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Wyoming King vs California King: The 84-by-84 Square Format Compared
Wyoming King is 7 feet by 7 feet. Cal King is 6 feet by 7 feet. Same length, 12 more inches of width. This page covers when the upgrade from Cal King to Wyoming makes sense, and when it does not.
Last verified April 2026
Wyoming King is one of the oversized custom king formats, sized at 84 by 84 inches (a 7-foot square). It is not an ISPA-standard size. It exists in a small specialty market alongside Alaskan King (108 by 108), Texas King (80 by 98), and Alberta King (96 by 96)[1].
For Cal King buyers wondering whether to go bigger, Wyoming King is the most natural next step: the length stays at 84 inches (so footboard and clearance math is unchanged), but the width jumps from 72 inches to 84. The extra 12 inches of width is the upgrade you are buying.
The size comparison
| Size | Dimensions (in) | Square feet | Square inches | Floor footprint |
|---|---|---|---|---|
| California King | 72 x 84 | 42.0 | 6,048 | 6 x 7 ft |
| Wyoming King | 84 x 84 | 49.0 | 7,056 | 7 x 7 ft |
| Difference | +12 in width | +7 sq ft | +1,008 sq in | +1 ft width |
Cal King dimensions from the ISPA size schedule[2]. Wyoming King is a non-ISPA custom size produced by specialty manufacturers.
When Wyoming King is the right call
Wyoming King makes sense for households with binding width constraints that Cal King cannot satisfy:
- Four-person co-sleep is the daily pattern: two adults plus two children regularly share the bed. Cal King provides 72 inches of width; four typical sleepers need 80 to 100 inches. Wyoming King's 84 inches is the practical fit.
- Two large adults plus a large dog: two adults at 22 inches plus a 70-pound dog at 32 inches occupies 76 inches. Cal King runs out of room; Wyoming gives 8 inches of buffer.
- Tall sleeper plus partner who values width: the tall sleeper still gets 84 inches of length, and the partner gets the extra width without compromising the height fit.
- Master bedroom is genuinely large: a 14 by 16 foot or larger master bedroom comfortably absorbs the 7-by-7 footprint with nightstands and walkways. Smaller bedrooms cannot.
When Cal King is still the right call
Stay with Cal King if:
- Bedroom is under 13 by 13 feet (Wyoming will not fit comfortably)
- Budget for mattress is under $3,000 (Wyoming starts at $2,500 to $4,500 and rises sharply)
- You expect to move within 3 to 5 years (Wyoming King is harder to sell or relocate; custom sheets and frames travel with the mattress)
- Only two people share the bed daily (Cal King width is sufficient for two)
- The household is averse to specialty-product purchasing (slower delivery, harder-to-source accessories, custom-only frame options)
The accessory ecosystem reality
Wyoming King sheets, comforters, mattress protectors, and bed frames are made by a small number of specialty suppliers. Costs are typically 3 to 5 times the equivalent Standard King accessory. Stocking is special-order in nearly all cases. Replacement cycles for damaged or worn linens become a meaningful logistical issue, not a quick trip to Bed Bath & Beyond.
Plan the entire ecosystem before committing. A Wyoming King mattress without a Wyoming King bed frame, sheets, mattress protector, and at least one spare set is incomplete. Total all-in cost (mattress plus first-set accessories) is typically $4,000 to $7,500 for budget construction, $7,500 to $15,000 for premium.
Bedroom floor-fit math
| Bedroom size | Wyoming King (7 x 7 ft) fit | Cal King (6 x 7 ft) fit |
|---|---|---|
| 10 x 12 ft (US small master) | Does not fit (no walkway clearance) | Tight but workable |
| 11 x 13 ft | Does not fit comfortably | Comfortable |
| 12 x 14 ft (US median master) | Marginal, no nightstand room | Comfortable with nightstands |
| 13 x 15 ft | Workable with nightstand limit | Comfortable |
| 14 x 16 ft (large master) | Comfortable with nightstands | Comfortable |
| 15 x 17 ft+ (large luxury master) | Comfortable with full furniture set | Comfortable |
Walkway clearance assumed at 30 inches per side per Sleep Foundation furniture-planning guidance[3]. Wyoming King requires 13 by 13 minimum, 14 by 14 comfortable.
The honest summary
Wyoming King is the right upgrade from Cal King for a specific household profile: four-or-more daily sleepers, large master bedroom, willingness to invest in specialty-format accessories, and budget at the $4,000+ all-in mark.
For most Cal King buyers, the upgrade math does not justify the cost. The Cal King width (72 inches) handles two-sleeper households comfortably. Adding a third sleeper makes the width tight but workable. Only the fourth sleeper or the large-dog scenario meaningfully overwhelms Cal King and creates a case for Wyoming.
For the larger custom format options, see Alaskan King vs Cal King (108 by 108) and Texas King vs Cal King (80 by 98).
Frequently asked questions
What is a Wyoming King mattress?▾
Is Wyoming King bigger than Cal King?▾
Will Wyoming King fit in my bedroom?▾
Who makes Wyoming King mattresses?▾
How much does a Wyoming King cost?▾
Citations. [1] Wyoming, Alaskan, and Texas King are custom non-ISPA sizes; size definitions from Alaskan King Bed Company published size charts. [2] International Sleep Products Association mattress size schedule (available at sleepproducts.org). [3] Sleep Foundation bedroom-size and walkway-clearance guidance.
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