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Mattress sizes can be confusing -- especially when brands use different names for the same dimensions. This complete guide covers every standard US mattress size, who each fits, and which rooms they work in.
US Mattress Sizes: Complete Dimensions Chart (2026)
| Size | Width | Length | Best For | Min. Room Size |
|---|---|---|---|---|
| Twin | 38" | 75" | Kids, bunk beds, solo sleepers | 7 x 10 ft |
| Twin XL | 38" | 80" | Tall solo sleepers, dorms | 8 x 10 ft |
| Full (Double) | 54" | 75" | Teens, solo adults, guests | 10 x 10 ft |
| Queen | 60" | 80" | Couples, solo adults, master bedrooms | 10 x 12 ft |
| King | 76" | 80" | Couples who want space, large rooms | 12 x 12 ft |
| California King | 72" | 84" | Tall sleepers (6'2"+), large master bedrooms | 12 x 12 ft |
| Split King | 76" (2x38") | 80" | Couples with different sleep needs | 12 x 12 ft |
Twin vs Twin XL
The only difference is length: Twin XL is 5 inches longer (80" vs 75"). College students should choose Twin XL -- most dorms use 38 x 80 in frames. Kids and bunk beds typically use standard twin.
Budget Pick
Sweetnight Twilight Hybrid — From $329
Medium-firm 6/10, pocket coils, HSA eligible. 100-night trial.
Full vs Queen
Queen is 6 inches wider and 5 inches longer than full. For solo sleepers in rooms under 10 x 12 ft, full works well. Couples and taller sleepers should go queen. See our full queen vs full comparison for details.
King vs California King
King (76" x 80") is 4 inches wider than California King (72" x 84"). Cal King is 4 inches longer. Choose king if your room is wider than it is long. Choose Cal king if you or your partner are over 6'2".
Which Mattress Size Should You Buy?
| Situation | Recommended Size |
|---|---|
| Child under 12 | Twin |
| Teen or college student | Twin XL |
| Solo adult, tight room | Full |
| Solo adult, standard room | Queen |
| Couple, standard master bedroom | Queen |
| Couple, large bedroom, need space | King |
| Tall sleeper (6'2"+) with partner | California King |
| Couple with different firmness needs | Split King |
Best Mattresses By Size
Twin/Twin XL: Sweetnight Island (budget, $199-$249) | Amerisleep AS2 (durable, $1,099)
Full: Puffy Original Full ($499, 101-night trial)
Queen: Sweetnight Breeze Queen ($499, cooling hybrid) | Amerisleep AS3 Queen ($1,299, premium)
King/Cal King: Puffy Lux King ($1,699) | Amerisleep AS3 King ($1,699)
Frequently Asked Questions
What is the most popular mattress size?
Queen is the most popular mattress size in the US, accounting for roughly 40% of mattress sales. It's the ideal balance of sleeping space and room-friendliness for most adults and couples.
Is a king or California king bigger?
A standard king (76" x 80") has more total surface area than a California king (72" x 84"). King is wider; Cal King is longer. Cal king works best for very tall sleepers, not as a general bigger option.
What mattress size fits two adults comfortably?
Queen is the minimum recommended size for two adults -- it gives each person 30 inches. King provides 38 inches per person, similar to a twin each. If you have the room and budget, king is significantly more comfortable for couples.