Ceiling Fan Size Calculator

Pick blade span by room square footage. Up to 75 sq ft uses a 29 to 36 in planning band. From 76 to 144 sq ft, the calculator uses 36 to 44 in. From 145 to 225 sq ft, it uses 42 to 50 in. The larger bands are 50 to 54 in for 226 to 400 sq ft, 54 to 60 in for 401 to 625 sq ft, and 60 to 72 in above 625 sq ft. Treat every band as a starting point and verify the model's clearance and airflow data.

A listed fan's instructions and adopted electrical and building code control blade clearance. Many US installations use a minimum 7 ft blade clearance. The calculator's mount suggestion is planning only. Have a qualified electrician verify the outlet box, support, clearance, and local requirements.

Choose a listed downrod that keeps the blades at the height and clearances required by the fan manufacturer and local code. The calculator estimates a target near 8 ft above the floor, but motor housings and approved rod sizes vary. Do not blindly round up if that would reduce required clearance.

Compare published sound data when available and read reviews for motor hum, bearing noise, and control noise at low speed. Motor type alone does not guarantee a specific noise reduction. Confirm that the fan also provides the airflow and controls needed for the room.

Blade pitch is only one part of fan performance. The calculator does not model pitch, CFM, noise, motor efficiency, room layout, or control settings. Compare the manufacturer's published airflow and efficiency data at the speed you plan to use, then confirm clearances and mounting requirements for the installation.