Alaskan King Bed Size: Dimensions, Fit & Alternatives
An Alaskan king bed measures 108 inches by 108 inches — a 9-foot square, and the largest bed size sold in the United States. It is 32 inches wider and 28 inches longer than a standard king, which gives a couple, two kids, and a dog room to sprawl without anyone ending up on the edge. It is also a non-standard size, which means fewer mattress options, harder-to-find bedding, and a room requirement most homes can't meet. Here's the full picture before you commit.
Alaskan king bed dimensions at a glance
The Alaskan king belongs to a group of oversized "family bed" sizes that sit above the standard king. None of them are recognized industry-standard sizes the way twin through California king are — they're made by a smaller number of specialty manufacturers.
| Size | Dimensions (inches) | Dimensions (feet) | Square feet |
|---|---|---|---|
| Alaskan king | 108" x 108" | 9' x 9' | 81 |
| Texas king | 80" x 98" | 6'8" x 8'2" | 54.4 |
| Wyoming king | 84" x 84" | 7' x 7' | 49 |
| Standard (Eastern) king | 76" x 80" | 6'4" x 6'8" | 42.2 |
| California king | 72" x 84" | 6' x 7' | 42 |
| Queen | 60" x 80" | 5' x 6'8" | 33.3 |
Put another way: an Alaskan king gives you nearly twice the surface area of a standard king, and about 2.4 times a queen.
Alaskan king vs. Wyoming king vs. Texas king
- Wyoming king (84" x 84") — the smallest step up. It adds 8 inches of width and 4 inches of length over a standard king. The most realistic oversized size for a normal primary bedroom.
- Texas king (80" x 98") — prioritizes length over width. Useful if someone in the bed is well over 6 feet tall and keeps hanging off the end.
- Alaskan king (108" x 108") — the largest. Square, so there's no "head" or "foot" orientation, and it's genuinely a whole-family bed.
What room size do you need for an Alaskan king?
The bed itself is 9 feet by 9 feet. A common rule of thumb for bedroom layout is to leave at least 24 to 30 inches of walking space on any side you need to get around, plus room for doors and drawers to open.
That puts the practical minimum for an Alaskan king at roughly 13 feet by 13 feet if you push one side against a wall and walk the other three. For a room that still has a dresser, nightstands, and a clear path to the closet, 14 x 16 feet or larger is more comfortable. For reference, a typical Los Angeles-area primary bedroom in an older Glendale or Burbank home runs closer to 12 x 14 feet — enough for a standard king, usually not enough for an Alaskan.
Don't forget the path to the bedroom
Oversized mattresses are heavy and often don't fold or bend. Before ordering, measure:
- Doorways and hallway width, including the turn at the top of a staircase
- Stairwell ceiling height — a low overhang is where most big-mattress deliveries fail
- Elevator interior depth if you're in a condo or apartment building
This is worth doing for any king-size purchase, not just an oversized one. Our delivery team runs into tight Glendale staircases regularly, and a five-minute measurement beforehand saves a failed delivery.
The real trade-offs of an Alaskan king
Bedding and accessories are limited
Sheets, mattress protectors, duvets, and bed frames in 108" x 108" are made by a handful of specialty sellers, usually at a premium, and usually not available same-day. Standard king and California king bedding, by contrast, is stocked everywhere — including the king sheet sets and mattress protectors we keep in stock.
Adjustable bases generally don't exist at this size
If you want head and foot articulation, an Alaskan king is the wrong direction. Adjustable bases top out at standard king and California king, and the flexible option is a split king — two twin XL mattresses side by side on two bases, so each person controls their own side.
Moving it is a project
A 9-foot-square mattress is hard to rotate in place, hard to get through a doorway, and not something you move alone. If you expect to relocate within a few years, that matters.
Better-fitting alternatives for most homes
Most people who search for an Alaskan king want the same thing: more room, usually because of co-sleeping kids or pets. There are usually easier ways to get it.
- Standard king (76" x 80") — the widest mainstream size, with the broadest selection of mattresses, bases, and bedding. Details in our king size mattress dimensions guide.
- California king (72" x 84") — 4 inches narrower than a king but 4 inches longer. The better pick for tall sleepers and for long, narrow rooms.
- Split king (two 38" x 80" twin XLs) — same overall footprint as a standard king, but each side can have its own firmness and its own adjustable base position. The practical answer when two people want different things.
If the goal is simply "stop feeling my partner move," motion isolation matters more than width. A pocketed-coil hybrid or a foam mattress will do more for that than 32 extra inches will.
Frequently asked questions
How big is an Alaskan king bed?
108 inches by 108 inches, or 9 feet by 9 feet — 81 square feet of sleeping surface. It's the largest bed size commonly sold in the U.S.
Is an Alaskan king bigger than a California king?
Considerably. A California king is 72" x 84". An Alaskan king is 36 inches wider and 24 inches longer, with roughly double the surface area.
Can you buy regular sheets for an Alaskan king?
No. Standard king sheets are cut for a 76" x 80" mattress and won't reach. You need bedding made specifically for 108" x 108", which is sold by specialty retailers rather than stocked in stores.
What's the biggest bed that fits in a normal bedroom?
For most rooms around 12 x 14 feet, a standard king or California king is the largest size that leaves usable walking space. A Wyoming king (84" x 84") can work in a larger room if you want a step up without going to 9 feet.
Does Jewel City Mattress carry Alaskan king mattresses?
We stock standard sizes through king, California king, and split king. If you're set on an oversized family bed, come talk to us anyway — we can walk you through the trade-offs and show you what a king and a split king actually feel like side by side before you special-order something you can't return easily.
See the sizes in person before you decide
Bed dimensions on a screen don't tell you much. Lying down on a king next to a California king for two minutes tells you a lot. Visit our Glendale showroom and try them back to back — we serve greater Los Angeles, including Burbank, Pasadena, and the surrounding area.
Every mattress we sell comes with a 120-night sleep trial, and we include free delivery and setup across LA, so the size you choose gets into the room and onto the base without you lifting it. We also offer a 90-day price match and 0% APR financing. Stop by and we'll help you measure.