Beds & Headboards
A headboard is sized to the mattress rather than the wall. A queen wants 60 to 64 inches of width, a king 76 to 80, a full 54 to 58. Two to four inches of overhang each side reads deliberate; matching the mattress exactly reads tight.
Height above the mattress runs 14 to 20 inches for a low modern look and 24 to 30 for something more substantial. Mattress depth changes the proportion, so measure from the top of the mattress you own. Every piece is made to order.