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Ceiling Fan Blade Span by Room Area Calculator

Recommended blade span (inches) by floor-area band.

Recommend a ceiling-fan blade span (sweep diameter) appropriate for a room's floor area, using ENERGY STAR / ASHRAE-style guidance: ≤75 sq ft → 32 in; 76-144 → 39 in; 145-225 → 47 in; 226-400 → 52 in; >400 → 60 in. Reports the recommendation in inches and centimetres.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

sq ft

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Piecewise lookup of recommended blade span by floor area.

In depth

Recommend a ceiling-fan blade span (sweep diameter) appropriate for a room's floor area, using ENERGY STAR / ASHRAE-style guidance: ≤75 sq ft → 32 in; 76-144 → 39 in; 145-225 → 47 in; 226-400 → 52 in; >400 → 60 in. Reports the recommendation in inches and centimetres.