Ceiling Fan Size Calculator – What Blade Span Do I Need? | CalcLoft
Find out the right ceiling fan blade span for any room.
What size ceiling fan do I need?
Match the blade span to the room's square footage:
| Room size | Blade span |
|---|---|
| Up to 75 sq ft | 29-36 inches |
| 76-144 sq ft | 36-42 inches |
| 144-225 sq ft | 44 inches |
| 225-400 sq ft | 50-54 inches |
| 400+ sq ft | 56+ inches or two fans |
Room size guide
- Bedroom (12×12): 144 sq ft → 42-44 inch
- Living room (15×12): 180 sq ft → 44 inch
- Great room (20×15): 300 sq ft → 54 inch
Mounting notes
- Blades should be 7-9 ft above the floor
- 9 ft ceiling: use a 3-6 in downrod; 10-12 ft: longer downrod
- Sloped ceilings need an angled mount adapter
Ceiling fan calculator FAQ
What size fan for a 12x12 bedroom?
144 sq ft needs a 42-44 inch blade span.
Is a bigger fan always better?
No — an oversized fan in a small room creates too much air movement and noise. Match the room.
Do fans help in winter?
Yes — run clockwise on low to push warm air down from the ceiling.
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