What size chandelier for a 12x12 room?
49–61 cm (19–24 in) across, for a room 12 × 12 ft
A 12 × 12 ft room suits a chandelier or pendant about 49–61 cm (19–24 in) across: add the room's two sides in feet and read the sum as inches. Over open floor its bottom must stay 210 cm (83 in) up, and a 2.4 m (7 ft 10 in) ceiling leaves only 30 cm (12 in) for the whole fitting, so choose a shallow one.
The rule sizes the light to the room, so that it neither disappears nor fills the ceiling. It is for a light in the middle of a room. Over a dining table, ignore it and size the light to the table's width instead.
Width is only half of it. A wide chandelier is usually a tall one, and under a standard ceiling a tall fitting hangs where heads are. In a room people walk through, the height limit decides what you can hang long before the width rule does.
Worked out for A room 12 × 12 ft (3.66 × 3.66 m) with a 2.4 m (7 ft 10 in) ceiling, and one light in the middle over open floor, not over a table. Change the numbers
The working
- Diameter = (room length + width) ÷ 12 for the feet-and-inches rule, ÷ 15 for the metric one: 49–61 cm.
- Keep 210 cm clear from the floor to the bottom of the light.
- Drop = 240 − 210 − 30 (fitting) = 0 cm.
One UK lighting shop gives 200 cm as the least; we use 210 cm, The Lighting Centre's figure.
The rules, and their sources
The room rule for a light's size
The room rule: add the room's length and width in feet, and the sum in inches is the light's diameter. In cm, that is (length + width) ÷ 12. The Lighting Centre's metric version, (length + width) ÷ 15, gives a smaller light.
A rule designers use Sources: Mod Lighting (2 Jan 2025), How to find the right chandelier size (checked 31 October 2026); The Lighting Centre (NZ), How to size a pendant ((length + width in metres) ÷ 15 = diameter in metres) (checked 31 October 2026).
Headroom under a hanging light
Where people walk under a light, keep its bottom at least 2.1 m from the floor. Jim Lawrence gives at least 2 m (7 ft) in sitting rooms, bedrooms and halls.
A rule designers use Sources: The Lighting Centre (NZ), How to size a pendant (checked 31 October 2026); Jim Lawrence, Lighting FAQ (checked 31 October 2026).
Other room sizes
The room rule for each size. The small figure is the metric version of the rule, the large one the feet-and-inches version.
| Room | Light's width |
|---|---|
| 10 × 10 ft3.05 × 3.05 m | 41–51 cm (16–20 in) |
| 12 × 10 ft3.66 × 3.05 m | 45–56 cm (18–22 in) |
| 12 × 12 ft3.66 × 3.66 m this page | 49–61 cm (19–24 in) |
| 15 × 12 ft4.57 × 3.66 m | 55–69 cm (22–27 in) |
| 20 × 15 ft6.1 × 4.57 m | 71–89 cm (28–35 in) |
Change the numbers
Your sizes will differ. The pendant light height and size calculator opens with these numbers filled in: change any of them and the answer, the working and the drawing follow.
Editorial notes
Worked out by the Snuug team on 12 November 2026 with the same code as the pendant light height and size calculator, so the two cannot disagree. Every rule cites its source, with the date we last checked it. A rule designers use is a convention, not a study.