Wall Bracket For the amount of Excelling needed, measure the room’s perimeter and calculates square footage Divide the perimeter of the room by 8 and round up to the nearest whops number. ¥ of Places Top Hanger Divide the square footage of the room by 16 and round up io the nearest whole number. Runner Divide the quantum footage of the room by 18 and round up fo the nearest hols numerable.