I have a really bad back, and I find that sitting on hard surfaces is preferable to soft surfaces. I'd like to figure out what the optimal height is for a seat for me so that I am not cutting off circulation by having my legs dangle, or exacerbating the bad back condition by having my feet too positively engaged to the floor.
Is there a commonly accepted wisdom with regards to seating height? Is there a universal standard or is it something that can be calculated based on the situation? I would assume the ergonomics of a person varies by that person.