Mattress sizes are fixed, but the frame adds 2 to 6 in each way, and a headboard adds depth. Plan with the frame size from the product page, not the mattress.
Mattress sizes (US)
- Twin: 38 x 75 in
- Full: 54 x 75 in
- Queen: 60 x 80 in
- King: 76 x 80 in
Space around the bed
- 24 in on each side you get in from. 30 in feels comfortable.
- 30 to 36 in at the foot if it's a walkway, or if a dresser faces the bed (drawers need about 18 in to open, plus you).
- A closet or bedroom door must open fully without hitting the bed.
The rule of thumb
A queen with a frame is about 64 x 86 in. With 24 in on both sides and 30 in at the foot you need a room about 9 ft 4 in wide and 9 ft 8 in long. In a 9 x 10 ft bedroom (108 x 120 in) a queen leaves room to walk on one side only, so one side goes against the wall; a full frame is about 6 in narrower.
See it in your room
Photograph the empty bedroom from a corner, tap the wall the headboard goes on and the top of a door, and Fits Here places a queen at real size, with the clearance on each side.