Question: how wide are slats for a queen bed?
Answer: Calculate the Slats Calculate the number of slats you need based on the width of the slats and the standard spacing. Slats typically are made with 1 x 3 or 1 x 4 lumber: 1 x 3s are 2 1/2 inches wide, and 1 x 4s are 3 1/2 inches wide (both are about 3/4 inch thick). A queen mattress is 80 inches long.