⚡ Quick Answer: An Alaskan king bed measures 108 inches by 108 inches, or 9 feet by 9 feet — a perfect square covering 81 square feet (11,664 square inches). That makes it the biggest king size bed in production, large enough for two adults and up to four children or pets. You need a 16-by-16-foot bedroom to fit one comfortably.
Most people picture a giant rectangle and stop there. Then their 108-inch comforter arrives, doesn’t fit through the bedroom doorway, and the sheets they ordered come back as a Walmart short-Alaskan-king mismatch at 80 x 108 inches. After spending eight years writing measurement guides for buyers who confuse diagonal screen sizes with widths, I’ll save you from making the same mistake here.
How big is an Alaskan king bed in numbers that matter: 108 inches wide, 108 inches long, 13 to 14 inches thick on most production models. That works out to 274 centimeters per side, 7.52 square meters of surface area, and roughly twice the sleeping space of a standard king (76 x 80 inches). The mattress alone weighs 200 to 300 pounds depending on construction, and most Alaskan kings ship in two or four modular pieces because a single 9-foot slab won’t clear a 36-inch exterior door. According to Sleep Foundation (2025), the Alaskan king is the largest bed size in production worldwide. It exists almost entirely as a custom-order product — you will not find one stocked at IKEA, Costco, or a traditional mattress chain.
The Exact Dimensions of an Alaskan King Bed (And What They Mean)
An Alaskan king bed is 108 inches by 108 inches. That converts to 9 feet by 9 feet, 2.74 meters by 2.74 meters, or 274 centimeters per side. The mattress surface area is 81 square feet — exactly the floor space of a small home office. Picture a square the size of a king-size pool table, then add another two feet on each side.
The 108-inch dimension is industry standard across every manufacturer I checked, from Mattress Insider to Purple to Nolah. Dimensions.com lists the official spec at 108 inches by 108 inches with mattress thicknesses ranging from 10 to 14 inches. Variations exist — the Alaskan King Biggie from one manufacturer stretches to 144 inches wide by 108 inches long — but those are family-bed variants, not the standard Alaskan king.
Conversion cheat sheet
| Measurement | Value | Real-world equivalent |
| Width | 108 in / 9 ft / 274 cm | Two full XL mattresses side by side |
| Length | 108 in / 9 ft / 274 cm | 28 inches longer than a standard mattress |
| Surface area | 81 sq ft / 11,664 sq in | Roughly the footprint of a compact home office |
| Thickness range | 10–14 in / 25–36 cm | Same as most premium hybrid kings |
| Mattress weight | 200–300 lb / 90–136 kg | Requires 3+ people or modular delivery |
If you’ve ever wondered how big 9 inches actually looks against a real object, the Alaskan king is the same principle scaled up — once you anchor the number to a physical reference, the abstract square footage stops feeling abstract.
How Does an Alaskan King Compare to Every Other Mattress Size?
An Alaskan king bed is bigger than every other production mattress on the market. It’s 32 inches wider and 28 inches longer than a standard king (76 x 80 in), 36 inches wider and 24 inches longer than a California king (72 x 84 in), 24 inches wider and 24 inches longer than a Wyoming king (84 x 84 in), and 28 inches wider and 10 inches longer than a Texas king (80 x 98 in). In total surface area, the Alaskan king’s 11,664 square inches roughly doubles the California king’s 6,048 square inches. According to Amerisleep (2026), the three oversized kings — Wyoming, Texas, and Alaskan — are all named after the largest U.S. states, but only the Alaskan king is truly square. That square shape is what makes it usable as a family bed instead of just a longer or wider rectangle.
Side-by-side size comparison
| Bed size | Dimensions (in) | Surface area | Min. room size |
| Alaskan King | 108 x 108 | 81 sq ft | 16 x 16 ft |
| Alberta King | 96 x 96 | 64 sq ft | 14 x 14 ft |
| Texas King | 80 x 98 | 54.4 sq ft | 13 x 14 ft |
| Wyoming King | 84 x 84 | 49 sq ft | 13 x 13 ft |
| California King | 72 x 84 | 42 sq ft | 12 x 14 ft |
| Standard King | 76 x 80 | 42.2 sq ft | 12 x 12 ft |
| Queen | 60 x 80 | 33.3 sq ft | 10 x 10 ft |
The pattern in the table is what most guides miss: shape matters as much as size. A Texas king gives you length for tall sleepers. A Wyoming king gives you width for a third co-sleeper. The Alaskan king is the only oversized mattress that gives you both, plus enough length for sleepers over 6 feet tall to lie sideways and still keep their feet on the bed.
Will an Alaskan King Bed Fit Your Room?
You need a bedroom of at least 16 feet by 16 feet — 256 square feet — to fit an Alaskan king comfortably. That’s the recommendation from Mattress Insider and matches the standard cited by every major manufacturer. The math: the bed alone occupies 81 square feet, and you need 24 to 36 inches of walking clearance on three sides plus space for nightstands.
Here’s where it gets uncomfortable for most buyers.
The average primary bedroom in U.S. homes built since 2010 measures around 15 feet by 15 feet. Drop an Alaskan king into that space and you have less than 3 feet on either side after accounting for the frame. Nightstands stop fitting. You can’t walk past the bed without turning sideways. The room starts looking like a bed with a strip of leftover floor.
Three checks before you buy
- Measure the room, not just the wall the bed will sit against. Pull a tape from each corner. A 16-by-16-foot room is non-negotiable for comfort; 14-by-14 is the absolute floor.
- Measure the path from your front door to the bedroom. Door widths, staircase turns, and hallway clearances all matter. Standard exterior doors are 36 inches — an unrolled 108-inch mattress won’t make that turn.
- Confirm modular delivery. Most Alaskan king mattresses ship in two or four pieces specifically because a single 9-foot slab can’t navigate a typical home. Check this before you order.
Visualizing 16 feet on each side is easier if you anchor it to smaller units. A 12-inch ruler gives you one foot; sixteen of those laid end-to-end gives you the wall length. For a more granular sense of how big 16 inches reads versus 16 feet, the answer is a factor of twelve — the same difference between picking up a laptop and walking the length of a mid-size sedan.
What Does an Alaskan King Bed Actually Cost in 2026?
An Alaskan king mattress costs between $2,000 and $7,000 in 2026, with premium handcrafted models running $5,000 to $10,000. That’s the mattress alone. The total cost of ownership lands closer to $4,500 to $12,000 once you add the frame, foundation, sheets, comforter, and delivery.
Real 2026 cost breakdown
| Component | Budget range | Premium range |
| Mattress (foam/hybrid) | $2,000–$3,500 | $5,000–$10,000 |
| Bed frame | $800–$1,500 | $2,000–$5,000 |
| Foundation/box spring | $400–$700 | $900–$1,800 |
| Sheet set | $150–$300 | $400–$800 |
| Comforter/duvet | $200–$400 | $500–$1,200 |
| Mattress protector | $80–$150 | $200–$350 |
| Delivery & setup | $200–$500 | $500–$1,200 |
Hidden costs run higher than buyers expect. Dry-cleaning a 120-by-136-inch Alaskan king comforter costs roughly three times what a standard king comforter runs at the same cleaner. Sheets wear out faster because the fitted-sheet corners stretch around a deeper, wider profile. Replacing the mattress in 8 to 10 years means another major purchase — Alaskan kings rarely qualify for retail trade-in programs.
According to DreamCloud Sleep, buyers should budget for the full bed system, not just the mattress sticker price. The hidden multiplier — what I’d call the true cost ratio for oversized beds — sits at roughly 1.8x to 2.2x the mattress price once you finish outfitting the bed.
Can You Even Find Sheets for an Alaskan King Bed?
Yes, but you can’t buy them at Target, Walmart, IKEA, or HomeGoods. Alaskan king bedding is custom-order specialty product, mostly from the same manufacturers that build the mattresses. Your fitted sheet needs to match the mattress at 108 by 108 inches, with a pocket depth of at least 13 inches to clear the mattress thickness.
Exact bedding dimensions
- Fitted sheet: 108 x 108 inches, 13–18 inch pocket depth
- Flat sheet: 120 x 124 inches up to 125 x 125 inches for generous overhang
- Comforter or duvet: roughly 120 x 136 inches, sometimes 124 x 136 inches
- Pillowcases: standard or king pillowcases — no oversized version exists, you simply use more of them
Be careful searching Amazon and Walmart. Listings for “Short Alaskan King” sheet sets at 80 by 108 inches are common and will arrive 28 inches too narrow. The fitted sheet won’t reach the mattress edges. Verify both dimensions before clicking buy — 108 by 108 is the only spec that fits a true Alaskan king.
Who Actually Needs an Alaskan King Bed? (The Honest Answer)
Most people who think they want an Alaskan king actually want a Wyoming king. Most people who buy a Wyoming king and regret it should have bought an Alaskan king. The deciding factor is co-sleepers, not personal space preference.
Decision matrix: who fits each oversized king
| Your situation | Best fit | Why | Avoid |
| Two adults, occasional pet | Standard or Cal king | Alaskan king is overkill and wastes floor space | Alaskan king |
| Couple + one young child | Wyoming King | Square shape, fits a 13×13 room, half the cost | Texas king (too narrow) |
| Tall sleeper, 6’4″+ | Texas king | 98-inch length is the win; width matters less | Wyoming king (too short) |
| Two adults + 2+ kids regularly | Alaskan King | Only mattress with enough surface for 4–6 sleepers | Anything smaller |
| Couple + multiple large pets | Alaskan King | Extra length keeps feet-room when dogs sprawl | Cal king (too narrow) |
| Luxury statement piece | Alaskan King | Largest production mattress; visual impact | Smaller oversized options |
Here’s the contrarian piece most mattress retailers won’t tell you: an Alaskan king is the wrong bed for couples without kids or co-sleeping arrangements. The 32-inch jump in width over a standard king mostly serves a third or fourth body. If you’re two adults who like personal space, a split king — two Twin XL mattresses side by side — gives you 76 by 80 inches of total surface plus independent firmness adjustability. That solves the personal-space problem for a fraction of the cost.
Delivery, Setup, and What Goes Wrong
Standard exterior doorways are 36 inches wide. Interior bedroom doors run 28 to 32 inches. An unrolled Alaskan king mattress is 108 inches across. The geometry doesn’t work, which is why most Alaskan king mattresses ship in two or four modular sections that get assembled inside the room.
According to Mattress Miracle’s 2026 oversized bed guide, second-floor master bedrooms occasionally require window delivery — a crane or a careful maneuver through an opened window — because the staircase turn won’t accommodate even modular sections. Before ordering, measure your hallway width, staircase landing, bedroom door width, and the full path from the entry to the room.
What to do before delivery day
- Confirm whether the mattress ships modular (2 or 4 pieces) or single-piece. Single-piece is rare and almost always requires window delivery.
- Remove the bedroom door from its hinges. Most deliveries require this even with modular shipping.
- Schedule three adults minimum for setup. The mattress can weigh 200–300 pounds; the frame adds another 150–250.
- Plan 1–2 hours for assembly. Foundation pieces lock together, then the mattress sections align with their own seam or zipper system.
Frequently Asked Questions
Is an Alaskan king bed the same size as a California king?
No — an Alaskan king is significantly larger. The Alaskan king measures 108 by 108 inches (81 sq ft). The California king measures 72 by 84 inches (42 sq ft). An Alaskan king is nearly twice the surface area of a California king.
How many people can sleep on an Alaskan king bed?
An Alaskan king comfortably sleeps two adults plus up to four children or pets. Some manufacturers describe it as fitting two adults and four kids with everyone having genuine personal space, not just squeezed in.
Will an Alaskan king bed fit through a standard door?
Not as a single piece. Most Alaskan king mattresses ship in two or four modular sections specifically because a 108-inch slab won’t clear a 36-inch exterior door or navigate typical staircase turns. Always confirm modular shipping before ordering.
How much should I budget for a complete Alaskan king bed setup?
Plan for $4,500 to $12,000 total in 2026 — that includes mattress, frame, foundation, sheets, comforter, mattress protector, and delivery. Mattress alone runs $2,000 to $10,000 depending on materials and construction quality.
What’s the largest bed size in the world?
The Alaskan king at 108 by 108 inches is the largest bed size in regular production. The largest bed ever built was a custom 87-by-54-foot bed constructed for a 2011 festival in Hertme, Netherlands, but that was a one-time installation, not a production model.
The Bottom Line on Alaskan King Bed Size
An Alaskan king bed is 108 by 108 inches — 9 feet square, 81 square feet of sleeping surface, and the largest production mattress you can buy in 2026. It costs $2,000 to $10,000 for the mattress alone, needs a 16-by-16-foot bedroom to feel comfortable, ships modular because it won’t fit through your front door otherwise, and requires custom-order sheets because no retail store stocks them.
Three next steps if you’re seriously considering one. Measure your bedroom corner to corner today, not next week. Walk the path from your front door to that room with a tape measure and note every doorway, hallway turn, and staircase landing under 40 inches. Call two or three Alaskan king specialty retailers and ask about modular shipping options to your specific address before you spend a dollar.
If your room measures under 14 by 14 feet, an Alaskan king won’t work no matter how much you want it. Consider a Wyoming king — same square shape, smaller footprint, roughly half the total cost.
