How do I determine the right size for my chandelier?

A chandelier should be approx. half the width of your dining room table and approx. 30" above the top of the table. Ceilings higher than 8' raise the height of the chandelier about 3-4"

What size chandelier should I get for my foyer?

The approx. diameter can be determined by adding the length and the width. Example: for a 12x14 room the diameter would be 26".

How do I determine the amount of light I need for a room?

Multiply the square feet by 1.5. This would be the wattage needed.