Ceiling Fan Size Calculator

Ceiling Fan Size Calculator

Find the right ceiling fan blade span for your room size, plus the downrod length for your ceiling height.

Guideline based on standard sizing charts. Fan blades should sit at least 18 in from walls and 7 ft above the floor; for sloped or high ceilings use a longer downrod. For damp/wet locations choose a damp- or wet-rated fan.
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What size ceiling fan do I need?

Match blade span to room area: up to 75 sq ft → 29–36 in; 76–144 sq ft → 36–44 in; 145–225 sq ft → 44–52 in; 225–400 sq ft → 52–56 in. Large great rooms may need a 56 in+ fan or two fans. Keep blades 7 ft above the floor and 18 in from walls.

Room size Blade span
Up to 75 sq ft 29-36 in
76-144 sq ft 36-44 in
145-225 sq ft 44-52 in
225-400 sq ft 52-56 in