Ceiling Fan Size Calculator
Find the right ceiling fan diameter for your room.
Enter room dimensions to get a fan size recommendation for optimal airflow.
Recommended Fan Size
How Ceiling Fan Size Is Calculated
Ceiling fan blade span should match room size to move enough air without overwhelming the space. Undersized fans run constantly without cooling; oversized fans create uncomfortable drafts.
Fan Size Selection Formula:
Room Area (m²) = Length × Width
Then match to blade span:
| Room Area | Recommended Blade Span |
|---|---|
| Up to 7 m² | 76–91 cm (30–36 in) |
| 7–14 m² | 107 cm (42 in) |
| 14–25 m² | 122–132 cm (48–52 in) |
| 25–40 m² | 137–152 cm (54–60 in) |
| Over 40 m² | Multiple fans or 183 cm (72 in) |
Worked Example: Living room: 5m × 4.5m = 22.5 m² → Recommended fan: 122–132 cm (48–52 inch) blade span
Ceiling Height Considerations:
- Standard ceiling (2.4–2.7m): standard fan mount
- Low ceiling (under 2.4m): use a flush-mount (hugger) fan
- High ceiling (over 3m): use a downrod extension to lower fan to 7–9 feet above floor
- Minimum clearance from blade tip to wall: 45 cm (18 inches)
- Minimum clearance from blade to floor: 2.1m (7 feet)
CFM (Airflow) Reference:
- 76 cm fan: ~1,500–2,500 CFM
- 107 cm fan: ~3,000–4,500 CFM
- 132 cm fan: ~4,500–6,500 CFM
- 152 cm fan: ~6,000–9,000 CFM
Higher CFM means more air movement. Look for Energy Star rated fans — they move 75% more air per watt than standard fans.