Alaskan King Mattress: Size, Real Cost, Who Sells It & Alternatives

An Alaskan king mattress measures 108 × 108 inches — nine feet by nine feet — and it is the largest mattress size you can order from a mainstream online seller. That is 11,664 square inches of sleeping surface, almost double a standard king. It exists for one main job: letting two adults, a couple of kids and maybe a dog all sleep in a single bed without anyone being shoved off the edge.

It is also expensive, hard to find and hard to furnish. Nectar and Amerisleep both put Alaskan king mattress prices at roughly $2,500 to $5,000, and the two real products we could verify sell for $3,250 (Nolah Luxe Alaskan King, on sale) and $4,699 (Mattress Insider’s Alaskan King Bed). None of the brands we normally cover — Saatva, Nectar, DreamCloud, Puffy, Bear or Siena — sells one. Their size selectors stop at king, California king and split king.

Our opinion, stated plainly: most families who think they want an Alaskan king are better off pushing two standard mattresses together. Two California kings side by side give you a 144 × 84 inch bed for $798 to $1,798 in mattresses, versus $3,250 or more for a single Alaskan — and you can replace, move or split them later. The true Alaskan king only wins if you want one seamless surface, have a room of at least 13 feet square (16 is better), and accept that sheets, frame and delivery all become specialist purchases.

Every source we checked gives the same number: 108 inches wide and 108 inches long, which is 274 × 274 centimetres. Nectar, Amerisleep, Nolah and Mattress Insider all list exactly that, and Nolah’s product page adds the surface area of 11,664 square inches. Unlike the Texas king, where published dimensions wobble between retailers, the Alaskan king has settled into a single industry measurement. If a listing says “Alaskan king” and gives any other number, treat it as a custom size and confirm before you pay.

Height is not standardised, because it depends on the build. Nolah’s Luxe Alaskan King is 13 inches tall; Rove Lab’s buying guide suggests looking for something at least 12 inches thick. That matters for sheets: a 13-inch mattress with a cover needs a fitted sheet with a deep pocket, and at this size you can’t just grab a deep-pocket king set off the shelf.

To put the numbers in human terms: 108 inches is wider than a queen (60 inches) and a twin XL (38 inches) combined, with 10 inches to spare. It is 32 inches wider than a king and 28 inches longer. A six-foot-tall adult lying across the bed sideways would still have three feet of mattress to spare. Our mattress sizes guide has every standard size in inches and centimetres if you want the full chart; this page is only about the oversized end.

There are four “bigger than king” options people search for, and they solve different problems. Two of them are standard sizes that every brand sells; three of them are oversized specialty sizes. Here is how they stack up, with dimensions from Nectar and Amerisleep for the oversized beds and the Sleep Foundation for the standard ones.

• California king — 72 × 84 inches. A standard size, four inches longer and four inches narrower than a king. It is the right choice for tall sleepers who don’t need extra width, and you can buy it from almost any brand. See our best California king mattress picks.
• Wyoming king — 84 × 84 inches. A seven-foot square: eight inches wider and four inches longer than a king. Nectar describes it as fitting two adults and a child, and says its accessories are easy to find. It is the most sensible oversized size for couples with a large dog.
• Texas king — 80 × 98 inches. A long, comparatively narrow bed — over eight feet long but only four inches wider than a king. It is aimed at very tall sleepers. Note that some pages print it as 98 × 80, which is the same bed listed length-first; Amerisleep’s own article does both.
• Alaskan king — 108 × 108 inches. The biggest by a wide margin, with 49% more area than a Texas king and 65% more than a Wyoming king. It is the only one of the four built for whole-family co-sleeping.

The practical decision is simpler than the table suggests. If your problem is length — you are 6′5″ and your feet hang off — a California king fixes it for much less money, and a Texas king is the specialist upgrade. If your problem is width — kids and pets keep migrating into your bed — a Wyoming king adds a little, and an Alaskan king adds a lot. Nobody needs an Alaskan king for height alone; you would be paying for 36 inches of width you didn’t ask for.

Price follows size, roughly. Nectar’s ranges are $1,500–$4,500 for a Wyoming king, $2,000–$3,500 for a Texas king and $2,500–$5,000 for an Alaskan king, and it calls the Alaskan king the “most expensive oversized mattress.” Amerisleep publishes nearly identical ranges and adds that oversized sizes typically run 30–60% above a standard king. Treat those as broad guides rather than quotes: the two Alaskan kings we priced landed in the middle and top of that range.

This is where most Alaskan king plans fall apart. A nine-foot square bed is not just big, it is big in both directions, so it eats the floor of a bedroom in a way a long rectangular bed doesn’t. Recommendations vary by source. Nectar and Amerisleep both suggest a room of about 16 × 16 feet. Rove Lab’s buying guide sets a lower floor of 13 × 13 feet “to accommodate the bed comfortably.” The difference is the difference between a bed that sits in a room and a bed that is the room.

Do the subtraction and you see why. In a 13-foot room, a centred Alaskan king leaves two feet on each side. That is enough to walk past sideways, but not enough for a nightstand, a dresser you can open, or a door that swings inward. In a 16-foot room you get three and a half feet on each side, which is where a big bed starts to look deliberate rather than crammed in. Push the headboard against a wall, as nearly everyone does, and the numbers shift: you gain floor at the foot and lose the walkway behind.

For comparison, Nectar lists 12 × 12 feet for a Wyoming king and 12 × 14 feet for a Texas king, and the Sleep Foundation and Zoma put a standard king comfortably in a 12 × 12 room. Many primary bedrooms in newer US homes are in that range. Very few are 16 feet square. Before you order anything, mark a 108-inch square on your floor with painter’s tape, then try opening every door, closet and drawer in the room. If that feels tight on bare floor, it will feel worse with a 12-inch-high platform and a headboard on top.

Measure the route in, not just the room. Rove Lab specifically warns about narrow hallways, tight corners and low ceilings. A compressed mattress in boxes is easy, but a frame can arrive as a single long pallet — Nolah’s frame ships in a package about 116 inches long. If your stairs have a landing turn, check that a nine-and-a-half-foot box can make it before you buy.

Short list. Regular furniture stores don’t stock the size, and Rove Lab notes “you won’t find it at your local furniture store.” Nectar’s own oversized guide admits oversized mattresses “are not readily available in the offline or online market” and points readers toward custom bed makers. In practice you are buying from a handful of online specialists or a local mattress factory that will build to order.

We could verify current product pages and prices for two sellers. Neither is an affiliate partner of ours, so we earn nothing if you buy from them, and the links below are plain links.

Those two illustrate the market’s split. Nolah’s is a bed-in-a-box built at a giant size: compressed, shipped by parcel carrier, with a trial and a refund process. Mattress Insider’s is closer to a custom order: built after you pay, with no trial, and its terms say plainly that “the sleep trial does not apply to any of our oversized/giant mattresses.” If you value the safety net, that difference matters more than the $1,449 price gap. If you buy from Nolah, get the trial length confirmed in writing, because its own product page contradicts itself.

Other names come up in search — specialist “Alaskan King Bed” stores, Rest Right, and local mattress makers who will build any size — but we could not verify current prices or terms for them, so we are not listing numbers. What we can say is that the brands whose lab and owner data we track (see our best mattress rankings) do not make the size. If you want a Saatva or DreamCloud feel at a giant size, the honest route is two of their standard mattresses side by side, which we cover below.

The mattress itself runs from about $2,500 to $5,000 according to Nectar and Amerisleep, and our two verified products sit at $3,250 and $4,699. But the mattress is not the expensive part of the project — the stuff around it is, because nothing about an Alaskan king is off the shelf.

Take Nolah, the cheaper of the two sellers, and build a complete setup from its own catalogue. The Luxe mattress is $3,250. Its 109 × 109 inch solid cherry frame with headboard is $3,597 on sale, and it ships for $375 via FedEx Freight. Add Amerisleep’s estimate that a full set of custom bedding “can exceed $1,000,” and you are past $8,200 before tax. You could choose a cheaper frame from a local carpenter and cheaper sheets, but you would struggle to get the total much below $5,000.

Compare that with the king market. Our best king size mattress guide found good kings from $399 (Siena) to $899 (DreamCloud Classic Hybrid) to $1,369 (DreamCloud Premier Hybrid) at October 2026 checkout prices, and king sheets and frames cost a fraction of their oversized equivalents because they are mass-produced. In other words, an Alaskan king setup costs about what two or three complete king bedrooms would.

Watch for anchor pricing here just as you would at standard sizes. Nolah shows a $5,000 list price next to its $3,250 sale; Mattress Insider shows $6,999 next to $4,699. Those percentages-off are marketing, not a sign that today is a special moment. Our best time to buy a mattress guide explains how these permanent sales work and when big-ticket mattresses actually dip.

A one-piece 108-inch mattress would be close to impossible to get into most houses, so both sellers we verified split it. Nolah ships the Luxe in three compressed parcels by FedEx: two boxes each hold two quarter-sections of the core (92 lb each), and the third holds the foam topper and the outer shell (95 lb). Every box is 15 × 15 × 59 inches, which fits through a normal door. Nolah says most people assemble it in about 15 minutes — zip the core quarters into the shell, lay the topper over the seams, close the cover.

That modular build is the key engineering trick, and it has a trade-off you should know about. A sectional core means seams. A good topper and cover hide them, but you are not sleeping on a single continuous spring unit the way you would on a one-piece king. For most families that is a non-issue; for a couple who sleep exactly where two sections meet, it is worth asking the seller how the topper bridges the joints.

Mattress Insider also ships its three-piece bed free by FedEx Ground in the contiguous US, after one to two weeks of production, with transit of two to three business days to the East Coast and four to five to the West. Its own page warns that “giant mattress delivery times can be up to 30 days or more,” and shipments to Alaska, Hawaii, US territories or Canada require a phone quote. Yes — the Alaskan king is surprisingly hard to get delivered to Alaska.

The frame is usually the harder delivery. Nolah’s ships on a pallet by freight, roughly 116 inches long and 190 to 211 pounds depending on whether you add the headboard, and takes 10 to 14 business days to dispatch. Freight usually means curbside delivery, so plan for at least two strong people to carry it in and assemble it. Rove Lab’s guide says you may also face extra delivery charges and need professional help with setup.

A standard frame will not work, and the floor is a bad long-term answer. Amerisleep points out that frames and foundations are custom at this size and that putting the mattress directly on the floor can shorten its life. Nectar’s advice is blunter: order a custom frame from a local craftsperson or buy one online. Any frame you choose needs proper centre support across nine feet — Nolah’s uses two centre beams on Y-shaped legs plus solid hardwood slats 3 inches apart.

Sheets are the recurring cost people forget. Amerisleep says plainly that standard sheets, comforters and duvet covers won’t fit any oversized size, and Nectar notes that most bedding on the market is incompatible with large beds. Your choices are the mattress seller’s own sets (Mattress Insider sells Alaskan king sheets; it quotes mattress protectors by phone), a specialist oversized bedding company, or a custom textile service. Buy at least two sets at once — you will not be able to run to a store when one tears.

For the top layer, both Nectar and Amerisleep use the same rule of thumb: a comforter should be about 16 inches wider and 12 inches longer than the mattress. On a 108-inch square that means roughly 124 × 120 inches, so a “California king” comforter, even an oversized one, will look like a postage stamp. Many families end up using two king duvets side by side instead, which also solves the problem of one person stealing all the covers.

A mattress protector is non-negotiable on a bed this expensive, especially one shared with young children and pets. Neither seller lists one at a fixed price; budget for a custom order and ask before you buy the mattress, not after the first accident.

Here is the part most Alaskan king articles skip. You can get the same or more sleeping area from standard mattresses, with standard sheets, standard frames and standard trials, for a fraction of the price. The trade-off is a seam down the middle, which a bed bridge (a foam strip that fills the gap) and a large topper or two separate duvets mostly solve.

Two California kings side by side — 144 × 84 inches. This is the build we would choose for most co-sleeping families. It is 36 inches wider than an Alaskan king and 24 inches shorter, with more total area (12,096 square inches versus 11,664). Using Siena at $399 each, that’s $798 in mattresses; using the DreamCloud Classic Hybrid at $899 each, it’s $1,798. Either is roughly half of Nolah’s Alaskan king or less, and both come with standard Cal king sheets, frames and trials. Nectar’s own guide lists a 144 × 84 inch “family bed” as a named size — this is it.

Two kings side by side — 152 × 80 inches. Widest of all, and the same price as two Cal kings at both Siena and DreamCloud, because those brands charge the same for king and Cal king. The 80-inch length suits families with no very tall adults. It is the easiest version to source sheets for, since king bedding is everywhere.

King plus a twin XL — 114 × 80 inches. Almost exactly the width of an Alaskan king, at a much lower price. The twin XL is the same 80-inch length as a king, so the ends line up. Siena and DreamCloud sell twin XLs as the halves of their split kings — $498 and $1,198 for the pair — so one half costs roughly $249 or $599, putting the build at about $648 or $1,498. This is the best choice when a child co-sleeps for a few years and will eventually move the twin XL into their own room.

The modular approach has three advantages beyond price. You can choose different firmness on each side — a firmer mattress for a heavier parent and a softer one for a side-sleeping partner, as our best mattress for couples guide discusses. You can move it through any doorway. And when the kids move out, you are left with two normal beds instead of a nine-foot square nobody wants. Our best mattress for kids guide covers what to put in that child’s room afterwards.

The honest drawbacks: you get a seam, two mattresses can be different heights if you mix brands, and two frames side by side need to be the same height too. Buy both mattresses from the same model to keep heights matched, use a bed bridge, and lock the frames together. If a seam is a dealbreaker — for example, because a baby will sleep in the middle — that is the strongest argument for a true one-piece-surface Alaskan king. Note too that the safest sleep arrangement for infants is a matter for your pediatrician, not a mattress guide.

We are opinionated about this because the stakes are high: an Alaskan king setup is a $5,000-to-$8,000 decision that is hard to undo.

• Buy one if you have a bedroom of at least 13 × 13 feet (ideally 16 × 16), regularly sleep three or more people plus pets in one bed, want one continuous surface with no gap in the middle, and are happy paying specialist prices for sheets and a frame.
• Consider a Wyoming king instead if it is two adults and a big dog. An 84-inch square gives eight extra inches of width over a king in a 12 × 12 room, and Nectar says accessories are easy to find.
• Get a California king instead if your real problem is height. It is a standard size with every brand and every sheet maker — our California king picks start here — and a Texas king is the specialist step up.
• Build from standard sizes if you are co-sleeping for a few years, care about cost, rent your home, or might move. Two Cal kings or a king plus a twin XL wins on almost every practical measure.
• Skip it entirely if your room is under 13 feet square, your stairs have a tight turn, or you need a long sleep trial — Mattress Insider offers none on oversized beds.

If you do go ahead, buy the frame and bedding plan first and the mattress second. A mattress you can’t put on anything is the most expensive floor rug you’ll ever own. And if you are still choosing between sizes, our how to choose a mattress guide and the 30-second mattress finder will help you pick the feel before you pick the footprint.