Size chart
| Size | Inches | Centimeters | Feet |
|---|---|---|---|
| Twin | 38 x 75 | 97 x 190 | 3' 2" x 6' 3" |
| Twin XL | 38 x 80 | 97 x 203 | 3' 2" x 6' 8" |
| Full (double) | 54 x 75 | 137 x 190 | 4' 6" x 6' 3" |
| Queen | 60 x 80 | 152 x 203 | 5' x 6' 8" |
| King | 76 x 80 | 193 x 203 | 6' 4" x 6' 8" |
| California King | 72 x 84 | 183 x 213 | 6' x 7' |
How much room each bed needs
The Sleep Foundation recommends about 24 inches of space around each side of the bed. That gives these minimum floor areas before nightstands and dressers:
| Size | Floor area with 24 in on both sides and the foot |
|---|---|
| Twin | 7' 2" x 8' 3" |
| Twin XL | 7' 2" x 8' 8" |
| Full (double) | 8' 6" x 8' 3" |
| Queen | 9' x 8' 8" |
| King | 10' 4" x 8' 8" |
| California King | 10' x 9' |
Quick comparisons
- Queen vs king: a king is 16 inches wider (76 vs 60), the same length.
- King vs California king: the California king is 4 inches narrower and 4 inches longer.
- Twin XL: two twin XL mattresses side by side make 76 x 80, the size of a king.
- Full vs queen: a queen is 6 inches wider and 5 inches longer.
Source: Sleep Foundation, "Mattress Sizes and Dimensions" (updated Jul 11, 2025).
