Alaskan King Mattress Size: Complete Dimensions Guide
What Is a Alaskan King Mattress?
The Alaskan King mattress is the largest standard mattress size available, measuring an expansive 108 inches wide by 108 inches long—creating a perfect 9-foot square sleeping surface. This monumental bed provides 11,664 square inches of space, making it ideal for large families who co-sleep with multiple children or pets, as well as luxury bedroom buyers seeking the ultimate statement piece. At 274.3 cm × 274.3 cm, the Alaskan King is strictly a custom-order product with no standard bedding compatibility whatsoever. Every component—from the mattress itself to sheets, duvets, bed frames, and foundations—must be custom-made to accommodate these extraordinary 108" × 108" dimensions. This is not a mainstream purchase but rather a specialty item for those with spacious master suites, unique sleeping arrangements, or the desire for uncompromising bedroom luxury. The investment extends beyond the mattress to include custom bedding, specialized delivery, and room modifications to ensure proper fit and functionality.
Size at a Glance
36 inches wider and 28 inches longer than a standard King, offering nearly double the sleeping surface area.
16 × 16 feet minimum (18 × 18 feet recommended)
Who It Fits
- Families with 3-4+ children who practice co-sleeping arrangements
- Couples who share their bed with multiple large breed dogs or pets
- Luxury homeowners with oversized master suites seeking statement furniture
- Individuals who desire maximum personal space and sleeping comfort
- Custom-built platform bed frames or reinforced box spring foundations
- Spacious bedrooms in estates, mansions, or custom-built homes
- Sleepers who are exceptionally tall or prefer sprawling sleep positions
How It Compares
| Type | Width | Length | Notes |
|---|---|---|---|
| Standard King | 76″ | 80″ | The Alaskan King is 32 inches wider and 28 inches longer—nearly double the surface area |
| California King | 72″ | 84″ | The Alaskan King is 36 inches wider and 24 inches longer, offering substantially more width |
| Wyoming King | 84″ | 84″ | The Alaskan King is 24 inches wider, making it the largest square mattress available |
| Texas King | 80″ | 98″ | The Alaskan King is 28 inches wider but 10 inches shorter, prioritizing width over length |
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Pro Tips
- 1 Measure your bedroom carefully including door widths, hallways, and stairwells before ordering—professional delivery often requires window or wall modifications for the 9×9 foot mattress.
- 2 Budget an additional $2,000-$4,000 beyond the mattress cost for custom bed frames, foundations, bedding sets, and specialized delivery services that are absolutely required.
- 3 Order at least two complete sheet sets when purchasing your mattress, as custom bedding takes weeks to produce and you'll need backups while laundering.
- 4 Consider a split Alaskan King design with two separate mattresses side-by-side if you and your partner prefer different firmness levels or to simplify delivery logistics.
Frequently Asked Questions
Where can I buy an Alaskan King mattress?
Alaskan King mattresses are available exclusively through custom mattress manufacturers and specialty bedding companies—you won't find them in standard furniture stores. Companies like Ace mattress manufacturers, specialty online retailers, and local custom bedding shops can fabricate these massive 108" × 108" mattresses to order. Expect lead times of 4-12 weeks for production, and factor in specialized delivery services since the mattress cannot fit through standard doorways and often requires professional installation. Always verify the manufacturer's ability to provide matching custom bedding and foundation support before ordering.
How much do sheets and bedding cost for an Alaskan King?
Custom bedding for an Alaskan King mattress typically costs $300-$800 for a quality sheet set, $400-$1,200 for a duvet or comforter, and $200-$500 for fitted sheets alone. Because absolutely no standard bedding fits the 108" × 108" dimensions, every textile must be custom-made by specialty bedding manufacturers. Budget-conscious buyers should expect to spend at least $1,000-$2,000 for a basic bedding package including sheets, duvet, and pillowcases. Luxury options with high thread counts, premium materials like Egyptian cotton or silk, can easily exceed $3,000-$5,000 for a complete bedding set. These costs recur whenever you need to replace worn bedding.
What size bedroom do I need for an Alaskan King mattress?
An Alaskan King requires a minimum bedroom size of 16 feet × 16 feet, though 18 feet × 18 feet or larger is strongly recommended for comfortable movement and furniture placement. The 9-foot square mattress itself consumes 81 square feet of floor space, and you'll need at least 2-3 feet of clearance on each side for walking space, making the bed, and accessing nightstands. Rooms smaller than 16×16 feet will feel cramped and claustrophobic, with insufficient space for dressers, seating areas, or comfortable navigation. Consider ceiling height as well—high ceilings help balance the visual weight of such an enormous bed in the room.
Can an Alaskan King mattress fit through standard doors?
No, an Alaskan King mattress cannot fit through standard doorways, which are typically 32-36 inches wide, while the mattress measures 108 inches on each side. Professional delivery teams must either hoist the mattress through large windows, deliver it in sections if it's a split construction, or in some cases, temporarily remove door frames or windows for installation. Some manufacturers specifically design Alaskan King mattresses as two-piece or hinged constructions to address this logistical challenge. Always discuss delivery logistics with your mattress manufacturer before purchase, as installation may require additional costs ranging from $200-$800 depending on your home's accessibility and any necessary modifications.
Not Strictly Necessary, But...
It was the year of the mattress, is how I think of it now. My cousin Elena had moved in after her divorce, bringing her three kids and two Great Pyrenees into our already crowded house. We needed a solution that didn't feel like survival. I measured our bedroom like I was mapping a labyrinth. Every configuration seemed wrong—bunk beds, dividers, separate rooms that didn't exist. Elena kept apologizing, her youngest clinging to her leg. "We'll make it work," I said, though I didn't know how. Then I found it: the Alaskan King. Nine feet by nine feet. When I told Elena the dimensions—108 inches on each side—she laughed. "That's not a bed, that's a continent." The day it arrived, seven of us christened it like explorers planting a flag. Her kids sprawled across one territory, the dogs claimed another, and Elena and I found ourselves on opposite shores with our partners, everyone finally breathing. But the real moment came three months in, on a Tuesday morning. I woke to find we'd all migrated to the center in the night—kids, dogs, adults—a tangle of limbs and warmth in the middle of all that space. We'd created our own gravity. Elena caught my eye across the sleeping pile and smiled. The paradigm had shifted. We didn't need separate spaces. We needed a big enough center that choosing closeness felt like freedom, not necessity.