To know the width of your chandelier, measure the height and width of your room in feet where you want to place it. Adding these two numbers gives the width of the chandelier and for height, multiply the space between floor and ceiling by 3 feet. For example, if your room’s length is 10 feet X 16 feet and the ceilings are 8 feet high. Then, the chandelier's width will be 26 feet and height 24 feet.