Work out ceiling fan size for room instantly with clear inputs, formula shown and shareable results.
Fan diameter follows room area: about 90-105 cm for a small bedroom, 120-132 cm for a living room, and larger for open-plan spaces. Blades should sit around 2.4 m above the floor and at least 45 cm from any wall, which is what sets the downrod length.
Fan sizing
diameter from room area band, adjusted for climate; downrod = (ceiling height - 2.4 m) - fan body height
Too low is a hazard and too high loses the cooling breeze. Around 2.4 m gives the best airflow at head height in a standard room.
In a long or open-plan room, yes. Airflow coverage is roughly circular, so two fans cover an elongated space far more evenly.