Room size for a twin xl bed
The Sleep Foundation recommends about 24 inches of space around each side of the bed. With 24 inches on both sides and at the foot, a twin xl needs a clear floor area of at least 86 x 104 inches (7' 2" by 8' 8"), before you add nightstands or a dresser. The mattress itself covers 21.1 square feet.
Compared with other sizes
| Size | Inches | Difference vs Twin XL |
|---|---|---|
| Twin | 38 x 75 | same width, -5 in long |
| Full (double) | 54 x 75 | +16 in wide, -5 in long |
| Queen | 60 x 80 | +22 in wide, same length |
| King | 76 x 80 | +38 in wide, same length |
| California King | 72 x 84 | +34 in wide, +4 in long |
Mattress dimensions are for the mattress itself. Bed frames and headboards add to the footprint, so check the frame's listed size when you plan the room.
Frequently asked questions
How big is a twin xl bed?
A twin xl mattress is 38 x 80 inches (97 x 203 cm), or 3' 2" by 6' 8". Bed frames add a few inches, depending on the frame.
What size room do I need for a twin xl bed?
The Sleep Foundation recommends about 24 inches of space around each side of the bed. With 24 inches on both sides and at the foot, a twin xl needs a floor area of at least 86 x 104 inches (7' 2" by 8' 8"), before nightstands and dressers.
Sources: Sleep Foundation, "Mattress Sizes and Dimensions" (updated Jul 11, 2025); Wayfair, "How to Choose the Right Rug Size". Checked October 17, 2026. How we check.