Quick Answer: King or California King: which is bigger? A King (76" x 80") is 4 inches wider than a California King (72" x 84"), which is 4 inches longer. The Sleep Foundation recommends a King for couples sharing the bed with children or pets, and a California King if either sleeper stands over 6 feet tall.
Brad, Owner since 1987: "We have been helping Brantford families sleep better since 1987. Every customer gets personal attention, honest advice, and the kind of follow-up service you just do not get from big box stores."
4 min read • Last updated: February 25, 2026
The Dimensions That Matter
- King (Eastern King): 76 inches wide x 80 inches long (193 x 203 cm), 6,080 square inches
- California King: 72 inches wide x 84 inches long (183 x 213 cm), 6,048 square inches
The total sleeping surface is nearly identical (just 32 square inches difference). The difference is in how that space is distributed: wider for the King, longer for the Cal King.
When to Choose a King
The standard King is the more popular choice in Canada, and for good reason:
- Couples who want space: Each person gets 38 inches of width, which is the same as an entire Twin mattress per person. This is genuine personal space
- Kids or pets in bed: If your children or dog regularly join you, the extra 4 inches of width makes a noticeable difference
-
Average to tall sleepe
rs: At 80 inches long (same as a Queen), the King works for anyone up to about 6'2" - Bedroom compatibility: King mattress accessories (sheets, frames, headboards) are more readily available and often cheaper than Cal King equivalents
When to Choose a California King
The Cal King was originally designed in the 1960s for tall California residents who wanted more legroom:
- Tall sleepers: If either partner is over 6'2", the extra 4 inches of length prevents feet from hanging off
- Narrow, long bedrooms: Some older homes and condos have bedrooms that are longer than they are wide. A Cal King fits better in these spaces
- Adjustable base preference: Some premium adjustable frames are designed specifically for Cal King dimensions
Bedroom Size Requirements
King: Minimum room 12 x 12 feet for walking space on three sides
California King: Minimum room 12 x 12 feet (works in 11 x 13 rooms due to narrower width)
Quick decision:
Both under 6'2"? Get a King.
Either over 6'2"? Get a Cal King.
Narrow bedroom? Get a Cal King.
Kids/pets in bed? Get a King.
Not sure? Get a King (more versatile).
Accessories and Availability in Canada
This is where the practical difference becomes clear. Standard King bedding is everywhere: every Canadian retailer carries King sheets, duvets, and bed frames in abundance. California King accessories are available but the selection is smaller, and prices are sometimes higher.
When shopping for a Cal King, you may need to order bedding online rather than finding it in local stores. This is improving, but it is still a consideration. Bed frames, headboards, and foundations for Cal King also have a smaller selection.
Width vs Length: What Research Says
Sleep research consistently shows that width matters more than length for sleep quality, as long as length is adequate. A study from the Sleep Research Society found that couples sleeping on wider surfaces had fewer nighttime awakenings and reported better sleep quality. This suggests that for most couples of average height, the standard King wider dimensions provide better sleep than the Cal King extra length.
The Split King Option
If you and your partner have different firmness preferences, consider a split King: two Twin XL mattresses (each 38" x 80") on one King frame. Each person gets their ideal firmness, and the combined dimensions are exactly a King (76" x 80"). This also works with adjustable bases, letting each person raise their
head or feet independently. There is no split California King equivalent that works as cleanly.
Both Sizes in Our Brantford Showroom
We carry both King and California King mattresses at Mattress Miracle so you can see the size difference in person. We find that many customers think they need a Cal King but realize a standard King gives them everything they need once they see both. We are happy to help you figure out the right choice for your bedroom and your height. Straightforward advice since 1987.
Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1987. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
Can I use King sheets on a California King?
No. King and California King sheets have different dimensions and are not interchangeable. King sheets will be too wide and too short for a Cal King. Always match sheets to your exact mattress size.
Which costs more, King or California King?
The mattress itself is usually the same price in both sizes. However, Cal King accessories (sheets, duvets, frames) can cost 10-20% more due to lower demand and less competition among retailers.
Can I fit a King mattress through a standard doorway?
Standard Canadian doorways are 32-36 inches wide. A King mattress is 76 inches across but can be turned on its side and flexed (if not innerspring) through most doorways. Plan your delivery path in advance, especially for second-floor bedrooms.
Is a California King the biggest mattress?
The Cal King is the longest standard mattress at 84 inches. The standard King has the most total surface area of standard sizes. Custom sizes larger than both are available from specialty manufacturers.
Do hotels use King or California King?
Most Canadian and American hotels use standard King mattresses. California King beds are rare in hotels, which means most people are accustomed to the King size and feel at home on it.
Visit Mattress Miracle
Find us at 441 1/2 West Street, Brantford, Ontario. Rated 4.9 stars on Google. Family-owned since 1987.
Sources
- Radwan A, Fess P, James D, et al. Effect of different mattress designs on promoting sleep quality, pain reduction, and spinal alignment in adults with or without back pain. Sleep Health. 2015;1(4):257-267. DOI: 10.1016/j.sleh.2015.08.001
- Verhaert V, Haex B, De Wilde T, et al. Ergonomics in bed design: the effect of spinal alignment on sleep parameters. Ergonomics. 2011;54(2):169-178. DOI: 10.1080/00140139.2010.538725
- Okamoto-Mizuno K, Mizuno K. Effects of thermal environment on sleep and circadian rhythm. J Physiol Anthropol. 2012;31(1):14. DOI: 10.1186/1880-6805-31-14
- Cary D, Briffa K, McKenna L. Identifying relationships between sleep posture and non-specific spinal symptoms in adults: A scoping review. BMJ Open. 2019;9(6):e027633. DOI: 10.1136/bmjopen-2018-027633
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available, wheelchair accessible. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle , 441½ West Street, Brantford, ON · (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.