Ceiling Fan Size For Room Calculator

Work out ceiling fan size for room instantly with clear inputs, formula shown and shareable results.

About Ceiling Fan Size For Room Calculator

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.

Formula

Fan sizing

diameter from room area band, adjusted for climate; downrod = (ceiling height - 2.4 m) - fan body height

Worked example

With the default values below, Ceiling Fan Size For Room Calculator returns Recommended fan diameter of 120. Change any input above and every figure here is recalculated in your browser.

Inputs used

Room length: 4.5 m
Room width: 3.6 m
Ceiling height: 2.6 m
Climateone of Temperate, Warm, Hot and humid: Warm

Results

Recommended fan diameter: 120 cm
Room area: 16.20 m²
Downrod length: 8 cm
Airflow required: 113 m³/min

Step by step

1Values used
2Fan sizing
3Recommended fan diameter= 120 cm
4Room area= 16.20 m²
5Downrod length= 8 cm
6Airflow required= 113 m³/min

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does blade height matter?

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.

Do two small fans beat one large one?

In a long or open-plan room, yes. Airflow coverage is roughly circular, so two fans cover an elongated space far more evenly.