Most chandeliers look wrong for one of two reasons: too small for the room, or hung too low. Both are easy to avoid with two measurements.

Diameter: the room-total rule

Measure the length and the width of the room in feet and add the two numbers together. Use that total as the diameter of the fixture in inches.

• A 12 ft × 14 ft room totals 26 → look for a chandelier around 26 in (66 cm) across.
• For an open-plan space, treat each zone — dining, seating, stairwell — as its own room.

Over a dining table

Size the fixture to roughly half to two-thirds of the table's width, and leave 30–36 in (76–91 cm) between the bottom of the fixture and the tabletop. That keeps faces visible across the table while keeping the light close enough to read by.

Over a kitchen island

For a single fixture, two-thirds of the island length is a comfortable proportion. For two or three smaller pendants, divide the island into equal segments and leave 24–30 in (61–76 cm) between each fixture.

When the ceiling is high

Tall rooms tolerate — and usually need — a taller fixture. A long linear, tiered or cascading design fills the vertical space that a wide, flat fixture leaves empty. If the ceiling is above roughly 10 ft, add 2–3 in to the hanging height for every extra foot so the fixture still reads as part of the room.

Clearance is not negotiable

Whatever the rule of thumb gives you, keep at least 7 ft (2.1 m) of clearance from the floor anywhere people walk, and higher still over a stairwell. Clearance takes priority over proportion every time.