Lighting & Ceiling Box Sizing · CEC Rule 12-3000

Chandelier Size & Weight Calculator

Calculate ideal fixture diameter, hanging clearance, and verify whether your ceiling electrical box requires heavy-duty support rating (>23 kg / 50 lbs).

1. Room & Fixture Dimensions

Room Length (Feet)

Room Width (Feet)

Ceiling Height (Feet)

Fixture Weight (Lbs)

2. Sizing & Electrical Box Code

CEC Ceiling Box Support

IDEAL CHANDELIER DIAMETER

26 Inches

MINIMUM HANGING CLEARANCE FROM FLOOR

7.0 Feet (84")

CEILING ELECTRICAL BOX REQUIREMENT

Standard Box (up to 50 lbs)

Standard Box OK: A standard outlet box supports fixtures up to 23 kg (50 lbs) per CEC Rule 12-3000.

CEC Rule 12-3000 Ceiling Support Standards

Fixtures over 23 kg (50 lbs) MUST NOT be supported solely by a standard plastic or octagon outlet box; they require a fan/heavy-duty rated box braced directly to framing.
Fixtures over 35 kg (77 lbs) must be supported independently of the outlet box directly to ceiling joists.
Over dining tables, position bottom of chandelier 30 to 36 inches above table surface.

Sizing rules of thumb

Two classic proportions that always look right.

Setting	Rule	Example
Open room	Diameter (in) ≈ room width (ft) × 2	12 ft wide room → ~24 in fixture
Over a dining table	Diameter ≈ half the table width	42 in table → ~21 in fixture
Hanging height (table)	30–36 in above the tabletop	8 ft ceiling → 33 in
Hanging height (floor)	≥ 7 ft clearance below	walkways and foyers

Add 3 in of diameter for each foot over 8 ft ceilings for taller rooms.

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