What is the standard seat width for office chairs?

Standard commercial office chairs have a seat width of 17"–20", with 18"–19" being the most common. Big-and-tall chairs have seats at 20"–24". Seat width should leave 1"–2" of clearance on each side of the hips. FindOfficeFurniture.com includes seat width dimensions on every chair spec — call 888-719-4960 for help matching a chair to specific measurements.