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Choosing the wrong mattress size is a costly mistake. Here’s a complete guide covering every standard mattress dimension and who each suits best.
Standard Mattress Sizes
Twin: 38″ × 75″ | Twin XL: 38″ × 80″ | Full: 54″ × 75″ | Queen: 60″ × 80″ | King: 76″ × 80″ | Cal King: 72″ × 84″
Twin (38″ × 75″)
Designed for single child sleepers, bunk beds, and trundle frames. Too short for adults over 5’5″ — consider Twin XL instead.
Twin XL (38″ × 80″)
Five inches longer than a standard twin. The US college dormitory standard. Also used in Split King configurations for couples on adjustable bases.
Full/Double (54″ × 75″)
More width for a single adult. Two adults share only 27″ each — cramped for most couples. Best for single adults or teen room upgrades. Too short for those over 5’10”.
Queen (60″ × 80″)
The most popular size in America. Fits most bedrooms (10’×10′ minimum). Each couple partner gets 30″ of width. The best balance of space, cost, and room compatibility for most buyers.
King (76″ × 80″)
Gives each partner 38″ of width — equivalent to a twin each. Ideal for co-sleeping with children or pets. Requires a bedroom of at least 12’×12′.
California King (72″ × 84″)
Four inches narrower but 4 inches longer than a standard King. Best for tall sleepers over 6’2″. If neither partner is very tall, the standard King’s extra width is more useful.
Room Size Guidelines
Twin: 7’×10′ minimum. Full: 9’×10′. Queen: 10’×10′ minimum. King: 12’×12′ minimum. Allow at least 24″ clearance on each side and at the foot of the bed.