Ceiling Fan Size Calculator
Fan sweep (mm) and count for a room, plus the airflow you should expect.
A fan cools people, not rooms — 2–3 °C of perceived relief at ~0.05 kW. BLDC models halve even that. Blades belong 2.1–2.4 m above the floor.
Formula
Ceiling Fan Size Calculator is a free ceiling fan size for HVAC designers, technicians and energy auditors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Ceiling Fan Size Calculator
Fan sweep (mm) and count for a room, plus the airflow you should expect. The calculation implements ≤7 m²: 900 · 7–12: 1200 · 12–16: 1400 mm · beyond: multiple fans (IS 374; ECBC fan guidance). A fan cools people, not rooms — 2–3 °C of perceived relief at ~0.05 kW. BLDC models halve even that. Blades belong 2.1–2.4 m above the floor.
How to use Ceiling Fan Size Calculator
- 1Enter Room length in m.
- 2Enter Room width in m.
- 3Read Room area, Recommended sweep, Fans needed instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Ceiling Fan Size Calculator?
- ✓Implements the standard formula — ≤7 m²: 900 · 7–12: 1200 · 12–16: 1400 mm · beyond: multiple fans
- ✓Reference cited on-page: IS 374; ECBC fan guidance
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Ceiling Fan Size Calculator use?+
It computes ≤7 m²: 900 · 7–12: 1200 · 12–16: 1400 mm · beyond: multiple fans, per IS 374; ECBC fan guidance. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
A fan cools people, not rooms — 2–3 °C of perceived relief at ~0.05 kW. BLDC models halve even that. Blades belong 2.1–2.4 m above the floor.
Is this based on ASHRAE methods?+
The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.
Is the Ceiling Fan Size Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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