The California Design Den guide
Mattress size guide: every bed size, every dimension
Picking a mattress size sets up every bedding decision that follows — sheets, duvet, pillowcases all flow from this one choice. Here are the exact dimensions of every standard US mattress size, in inches and centimeters, plus an honest take on who each size suits.
| Mattress size | Inches (W Ă— L) | Centimeters | Best for |
|---|---|---|---|
| Twin | 38" Ă— 75" | 96.5 Ă— 190.5 cm | Kids' rooms, bunk beds, small guest rooms |
| Twin XL | 38" Ă— 80" | 96.5 Ă— 203 cm | Dorms, taller solo sleepers, split king halves |
| Full | 54" Ă— 75" | 137 Ă— 190.5 cm | Solo adults, snug guest rooms |
| Queen | 60" Ă— 80" | 152.5 Ă— 203 cm | Couples; the most popular US size |
| King | 76" Ă— 80" | 193 Ă— 203 cm | Couples who want room |
| California King | 72" × 84" | 183 × 213.5 cm | Taller sleepers — 4" longer, 4" narrower than king |
| Split King | 76" Ă— 80" (2 Ă— 38" Ă— 80") | 193 Ă— 203 cm | Adjustable bases; different firmness per side |
Need sheet, duvet or pillowcase dimensions, or these in feet? Open the bedding size converter
US Mattress Sizes
Which size is right for you?
- Sleeping solo? Full gives you sprawl room; twin XL if the room is tight but you're tall.
- Two people? Queen is the default for a reason; king if the bedroom is 12' Ă— 12' or larger; cal king if either of you is over 6'2".
- Adjustable base? Split king — two twin XLs side by side. Split king guide