King Mattresses
One of the largest mattress sizes on the market, king size mattresses measure 76” wide by 80” long. BedInABox® king size mattresses provide plenty of bed for anyone who needs more sleeping space.
How big is a king size mattress?
A standard king size mattress is 76 inches wide by 80 inches long.
Who should sleep on a king mattress?
Couples & Families
King mattresses give couples plenty of sleeping space, often enough for the kids or pets to climb in, too.
Primary Bedrooms
The king size bed is perfect for most primary bedrooms with 16 more inches of elbow room than the queen size.
Quality comfort, risk-free
Try your king mattress in a box risk-free for 120 nights. If you don’t love your new BedInABox® after sleeping on it for 60 nights, let us know and we will get the return process started. Details can be found in our Return Policy.
Certified king-size support
All of the memory foam we develop for our king size memory foam mattresses is CertiPUR-US® certified. This means that the foam has been tested by accredited labs and has been certified as safe to sleep on. We use multiple layers of our house-made memory foam to provide the perfect balance of support and pressure relief, for all sleepers.
Sleep now, pay later
We partner with Affirm to offer flexible financing options, so you can pay with fixed monthly payments with rates between 0-30% APR. Simply select Affirm at checkout and complete an application that won’t affect your credit score. Prequalify Now.
Buying a Foundation for a King Size Bed
Create a more supportive sleeping experience by pairing your king size mattress with a king size foundation. A mattress foundation serves as a base for your mattress and generally uses solid planks or slats to support and lift your mattress off the ground. There are different types of foundations suited to different mattresses and sleep preferences, BedInABox® currently offering three options compatible with a king mattress: a slatted foundation, a platform foundation and an adjustable foundation.
Clever Connect™
Provides simple, slatted support for memory foam or hybrid mattresses. This sturdy foundation is available in a 5” profile or an 8” profile and can be paired with optional foundation legs for additional height.
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Platform BedInABox®
Best described as a combination of a standard mattress foundation and a decorative bed frame, our upholstered platform offers a slightly lower profile than pairing a solid foundation with a separate bed frame and is compatible with all BedInABox® mattresses.
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MotionInABox™ Adjustable Beds
Solid mattress bases that can be raised or lowered to create a custom sleep experience. The MotionInABox™ adjustable bases are available in two different models, MotionInABox™ 1.0 and MotionInABox™ 2.0, both in the Split King size compatible with standard king size mattresses.
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Which King Size SD is right for you?
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| King Starting Price | $999 | $2,199 | $2,071 | $1,639 | $1,899 |
| Trial Period | 120 Nights | 365 Nights | 365 Nights | 100 Nights | 100-365 Nights |
| Warranty | 20 Year Limited | Limited Lifetime | Limited Lifetime | Limited Lifetime | 10-25 Year Limited |