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Ceiling Fan Size Calculator: ENERGY STAR Chart

Look up a suggested ceiling-fan blade span from the ENERGY STAR room-area chart, which cites the American Lighting Association, 2003. Exactly 144 square feet uses the 36–42 inch row. Above 400 square feet the published chart has no size, and this page does not invent one.

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Your estimate

Suggested blade span

44 in

From the ENERGY STAR room-size chart.

Room area

168 sq ft

Sizes are from the ENERGY STAR Ceiling Fan Basics chart, citing the American Lighting Association, 2003: up to 75 sq ft → 29–36 in; 76–144 sq ft → 36–42 in; 144–225 sq ft → 44 in; 225–400 sq ft → 50–54 in. This page puts exactly 144 sq ft in the 36–42 in row. Mount at least 7 ft above the floor (8–9 ft is optimal) and 18 in from walls. Above 400 sq ft the published chart has no size.

Estimates only — confirm with your supplier and local code. First published · Last reviewed by CalcTheJob.

How to use the ceiling fan size calculator

  1. Enter the room length and width. Area is their product.
  2. Read the suggested blade span from the ENERGY STAR chart.

ENERGY STAR also says to mount the fan at least 7 feet above the floor (8–9 feet is optimal) and 18 inches from the walls. Recessed-light pricing is on the recessed lighting cost calculator.

ENERGY STAR / ALA 2003 chart

Up to 75 sq ft → 29–36 in; 76–144 sq ft → 36–42 in; 144–225 sq ft → 44 in; 225–400 sq ft → 50–54 in. The published chart lists 144 sq ft on two rows; this page puts exactly 144 in the 76–144 row (36–42 in). Rooms larger than 400 sq ft are flagged; no larger size is invented.

Worked examples

A 12 × 14 ft room is 168 sq ft, which is a 44 in fan. A 12 × 12 ft room is exactly 144 sq ft and uses the 36–42 in row. A 20 × 21 ft room is 420 sq ft, which is over the chart.

Sources & assumptions

How this calculator gets its numbers. Full method: our methodology.

  • Suggested blade span follows the ENERGY STAR Ceiling Fan Basics chart, citing the American Lighting Association, 2003: up to 75 sq ft → 29–36 in; 76–144 sq ft → 36–42 in; 144–225 sq ft → 44 in; 225–400 sq ft → 50–54 in.
  • The published chart lists 144 sq ft on two rows; this page puts exactly 144 in the 76–144 row (36–42 in). Above 400 sq ft the chart has no size, and this page does not invent one.
  • Mounting guidance is also from that ENERGY STAR page: at least 7 ft above the floor, 8–9 ft optimal, and 18 in from walls.

Sources

  1. ENERGY STAR / U.S. EPA, Ceiling Fan Basics. Room-area to blade-span chart, reference American Lighting Association, 2003. Also states the 7 ft minimum / 8–9 ft optimal mounting height and 18 in wall clearance.

Last reviewed . The ENERGY STAR chart and the manufacturer’s installation instructions win.

Frequently asked questions

What size ceiling fan for a 12×14 room?

168 sq ft is in the ENERGY STAR 144–225 sq ft row, so 44 inches.

What size for exactly 144 square feet?

36–42 inches. The chart lists 144 on two rows; this page puts the exact 144 in the smaller row.

What if my room is larger than 400 square feet?

The ENERGY STAR chart stops at 400 sq ft. This page says so and does not invent a larger size.

How high should a ceiling fan be mounted?

ENERGY STAR: at least 7 feet above the floor, 8–9 feet optimal, and 18 inches from the walls.

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