Mattress sizes
Alaskan King Mattress Dimensions
Quick answer
A Alaskan King mattress measures 108 inches wide by 108 inches long, or 9 ft by 9 ft (274 by 274 cm), which is 81 square feet of sleeping surface. Shared by two people that is 36 inches each. This is a specialty size rather than a standard one, so dimensions vary between manufacturers.
The alaskan king is a specialty size, which means the 108 by 108 inch figure below is typical rather than guaranteed. The numbers that actually decide whether it works in your bedroom are the room it needs and the height it ends up at, both of which are below.
What are the exact alaskan king mattress dimensions?
| Measurement | Inches | Centimetres | Feet |
|---|---|---|---|
| Width | 108 | 274 | 9 ft |
| Length | 108 | 274 | 9 ft |
| Sleeping area | 11,664 sq in | 75,076 sq cm | 81 sq ft |
| Width per sleeper | 36 in | 91 cm | 3 ft |
Convention, not a standard
This is widely repeated guidance rather than a measured standard. Treat it as a starting point.
How much room does a alaskan king bed need?
Add about 3 inches of frame on each side, then the walking clearance you want. The convention is 24 inches to squeeze past and 30 or more to be comfortable.
| Clearance on each side | Room width needed | Room length needed |
|---|---|---|
| 24 in | 162 in (13.5 ft) | 138 in (11.5 ft) |
| 30 in | 174 in (14.5 ft) | 144 in (12 ft) |
| 36 in | 186 in (15.5 ft) | 150 in (12.5 ft) |
Convention, not a standard
This is widely repeated guidance rather than a measured standard. Treat it as a starting point.
Assumes a frame about 3 inches wider than the mattress on each side, clearance on both sides and at the foot, and the headboard against a wall. Check yours with Room Size and Clearance Calculator.
How does a alaskan king compare to other mattress sizes?
| Size | Width (in) | Length (in) | Area (sq ft) | Standard size |
|---|---|---|---|---|
| Alaskan King (this page) | 108 | 108 | 81 | No |
| Twin | 38 | 75 | 19.8 | Yes |
| Twin XL | 38 | 80 | 21.1 | Yes |
| Full (Double) | 54 | 75 | 28.1 | Yes |
| Full XL | 54 | 80 | 30 | Yes |
| Queen | 60 | 80 | 33.3 | Yes |
| Olympic Queen | 66 | 80 | 36.7 | No |
Industry standard
These are standard published dimensions, the same across manufacturers.
Which mattresses come in alaskan king?
We do not currently list a mattress that publishes alaskan king as its size, which is normal for a size this uncommon. The mattresses below are the ones we do list, in other sizes. Check the size on the product page before ordering, and expect a alaskan king to need a specialty retailer.
Novilla 8 Inch Twin Mattress
Under $2008 inch twin memory foam.
Check price on Amazon
EGOHOME 8 Inch Twin Mattress
Under $2008 inch twin memory foam, medium firm feel as the maker describes it.
Check price on Amazon
Zinus Memory Foam 8 Inch Green Tea Mattress
Under $2008 inch twin memory foam.
Check price on AmazonSources
- International Sleep Products Association (ISPA) and the Better Sleep Council, standard US mattress sizes
- Published mattress dimensions from major US manufacturers
Frequently asked questions
How many feet is a alaskan king mattress?
A alaskan king mattress is 9 ft wide and 9 ft long (108 by 108 inches).
What are the dimensions and measurements of a alaskan king mattress?
A alaskan king mattress measures 108 inches wide by 108 inches long, or 274 by 274 centimetres. That works out to 81 square feet of sleeping surface. This is a specialty size, so confirm the exact figures with the manufacturer before buying a frame or bedding for it.
What size bed is 108x108, and what's the size of a alaskan king in feet?
A 108x108 bed (108 by 108 inches) is a alaskan king. In feet and inches that is 9 ft by 9 ft, or 274 by 274 centimetres. Specialty sizes vary a little between makers, so confirm with the manufacturer.
How big a room does a alaskan king bed need?
For comfortable movement, allow the mattress plus about 3 inches of frame on each side plus 30 inches of walking clearance. For a alaskan king that means roughly 174 inches of room width and 144 inches of length. You can get away with 24 inches of clearance, but a nightstand will crowd it.
What size sheets fit a alaskan king mattress?
Buy sheets labelled alaskan king. The fitted sheet also has to clear the depth of the mattress, so check the pocket depth separately: standard pockets fit up to 12 inches, deep pockets 13 to 17 inches, and extra deep pockets 18 to 22 inches. A topper adds its full thickness to what the sheet must clear.
Is a alaskan king long enough for a tall person?
A mattress should be about 4 to 6 inches longer than the tallest sleeper. At 108 inches, a alaskan king suits someone up to roughly 104 inches tall, which is 8 feet 8 inches. Above that, look at an even longer specialty size.
Does alaskan king refer to thickness as well?
No. Size describes only the width and length. Thickness is separate and ranges from about 6 inches to over 16, with 9 to 12 inches counting as standard. Thickness changes the total height of the bed and the sheet pocket depth you need, but it never changes the 108 by 108 inch footprint.
How to read the numbers on this page. Standard mattress and bedding dimensions are industry-wide and the same across manufacturers. Guidance like replacement intervals, firmness by body weight and walking clearance is convention rather than a measured standard, and every table here says which it is. Where a manufacturer does not publish a figure we leave it out instead of estimating. This is not medical advice: a mattress is not a treatment for a medical condition, and persistent pain is a reason to see a clinician.
