Alaskan King vs. California King: Size, Room and Cost Compared
The Alaskan King is much bigger. At 108 × 108 in (274 × 274 cm), it is 36 in wider and 24 in longer than a California King (72 × 84 in (183 × 213 cm)), with 81 sq ft of surface against 42: 93% more, by our calculation.
Key takeaways. The Alaskan King is 36 in wider and 24 in longer than a California King, with almost twice the surface. A California King is not bigger than a standard King, just longer. Nothing from a California King bed carries over: frame, sheets and comforter all have to be re-bought in 108 × 108 in. For the Alaskan King's own measurements in feet and cm, see Alaskan King bed size.
Side by side
| California King | Alaskan King | |
|---|---|---|
| Inches | 72 × 84 in | 108 × 108 in |
| Centimeters | 183 × 213 cm | 274 × 274 cm |
| Feet | 6 ft × 7 ft | 9 ft × 9 ft |
| Surface | 42 sq ft | 81 sq ft |
| Width per sleeper, 2 people | 36 in | 54 in |
| Width per sleeper, 4 people | 18 in | 27 in |
| Min. room (30 in walkways)* | 11 × 9.5 ft | 14 × 11.5 ft |
| Shape | Rectangle, longer than wide | Square |
| Size type | Standard US size | Oversized, from a few specialist makers |
*Our calculation: bed plus 30 in of walking space on both sides and at the foot. Sleeper widths: mattress width divided by the number of sleepers.
Is a California King bigger than a King?
Not really (every King size in inches and cm). A California King (72 × 84 in) is 4 in longer but 4 in narrower than a standard King (76 × 80 in), and has slightly less surface: 42 against 42.2 sq ft. It suits tall sleepers, not bigger families. If you want a bed that is genuinely bigger in both directions, you have to move to the oversized sizes: Wyoming King (84 × 84 in), Alberta King (96 × 96 in) or Alaskan King (108 × 108 in).
Who each size is for
- California King: one or two adults, especially tall ones, in a normal-size bedroom. Easy to find sheets, frames and mattresses for.
- Alaskan King: couples who share the bed with children or large dogs, or anyone who wants a lot of space each, in a large bedroom.
- In between: a Wyoming King (84 × 84 in) has the length of a California King and 12 in more width.
Room and delivery
The California King fits in a room of about 11 × 9.5 ft with comfortable walkways; the Alaskan King needs about 14 × 11.5 ft (our calculation). A California King is one of the standard US mattress sizes; an Alaskan King has to be folded or rolled to get through a door, and its frame has to be bought in that exact size. Our guide on whether an Alaskan King will fit in your room covers doors and stairs.
Sheets and bedding
California King sheets are sold everywhere. Alaskan King sheets (108 × 108 in) come from the oversized-bed specialists: bedding made for this size was listed from $290 to $1,400 per item on October 5, 2026. California King sheets will not fit an Alaskan King: they are 36 in too narrow and 24 in too short.
Cost
An Alaskan King mattress was listed from $3,300 on the makers' own sites on October 5, 2026, and a frame from $2,300. Ours, shipping included: Alaskan King mattresses from $4,389. The full maker-by-maker breakdown is on our Alaskan King bed price page.
The short answer
If the goal is a longer bed for one or two tall adults, a California King does the job at a normal price (or a Texas King bed: see Texas vs. Wyoming vs. Alaskan King). If the goal is more space for more people, the California King is the wrong upgrade: it is no bigger than a King. Look at the square oversized sizes instead, on the chart of the biggest bed sizes, or read Alaskan King vs. King.