Room size for a full (double) 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 full (double) needs a clear floor area of at least 102 x 99 inches (8' 6" by 8' 3"), before you add nightstands or a dresser. The mattress itself covers 28.1 square feet.
Compared with other sizes
| Size | Inches | Difference vs Full (double) |
|---|---|---|
| Twin | 38 x 75 | -16 in wide, same length |
| Twin XL | 38 x 80 | -16 in wide, +5 in long |
| Queen | 60 x 80 | +6 in wide, +5 in long |
| King | 76 x 80 | +22 in wide, +5 in long |
| California King | 72 x 84 | +18 in wide, +9 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 full (double) bed?
A full (double) mattress is 54 x 75 inches (137 x 190 cm), or 4' 6" by 6' 3". Bed frames add a few inches, depending on the frame.
What size room do I need for a full (double) 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 full (double) needs a floor area of at least 102 x 99 inches (8' 6" by 8' 3"), 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.