by The California King (72" x 84") is the right choice for most shoppers: it fits tall sleepers and couples, costs far less than an Alaskan King, and is available from virtually every mattress brand. The Alaskan King (108" x 108") is a custom-order specialty size for families that co-sleep in a very large room. For the mattress itself, the Saatva Classic is our top recommendation for either size, with a 365-night trial and lifetime warranty.
Saatva Classic
9.2/10
- Dual-coil construction delivers excellent support and airflow across large king dimensions
- Three firmness options (Plush Soft, Luxury Firm, Firm) suit couples with different sleep preferences
- Free white-glove delivery, professional setup, and old-mattress removal included
- 365-night home trial and lifetime warranty are rare at this price point
- Priced above many bed-in-a-box alternatives (queen MSRP ~$2,229)
- Not available in Alaskan King (custom 108" x 108") — max standard size is California King
Whether you settle on a California King or explore oversized custom options, the Saatva Classic is the strongest innerspring hybrid we've tested in the large-bed category. The long trial window means you can confirm the fit in your actual bedroom before committing.
Alaskan King vs California King: the numbers
| Alaskan King | California King | |
|---|---|---|
| Dimensions | 108" x 108" (9' x 9') | 72" x 84" (6' x 7') |
| Surface area | 11,664 sq in (81 sq ft) | 6,048 sq in (42 sq ft) |
| Per-person width (couple) | 54" each | 36" each |
| Sleeper capacity | 4 adults or 2 adults + 3-4 children | 2 adults + 1 child or pet |
| Minimum room size | 16' x 16' | 12' x 10' |
| Availability | Custom order only | All major brands |
| Price range | $3,000–$10,000+ | Standard mattress pricing |
| Sheet sets | Custom-made ($200–$500+) | Widely available |
What is an Alaskan King bed?
An Alaskan King is a square specialty bed measuring 108 inches by 108 inches (9 feet x 9 feet). It is the largest widely-discussed bed size in the US, covering 81 square feet of sleeping surface, roughly the size of a small studio bathroom. The name is informal — no official bedding standard governs it — and virtually all Alaskan King mattresses and frames are custom-manufactured.
That custom status has practical consequences. Standard doorways are 30–36 inches wide; an Alaskan King mattress cannot pass through them in one piece. Sheets and bed frames must be made to order. And because few factories produce them at scale, prices typically start around $3,000 and can exceed $10,000 for premium materials.
Who actually needs an Alaskan King?
The Alaskan King makes sense for a narrow set of buyers: families that intentionally co-sleep with multiple children, individuals who share a bed with one or more large dogs, or couples in a very large primary suite (minimum 16' x 16') who want each person to have as much personal space as a twin bed (54" wide per side). For everyone else, the size is impractical, expensive, and difficult to accessorize.
Alaskan King pros and cons
- Pro: Unmatched sleeping surface — 27 square feet more than a California King
- Pro: Each sleeping partner gets 54" of width, more than a twin XL
- Pro: Family co-sleeping with multiple children or pets becomes practical
- Con: Custom order only, often with 4–8 week lead times
- Con: Cannot fit through standard 30–36" interior doorways
- Con: Sheets, duvet covers, and frames must all be custom-made
- Con: Requires a bedroom of at least 16' x 16' for reasonable clearance
What is a California King?
The California King measures 72 inches wide by 84 inches long. It is a standard size, stocked by every major mattress brand, compatible with widely available sheets and bed frames, and fits through standard doorways without issue. The Cal King is 4 inches narrower than a standard King (76" x 80") but 4 inches longer, making it the preferred choice for sleepers over 6'2" who sleep with a partner.
Despite what the name implies, a California King is actually narrower than a standard King. Many first-time buyers are surprised by this. If width is your priority, a standard King gives each partner 38 inches vs. the Cal King's 36 inches. If length is your priority — because you or your partner are tall — the Cal King is the better fit.
Who should buy a California King?
The California King is the right choice for: couples where one or both partners are tall (above 6'2"), households that want more space than a standard King without the custom-order complexity of an Alaskan King, and anyone who values the full ecosystem of standard-size bedding, frames, and accessories. It is also significantly cheaper than any oversized custom size.
California King pros and cons
- Pro: Standard size — available from all major mattress brands at normal retail prices
- Pro: Extra length (84") suits tall sleepers (6'2" and above)
- Pro: Wide sheet and frame ecosystem
- Pro: Fits through standard doorways and in typical large bedrooms
- Con: 4" narrower than a standard King (72" vs. 76")
- Con: Cannot accommodate an entire family the way an Alaskan King can
Key differences: Alaskan King vs California King
Size and sleeping space
The Alaskan King offers nearly twice the surface area of a California King: 11,664 square inches vs. 6,048 square inches. In practical terms, a couple on an Alaskan King each gets 54 inches of width — more than a twin XL. On a California King, each partner gets 36 inches, which is comparable to a twin.
Availability and logistics
California Kings are a standard retail size. You can order one tonight and receive it within a week from most online brands, including split Cal King options for adjustable bases. Alaskan Kings are custom orders with typical 4–8 week lead times, and installation requires careful advance planning around doorway widths and room layout.
Accessories and bedding
Cal King sheets are sold at Target, Bed Bath & Beyond, and every major online retailer, usually for $40–$200 per set. Alaskan King sheets must be custom-sewn; expect $200–$500+ per set with fewer design options. The same applies to duvet covers, mattress protectors, and bed skirts.
Price
A quality California King mattress from a reputable brand starts around $1,000–$1,500. The Saatva Classic in Cal King runs approximately the same as the queen price. Alaskan King mattresses start around $3,000 for basic foam and can exceed $10,000 for premium materials — and that's before the custom frame and custom bedding.
Room requirements
A California King in a 12' x 10' room leaves enough clearance to walk around the bed and open a dresser. An Alaskan King requires a minimum of 14' x 14', and 16' x 16' is more comfortable. Standard American bedrooms average 10' x 12', which means an Alaskan King is genuinely unsuitable for most homes.
How the Alaskan King compares to other oversized sizes
| Size | Dimensions | Per-person width (couple) | Availability |
|---|---|---|---|
| California King | 72" x 84" | 36" each | All major brands, standard retail |
| Wyoming King | 84" x 84" | 42" each | Limited specialty manufacturers |
| Texas King | 80" x 98" | 40" each | Custom order only |
| Alaskan King | 108" x 108" | 54" each | Custom order only |
The Wyoming King (84" x 84") sits between a Cal King and Alaskan King in both size and price, with a growing number of specialty makers offering it. It is a viable middle ground for families that want more room than a Cal King but aren't ready for the full 9-foot Alaskan King commitment.
Which size should you buy?
For the vast majority of buyers, the answer is the California King. It is available immediately from every major brand, fits in most large bedrooms, uses standard accessories, and costs a fraction of a custom Alaskan King. It also comes in split Cal King configurations for couples who want separate adjustable bases.
The Alaskan King is worth considering only if you have a bedroom of at least 14' x 14', a specific co-sleeping arrangement that genuinely requires 9 feet of width, and a budget of $5,000–$15,000+ for the complete setup (mattress, custom frame, custom bedding). If those conditions apply, the size delivers an experience nothing else can match.
Whichever size you choose, pick a mattress with a long trial window. A bed this large is a major commitment, and the only way to know if a mattress works for your body is to sleep on it for 60–90 nights in your own bedroom.
The California King is the practical choice for most shoppers. Go Alaskan King only if you have a 14'+ bedroom, a co-sleeping family, and a custom-order budget. For the mattress itself, the Saatva Classic offers the best combination of support, trial length, and warranty for large-format sleeping.
Frequently asked questions
Is an Alaskan King bed bigger than a California King?
Yes, significantly. An Alaskan King is 108" x 108" (9 feet square), covering 81 square feet. A California King is 72" x 84", covering 42 square feet. The Alaskan King is nearly twice the surface area and 36 inches wider in each direction.
What is the biggest standard mattress size available?
The California King (72" x 84") is the largest standard retail size, available from all major brands. Above that, Wyoming King (84" x 84"), Texas King (80" x 98"), and Alaskan King (108" x 108") are all specialty or custom sizes with limited availability.
Does Saatva make an Alaskan King mattress?
No. Saatva's largest standard size is the California King (72" x 84"). Like most established mattress brands, they do not manufacture the custom 108" x 108" Alaskan King size. Alaskan King mattresses must be sourced from specialty custom manufacturers.
Is a California King wider than a King?
No — this is a common misconception. A standard King is 76" x 80", which is 4 inches wider than a California King (72" x 84"). The California King trades width for length, making it better for tall sleepers but slightly narrower for each partner.
What sheets fit an Alaskan King?
Alaskan King sheets must be custom-made. No retail bedding brand stocks this size. Expect to pay $200–$500+ per set for custom-sewn sheets, with limited design options and longer production lead times.