King Mattresses(111+)

How to Choose the Right King Size Mattress?

A king size mattress gives you the most sleep surface of any standard bed size. If you have the room for it, it is hard to go back.

A king mattress measures 76 by 80 inches, giving couples about 38 inches of width each, which is the same as a twin mattress per person. The extra space really makes a difference for better sleep, especially if you share the bed with a partner, pet, or restless kid. Sam's Club carries king size mattresses in memory foam, hybrid, innerspring, pillow top and euro top styles across every firmness level.

Is a King Mattress Right for Your Room

A king mattress fits best in a room that is at least 12 by 12 feet. 13 by 13 or larger gives you space on all sides to move around comfortably. If your room is longer and narrower, a California king mattress is 72 by 84 inches (four inches narrower and four inches longer) and  might work better in the room layout. Both are great master bedroom mattresses for couples who want maximum space.

Choosing Type and Firmness for a King

With a king size mattress, motion isolation is especially important for couples. A memory foam mattress absorbs motion transfer well, so one sleep partner does not disturb the other. A hybrid mattress adds the bounce and airflow of coils alongside foam comfort layers, which makes it a strong pick for hot sleepers. For firmness, match your preferred sleeping position: side sleepers do well on soft to medium, back sleepers on medium-firm, and stomach sleepers on a firm mattress for proper spinal alignment and lower back support.

Sam's Club members get free shipping and white glove delivery on many king mattress orders, plus exclusive pricing on brands like Sealy, Serta, Beautyrest and Member's Mark. Pair your king mattress with a matching foundation or mattress set for a complete bedroom upgrade.

Why Shop Sam’s Club for King Size Mattresses?

• White Glove Mattress Delivery: Plus Members get free white glove delivery on select king size mattresses. This service includes in-room setup and optional mattress removal.
• Member-Only Value: Members get exclusive pricing on king mattresses.
• Member’s Mark Quality: Shop the Member’s Mark king mattress collection for high-quality options without the high price tag.
• Satisfaction Guarantee: In addition to the manufacture warranty, most king size mattress purchases are covered by our Satisfaction Guarantee if the item does not meet your comfort needs.