King Mattress Size Guide
The King is the widest standard US mattress — 16 inches wider than a Queen, ideal for couples who want maximum personal space or those who co-sleep with children or pets.
About the King Size
The King mattress measures 76 inches wide by 80 inches long — 16 inches wider than a Queen. At over 6 feet wide, a King mattress gives each partner approximately 38 inches of personal sleeping space, equivalent to a Twin XL width. This extra space is transformative for couples where motion transfer is a concern, those with pets or children who share the bed, or simply those who prefer more personal room during sleep. The King's footprint requires a larger room — most interior designers recommend a room of at least 12×12 feet to maintain adequate walking space around the bed. King-size bedding, while available everywhere, is priced significantly higher than Queen at every tier. Box springs and bed frames for Kings are also heavier and more expensive. For couples with the room and budget, a King delivers a qualitative improvement in sleep comfort that reviewers consistently describe as 'game-changing.'
Best For
- ✓Couples wanting maximum space
- ✓Families who co-sleep with children or pets
- ✓Restless or hot sleepers sharing a bed
- ✓Large master bedrooms (12×12+ feet)
- ✓Those with adjustable bases (use two Twin XL for Split King)
Not Ideal For
- ✗Rooms under 12 feet wide
- ✗Budget-sensitive buyers (King-size everything costs more)
- ✗Single sleepers (Queen is more than sufficient)
Top Mattresses Available in King
Lucid's mid-size budget memory foam with bamboo charcoal and gel infusion — widely available at major retailers and a strong value pick in the under-$350 queen segment.
The quintessential starter mattress — Linenspa's entry-level bonnell coil hybrid with a thin memory foam layer, widely available at major retailers for under $250 queen.
Allswell's 10-inch Hybrid uses gel memory foam over pocket coils with a firm support profile and Walmart fulfillment.
Allswell's entry hybrid pairs gel memory foam with pocket coils in a 10-inch, firm-feel build sold at Walmart.
Zoma's entry-level foam — Triangulex zone foam designed to accelerate muscle recovery during sleep. Budget price point with sports-recovery positioning.
The Allswell Luxe Medium is a 12-inch medium-firm hybrid with memory foam, pocketed coils, and a cool-to-touch fabric.
King Size — Frequently Asked Questions
How much wider is a King than a Queen?
A King is 76 inches wide vs. a Queen's 60 inches — a 16-inch difference. Each partner on a King gets 38 inches of personal space (twin-XL width) vs. 30 inches on a Queen.
What room size do I need for a King?
Minimum 12×10 feet with adequate walking space. Most design guidelines recommend 12×12 feet or larger for a King with comfortable clearance on all sides and at the foot.
King vs. California King — which should I choose?
King (76×80) is wider; California King (72×84) is narrower and longer. Choose King for width (couples, restless sleepers). Choose Cal King for length (adults over 6'4") or narrower rooms. Cal King bedding is harder to find than King.
Can a King fit through a standard door?
King mattresses shipped as compressed 'bed in a box' fit through standard doors. Traditional innerspring Kings must be maneuvered — delivery teams are experienced at this but tighter stairwells can be challenging. White-glove delivery (Saatva, etc.) handles setup.
Is King bedding significantly more expensive?
Yes — King sheets typically cost 20–40% more than the same Queen sheet set. King comforters, duvet inserts, and protectors follow similar premiums. Budget this ongoing expense into your decision.