How big should a box spring be?
While a box spring should be the same width and length of your mattress, the actual thickness of the box spring matters very little. The thickness of a box spring can be determined by your preference. The amount of support provided is the same, regardless of the thickness of the box spring. A thicker box spring may be more desirable for aesthetic reasons, but thinner box springs are easier to maneuver and can be more easily moved for cleaning.
