What is the seat diameter of a typical drafting stool?

Round drafting stool seats typically measure 15"–18" in diameter. Rectangular or contoured seats measure approximately 17"–19" wide by 16"–18" deep. Big and tall models have wider seats — 20" wide or more. Seat diameter is less critical than seat depth and width for ergonomic fit — ensure the seat pan is wide enough for the user's hips with 1"–2" of clearance on each side. At OfficeFurniture2go.com, all product specs include seat dimensions — call 1-800-460-0858 for sizing guidance.