There are six standard US mattress sizes: Twin (38×75 in), Twin XL (38×80), Full (54×75), Queen (60×80), King (76×80), and California King (72×84). Queen is the most popular for adults, and King is the widest. The full chart below lists every size in inches, centimeters, and feet, plus mattress depth and the sheet size each one takes.
Full US Mattress Size Chart
| Size | Inches (W×L) | Centimeters | Feet |
|---|---|---|---|
| Twin | 38 × 75 | 96 × 191 | 3.2 × 6.25 |
| Twin XL | 38 × 80 | 96 × 203 | 3.2 × 6.7 |
| Full (Double) | 54 × 75 | 137 × 191 | 4.5 × 6.25 |
| Queen | 60 × 80 | 152 × 203 | 5.0 × 6.7 |
| King | 76 × 80 | 193 × 203 | 6.3 × 6.7 |
| California King | 72 × 84 | 183 × 213 | 6.0 × 7.0 |
Mattress Depth (Thickness)
Length and width are standardized, but depth is not. Most mattresses are 8 to 14 inches thick, and the number matters for two reasons: it changes your total bed height, and it decides which fitted sheets fit. Measure your mattress depth and buy sheets rated for that pocket depth so they do not pop off.
| Mattress type | Typical depth |
|---|---|
| Low profile / slim | 6–8 in |
| Standard | 9–12 in |
| Thick / pillow-top | 13–16 in |
Which Mattress Size Should You Choose?
Pick the size by who sleeps in it and the room it goes in. A Twin suits kids and single sleepers; a Full works for one adult or a tight guest room; a Queen is the go-to for couples and most adults; a King gives couples the most shared width if the room can take it. A California King trades four inches of width for four inches of length, which suits taller sleepers.
Before you buy, make sure the size fits your room with walkway clearance. Check yours with the Bed Size Calculator, or see the worked best bed size for a 10×10 room. For headboard, nightstand, and clearance details, see the full bed & mattress size guide.
Frequently Asked Questions
A Queen mattress is 60 inches wide and 80 inches long (152 by 203 cm), or about 5 feet by 6.7 feet. It is the most popular size for adults and couples and fits comfortably in a room of at least 10 by 10 feet.
Neither is simply bigger — they trade width for length. A standard King is wider (76 by 80 inches), while a California King is narrower but longer (72 by 84 inches). The King suits couples wanting shared width; the California King suits taller sleepers or longer, narrower rooms.
A Full (Double) is 54 by 75 inches, while a Queen is 60 by 80 inches — six inches wider and five inches longer. The Queen’s extra room makes it much more comfortable for couples and taller adults, which is why it is the more popular choice.
Most standard mattresses are 9 to 12 inches thick. Slim and low-profile mattresses run 6 to 8 inches, while thick pillow-top models reach 13 to 16 inches. Check the depth before buying fitted sheets, since they are sized by pocket depth.
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