In seating guidelines, the 2-inch seat depth increment corresponds to the width of how many fingers?

• A. Five fingers
• B. Three or four fingers
• C. Ten fingers
• D. One or two fingers

Answer: (B)

The concept here is using finger-width estimates to size seating dimensions. In practice, a 2-inch change in seat depth is aligned with about three to four finger widths, give or take, since finger width varies between individuals. This quick rule helps fit the seat so the edge isn’t pressing into the back of the knee while still providing solid thigh support and pelvic alignment. Using three or four fingers as the guide offers a balance between too-deep and too-shallow seat depth, whereas a smaller or larger finger count would make the adjustment less precise and could lead to improper pressure distribution or poor posture.