Side Sleeper King Mattresses
76” wide by 80” long
A king mattress measures 76” wide by 80” long — the widest standard mattress size, giving each partner 38 inches of personal space (the same width as a twin).
It’s the top choice for couples who want maximum sleeping room, families who co-sleep with young children, anyone with a larger master bedroom, and sleepers who simply prefer to spread out.
Every king mattress at National Mattress ships free across Canada with a 365-night sleep trial, price match guarantee, and 5–25 year manufacturer’s warranty.
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How to Choose a King Size Mattress in Canada
A standard Canadian king mattress measures 76″ × 80″ (193 cm × 203 cm), providing each partner with 38 inches of personal sleeping width — roughly the same as a Twin XL. That extra space makes a king ideal for couples, co-sleeping families, and anyone who simply prefers room to stretch. Ensure your bedroom has at least 12″ × 12″ (3.7 m × 3.7 m) of floor space so you can walk comfortably around the bed. If a standard king is too wide, consider a Queen (60″ × 80″) instead.
National Mattress carries 240+ king mattresses across five construction types: eurotop/pillowtop, traditional tight-top, memory foam, hybrid, and latex. Pocket-coil and hybrid models with zoned lumbar support suit back sleepers who need spinal alignment, while memory foam and plush eurotops conform to pressure points for side sleepers. Over 91% of our king mattresses are compatible with adjustable bases, and every model carries CertiPUR-US® certification for foam safety.
240+ Models, 10 Brands
Shop king mattresses from Serta, Beautyrest, Sealy, Tempur-Pedic, Springwall, Stearns & Foster, iComfort, Chirofoam, Evergreen, and NM.
$178 – $6,640
From budget-friendly great-value foam models to luxury Tempur-Pedic and Stearns & Foster collections — king mattresses at every price point.
Canadian-Made
100% of National Mattress mattresses are manufactured in Canadian factories with CertiPUR-US® certified foams and free delivery coast to coast.
91% Adjustable-Base Ready
Most king mattresses work with adjustable bases — check individual product pages for compatibility or browse our top picks.
Frequently Asked Questions About King Size Mattresses
What are the dimensions of a king size mattress in Canada?
How much should I spend on a king size mattress?
What type of king mattress is best for couples?
Can I use a king mattress on an adjustable base?
Do king size mattresses ship free across Canada?
What firmness level should I choose for a king mattress?
Not Sure Which King Mattress Is Right for You?
Our non-commissioned sleep experts match you to the perfect king mattress based on your sleep style, body type, and budget — no sales pressure, just honest guidance.
Upgrade your sleep at National Mattress
Discover a mattress that transforms your sleep into a truly rejuvenating experience. We offer a wide variety of options to suit every sleep style and preference, ensuring a better night's sleep.
Why Choose Us?
- Variety: From plush to firm, we have options for every body type and sleep style.
- Quality: Trusted brands and top-notch materials for long-lasting comfort.
- Sleep Trials & Warranties: Enjoy peace of mind with flexible trials and warranties.
- Expert Advice: Get personalized recommendations from our sleep specialists.
Mattress Selection Includes
- Memory Foam: Contours to your body for personalized comfort and pressure relief.
- Hybrid: Combines responsive springs with foam for balanced support and comfort.
- Innerspring: Provides firm support, bounce, and cooling airflow.
- Latex: Hypoallergenic, eco-friendly, and exceptionally comfortable.
- Adjustable Beds: Customize your sleep position for optimal comfort.
