Mid-Back Mesh Adjustable Office Computer Chair w/ Arms, Grey Seat Size: 19.75''W x 18.5''D Seat Height: 18.5'' - 22.5''H Arm Height: 8.25''H From Seat; 27''H From Floor Back Size: 20.5''W x 20.25''H Overall Dimensions: 23.75''W x 24''D x 38.25'' - 42.25''H