The top of the seat back measures approximately 15” off the top of the seat. An accessory Seatback Height Adjustment Kit is available for those needing higher or lower back support. Generally speaking, unless the user is 6’-2” or taller, he or she should be fine with the standard seat back. Of course, a number of factors come into play which might negate such generality, most obviously, the nature and/or severity of the user's disability.