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What Size Ceiling Fan Do You Need?

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate the right ceiling fan diameter and CFM for your room size. Avoid buying one that is too small.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

Ceiling Fan Sizing Guide
Fan Height and Mount Type

Guia

< 7 m²: 76-91 cm. 7-13: 91-107. 13-21: 112-132. > 21: 132+ ou dois. No Brasil, ventiladores são essenciais — Ventisol, Arno e Spirit são as marcas favoritas. Grande em velocidade baixa = mais silencioso que pequeno em alta.

Economia

Permite subir AC em 3-5°C. Gasta R$3-8/mês vs R$100-300 do AC. Economia de 20-40% na conta de luz no verão.

⚡ CalcWolf Insight

The most energy-efficient cooling strategy: ceiling fan + thermostat raised 4°F. The fan costs 1/50th what the AC costs to run. A family using fans to raise their thermostat from 72°F to 76°F saves $200-400 per cooling season. Fans cool people, not rooms — turn them off when you leave.

Frequently asked questions

Qual para 16 m²?▾

132 cm. Ventisol e Spirit são bom custo-benefício.

Economiza?▾

Sim — 20-40% na conta de AC ao permitir temperatura mais alta.

✓ Math logic verified against primary sources → See our verification process

Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →