 sq ft |
Sizes from Sleep Foundation’s oversized mattress guide, Amerisleep, Casper and Nolah. Purple lists the Texas king as 80 × 96 in; most sources, including the Alaskan King Bed Company, give 80 × 98. Areas are our arithmetic, rounded.
Against a California king, the Alaskan king is 36 in wider and 24 in longer. The California king is the longest of the standard sizes; the Alaskan king is longer still and, like the Wyoming and Alberta kings, square. For the standard sizes, see the bed size chart.
How big a room an Alaskan king needs
Our bedroom layout planner sets a frame about 4 in bigger than the mattress each way and keeps 24 in of floor on both sides of the bed and past its foot. The same rule for an Alaskan king, with a 112 in square frame:
| Room measure | Arithmetic | Needs at least |
|---|---|---|
| Headboard wall | 24 + 112 + 24 in | 160 in (13 ft 4 in) |
| Headboard wall to the opposite wall | 1 + 112 + 24 in | 137 in (11 ft 5 in) |
| With an 18 in deep dresser across from the bed | 1 + 112 + 34 + 18 in (34 in to open its drawers and stand) | 165 in (13 ft 9 in) |
So an Alaskan king needs a room of about 13 ft 4 in by 11 ft 5 in on its own, and 13 ft 4 in by 13 ft 9 in with a dresser across from it. An average master bedroom, about 14 × 16 ft (see master bedroom size), holds both. The bedroom layout planner checks your own room with a custom bed size.
Getting it in: measure the doorways, stairs and halls on the way to the bedroom before you order. The maker’s delivery and assembly details tell you how the mattress and frame arrive.
Questions
How big is an Alaskan king bed?
108 × 108 in: a 9 ft square, or 274 × 274 cm. It’s the biggest of the oversized sizes that size charts list.
What is the size of an Alaskan king bed in feet?
9 ft by 9 ft, 81 square feet of mattress.
Is an Alaskan king bigger than a California king?
Much bigger: 36 in wider and 24 in longer. A California king is 72 × 84 in.
Is there a bed bigger than an Alaskan king?
Some makers build family beds bigger still. The Alaskan King Bed Company’s Biggie is 144 × 108 in. These are custom sizes rather than a standard one.
Sources
- Sleep Foundation, Alaskan king bed dimensions and oversized mattresses: Alaskan, Alberta, Wyoming and Texas kings
- Alaskan King Bed Company, buyer’s guide: 9 × 9 ft; the Shorty, Mini and Biggie sizes; Texas king 80 × 98 in
- Saatva, guide to mattress dimensions and Mattress Firm, mattress sizes: 108 × 108 in
- Amerisleep, Wyoming vs Alaskan vs Texas king, Casper, mattress size comparison and Purple, mattress sizes: the other oversized beds
- Sleep Foundation, Mattress Sizes 101: king 76 × 80 in, California king 72 × 84 in
Sizes checked October 20, 2026. Room sizes follow our bedroom layout planner’s rules. Feet, centimeters and areas are conversions.