Each side of each bumper will need a piece 62x12. If you must have the fabric in a single strip, then you'll need 62 of fabric at least 48 wide, so buy a minimum of 1 3/4 yards. If the fabric is narrower than 48, then you'll need 3.5 yards. If you want bumpers for the head and foot, you'll need a total of 4 additional pieces, headboard width + 2x12. Source(s): 50 years of sewing. kay · 4 years ago.