Ceiling Fan Size Calculator
Blade span and CFM for a room.
Enter your values
ⓘ Live results
Results
- Recommended blade span
- 52 in
- Target airflow
- 6,000 CFM
- Room area
- 168 sq ft
- Downrod length
- 24 in
- Blade height above floor
- 8-9 ft ideal
Quick answer
Ceiling fan blade span is chosen by room size, from 42 inches for small rooms up to 60+ inches for large spaces.
span by room area; downrod = ceiling height - 8 ft
How to use the Ceiling Fan Size Calculator
- 1Measure the room's length, width and ceiling height.
- 2Pick a fan at or near the recommended span with the listed CFM.
- 3Use a downrod so blades sit 8-9 feet above the floor.
Worked example
Using the values the calculator loads with:
Inputs
- Room length14 ft
- Room width12 ft
- Ceiling height10 ft
Results
- Recommended blade span52 in
- Target airflow6,000 CFM
- Room area168 sq ft
- Downrod length24 in
- Blade height above floor8-9 ft ideal
Frequently asked questions
Two fans or one?
Rooms longer than about 20 feet feel far better with two smaller fans.
Winter direction?
Reverse to clockwise on low to push warm ceiling air down the walls.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.