What Is the Biggest Bed Size?
The biggest standard bed size you can buy is the Alaskan King at 108" × 108" (9 feet by 9 feet), giving you 81 square feet of sleeping surface. For even wider options, the Family Bed XL stretches to 144" (12 feet) wide. Below is every oversized bed size compared.
What Is the Biggest Mattress Size You Can Buy?
The biggest mattress size available is the Alaskan King at 108" × 108" (9 feet × 9 feet). It's the largest standardized oversized mattress sold by multiple manufacturers. Beyond that, custom sizes like the Family Bed (120" × 80") and Family Bed XL (144" × 84") exist but are made by a single manufacturer and aren't widely available.
For most buyers, the Alaskan King is the practical largest mattress size. It's available from multiple verified sellers, ships nationwide, and you can find bedding and frames to match. The Wyoming King (84" × 84") and Texas King (80" × 98") are also widely available if you need something smaller.
Largest Mattress Sizes Ranked
Here are the largest mattress sizes ranked by practical availability - sizes with multiple sellers ranked first:
| Rank | Name | Dimensions | Square Feet |
|---|---|---|---|
| 1 | Alaskan King | 108" × 108" | 81 sq ft |
| 2 | Wyoming King | 84" × 84" | 49 sq ft |
| 3 | Texas King | 80" × 98" | 54.4 sq ft |
| 4 | Family Bed XL | 144" × 84" | 84 sq ft |
| 5 | Family Bed | 120" × 80" | 66.7 sq ft |
| 6 | Standard King | 76" × 80" | 42.2 sq ft |
| 7 | California King | 72" × 84" | 42 sq ft |
Note: Family Bed sizes have larger square footage but are made by a single manufacturer. Alaskan King is the largest size available from multiple sellers. Ready to buy? See all verified oversized bed retailers.
All Oversized Bed Sizes Compared
Last verified: February 2026
| Size | Dimensions (in) | Sq Ft | |||
|---|---|---|---|---|---|
| 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 – 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.
Family Bed (120" × 80") & Family Bed XL (144" × 84")
These are the widest beds available, designed explicitly for families who want everyone in one bed. The standard Family Bed is 10 feet wide; the XL stretches to 12 feet. Made by Taylor & Wells (sold through Bedding Mart), these are wide rectangles rather than squares.
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 – 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.
See our full Alaskan King bed price breakdown →Frequently Asked Questions
What is the biggest mattress size?
The biggest mattress size available from multiple manufacturers is the Alaskan King at 108" × 108" (9 feet × 9 feet). While custom sizes like the Family Bed XL (144" × 84") exist, they are only made by a single manufacturer. The Alaskan King is the largest standardized mattress size you can reliably buy.
What is the biggest bed size you can buy?
The Alaskan King at 108" × 108" (9' × 9') is the largest standard square bed. The Family Bed XL at 144" × 84" (12' × 7') is wider but shorter. By total area, the Family Bed XL is slightly larger at 84 sq ft vs the Alaskan King's 81 sq ft. 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 a handful of specialty manufacturers make them. We track 12 verified sellers – see our Alaskan King bed guide, Wyoming King bed guide, and Texas King bed guide for full seller directories.