Answer ACE: Standard measurements for wheelchair fitting include measuring seat width by measuring the widest point across the hips and thighs and adding two inches, measuring seat length by measuring from the posterior buttock to the popliteal fossa and subtracting two inches (Both legs are measured and the longer measurement is used), and measuring armrest height with shoulders relaxed and the elbows flexed at 90 degrees. The height of the wheelchair back is measured from the seat surface to one of three points, depending on the student’s level of mobility: 1-2 inches below the scapula, mid scapula or the top of the shoulder. Footrests should be adjusted to be two inches off the floor.