By roomAdd the room’s length and width in feet. The answer is the fixture’s diameter in inches — a 13 × 16 ft room wants about 29 in.
- The rule
- Add the room’s length and width in feet. The answer is the fixture’s diameter in inches — a 13 × 16 ft room wants about 29 in.
- Height under the ceiling
- Allow 2.5 to 3 inches of fixture for every foot of ceiling. Under a standard 9 ft ceiling that is an overall height of 22 to 27 in.
- The lowest point
- Anywhere people walk, the lowest point stays at least 7 ft above the floor. Over a dining table it is the opposite — 30 to 34 in above the top, because nobody walks there.
