A chandelier should relate to the floor area it serves and to the height of the ceiling. A useful residential starting point is to add the room length and width in feet. That sum is a starting diameter in inches. A 12-by-14-foot dining room points toward a fixture about 26 inches wide, adjusted for the table size and visual weight.
Over a dining table, keep the bottom about 30–36 inches above the tabletop. In an entry, leave at least 7 feet of clearance below the lowest point when people walk underneath. For a two-story foyer, choose by the volume of the opening. A fixture sized only to the floor footprint can look small once it is raised.
Check the hanging range, canopy size, and weight before installation. A heavy fixture needs a rated electrical box and, in some homes, additional support. The product page should be checked for the exact drop and for whether the chain or cable can be shortened.