Calculate the right size. To keep tall guests from bumping their heads on your chandelier as they get up from their seats consider the size of your light. Using a measuring tape, calculate the width of the table and subtract one foot. For example, if your dining table is 38” wide, you will be looking for a chandelier that is 26” wide. The reason for this is so you don’t end up with a light that looks too small or too large over your table, and tall guests won't bump their heads on your chandelier as they get up from their seats.