The width of a recliner is determined by the distance between the armrests and the center of the seat, while the depth of the chair is determined by the distance between the backrest and the seat. The width of a recliner chair between the arms is going to vary depending on the type of recliner chair, but it’s typically going to be between 18″ and 24″. The width of a recliner is determined by the distance between the armrests and the center of the seat, while the depth of the chair is determined by the distance between the backrest and the seat.