What Is the Biggest Bed Size?
Updated September 2026
The biggest bed you can buy from many sellers is the Alaskan King, 108" × 108" (9 feet square, 81 sq ft).
- Largest overall: Imperial King, 144" × 144" (144 sq ft). 1 seller we track.
- Largest square with many sellers: Alaskan King, 108" × 108". 15 of 19 sellers we track.
- Widest family bed: Family Bed XL, 144" × 84" (84 sq ft). 4 sellers we track.
Below is every oversized bed size compared by area, room fit and how many sellers make it.
What Is the Biggest Mattress Size You Can Buy?
The largest mattress we track is the Imperial King at 144" × 144", a 12-foot square hand-built by Delarkin in South Carolina. It is a single-maker size, so bedding and frames are custom. Wider-than-square options are the Family Bed (120" × 80", 8 sellers) and Family Bed XL (144" × 84", 4 sellers).
For most buyers, the Alaskan King at 108" × 108" is the practical largest size. 15 of the 19 sellers we track make it, and it is the biggest size where you can find ready-made bedding and frames. The Wyoming King (84" × 84") and Texas King (80" × 98") are also widely available if you need something smaller.
Largest Mattress Sizes Ranked by Area
Every oversized size, biggest first, with how many of the sellers we track make it:
| Rank | Name | Dimensions | Square Feet |
|---|---|---|---|
| 1 | Imperial King | 144" × 144" | 144 sq ft |
| 2 | Family Bed XL | 144" × 84" | 84 sq ft |
| 3 | Alaskan King | 108" × 108" | 81 sq ft |
| 4 | Family Bed | 120" × 80" | 66.7 sq ft |
| 5 | Texas King | 80" × 98" | 54.4 sq ft |
| 6 | Wyoming King | 84" × 84" | 49 sq ft |
| 7 | Alberta King | 72" × 96" | 48 sq ft |
| 8 | Standard King | 76" × 80" | 42.2 sq ft |
| 9 | California King | 72" × 84" | 42 sq ft |
Note: the fewer sellers a size has, the harder it is to find sheets, frames and replacement parts for it. Ready to buy? See every oversized bed seller we track.
All Oversized Bed Sizes Compared
| Size | Dimensions (in) | Sq Ft | |||
|---|---|---|---|---|---|
| Imperial King | 144 × 144 | 144 | |||
| Family Bed XL | 144 × 84 | 84 | |||
| Alaskan King | 108 × 108 | 81 | |||
| Family Bed | 120 × 80 | 66.7 | |||
| Texas King | 80 × 98 | 54.4 | |||
| Wyoming King | 84 × 84 | 49 | |||
| Alberta King | 72 × 96 | 48 | |||
| – Standard sizes for reference – | |||||
| California King | 72 × 84 | 42 | |||
| King | 76 × 80 | 42.2 | |||
| Queen | 60 × 80 | 33.3 | |||
Alaskan King (108" × 108")
The true giant. A perfect 9-foot square that gives every sleeper equal space in every direction. At 81 square feet, it's nearly double the surface area of a standard King. The square shape makes it ideal for families who co-sleep. Two adults and two kids fit comfortably with room to spare. Couples with large dogs also love the Alaskan King because there's enough room that nobody gets pushed to the edge.
The tradeoff: you need a big room. A 14' × 14' bedroom is recommended, and your doorways need to be wide enough for delivery (most Alaskan King mattresses ship in sections for this reason). Mattress prices range from $2,500 to $7,000+ depending on materials and seller.
Wyoming King (84" × 84")
The practical middle ground. At 7 feet square, it's significantly larger than a King but doesn't demand a mansion-sized bedroom. A 12' × 12' room works well. The square shape gives equal space on all sides, so no more fighting over who gets the narrow end.
Wyoming Kings cost less than Alaskan Kings (mattresses $1,500–$5,000) and are easier to deliver. Bedding availability is better too. For couples who want a meaningful upgrade without the extreme logistics of a 9-foot bed, this is often the sweet spot.
Texas King (80" × 98")
The choice for tall sleepers. Unlike the square Alaskan and Wyoming Kings, the Texas King is a rectangle, wider than a standard King but with extra length rather than equal proportions. At 8'2" long, it gives tall people (6'2"+) the legroom they've been missing.
If you're tall and tired of your feet hanging off the end, but you don't need a 9-foot bed, the Texas King is purpose-built for you. Mattress prices are in the $1,500–$5,000 range.
Alberta King (72" × 96")
Think of it as a wider California King. Same idea, emphasizing length for taller sleepers, but with a few extra inches of width. Not as widely available as the other oversized sizes, but offered by several specialty manufacturers including Engineered Sleep and Mattress Insider.
Imperial King (144" × 144")
The largest size we track: a 12-foot square with 144 square feet of sleeping surface, close to double an Alaskan King. Delarkin builds it by hand in South Carolina and takes orders by phone. Plan for a custom foundation and custom bedding, and a room of at least 16 by 16 feet.
Family Bed (120" × 80") & Family Bed XL (144" × 84")
Wide rectangles designed for families who want everyone in one bed. The standard Family Bed is 10 feet wide and the XL stretches to 12 feet. 8 sellers we track make the Family Bed and 4 sellers make the XL, including Taylor & Wells, whose family beds are sold through Bedding Mart.
The width is impressive but the length is standard (80" or 84"), so they're not designed for tall sleepers. They're designed for width, with room for parents and multiple kids side by side.
Which Oversized Bed Is Right for You?
- →Need maximum space in all directions? Alaskan King
- →Tall and need extra length? Texas King
- →Want bigger than a King but room isn't huge? Wyoming King
- →Family co-sleeping with kids? Family Bed
- →Want a wider California King? Alberta King
- →Budget under $3,000 for a mattress? Wyoming King or Texas King
Room Size Requirements
| Bed Size | Minimum Room | Recommended Room |
|---|---|---|
| Alaskan King (108" × 108") | 12' × 12' | 14' × 14' |
| Wyoming King (84" × 84") | 10' × 10' | 12' × 12' |
| Texas King (80" × 98") | 10' × 12' | 12' × 14' |
| Family Bed (120" × 80") | 14' × 10' | 16' × 12' |
| Family Bed XL (144" × 84") | 16' × 12' | 18' × 14' |
These minimums assume 24–30 inches of clearance on walking sides and enough room to open the bedroom door. If you need space for nightstands or a dresser, go with the recommended size.
How Much Do Oversized Beds Cost?
Oversized beds cost more than standard sizes. Expect $2,000–$7,000+ for a mattress, $1,000–$3,000 for a frame, and $100–$400 for sheets. The total cost for a complete setup typically runs $4,000–$10,000+. Alaskan Kings are the most expensive. Wyoming and Texas Kings cost less.
Compare bed frames by size
- Alaskan King bed frames (108" × 108")
- Wyoming King bed frames (84" × 84")
- Texas King bed frames (80" × 98")
Frequently Asked Questions
What is the biggest mattress size?
The largest size we track is the Imperial King at 144" × 144" (12 feet square, 144 sq ft), built by Delarkin, the only seller we track that makes it. The biggest size you can buy from many sellers is the Alaskan King at 108" × 108" (9 feet square, 81 sq ft), sold by 15 of the 19 sellers we track.
What is the biggest bed size you can buy?
For a square bed with plenty of sellers, the Alaskan King at 108" × 108" (9' × 9'). For width, the Family Bed XL at 144" × 84" (12' × 7') is wider but shorter, and by area slightly larger at 84 sq ft against the Alaskan King's 81. 4 sellers we track make it. The Imperial King (144" × 144") is bigger than both but comes from a single maker. View comparison.
Is there a bed bigger than a King?
Yes, several. The Wyoming King (84" × 84"), Texas King (80" × 98"), and Alaskan King (108" × 108") are all significantly larger than a standard King (76" × 80"). See our Alaskan King vs King comparison for details.
How much does the biggest bed cost?
An Alaskan King mattress runs $2,500–$7,000+ depending on the seller and materials. Add $1,000–$3,000 for a frame and $100–$400 for sheets. Budget $4,000–$10,000+ for a complete setup.
What size room do you need for an Alaskan King bed?
At minimum, 12' × 12'. We recommend 14' × 14' for comfortable clearance with walking space on all sides and room for nightstands. Alaskan King, Wyoming King, Texas King.
Where can you buy oversized beds?
Only specialty makers build them. We track 19 sellers, with 15 selling the Alaskan King, 14 the Wyoming King and 12 the Texas King. See the Alaskan King, Wyoming King and Texas King guides for each seller list.
Is a California King the biggest bed size?
No. A California King (72" × 84") is actually narrower than a standard King and far smaller than any oversized size. The Alaskan King at 108" × 108" has nearly double the surface area of a California King.
What is the largest bed size for a family?
For families co-sleeping with children, the Family Bed (120" × 80", 8 sellers) and Family Bed XL (144" × 84", 4 sellers) are the widest options. For a square layout with equal space on every side, the Alaskan King (108" × 108") is the largest size with many sellers.