How to Measure a Ceiling Fan

How to Measure a Ceiling Fan

When you purchase a ceiling fan, you will find several sizes from 30″ to 70″, and even you will find larger sizes that usually are not used for home. You have to choose wisely a ceiling fan that will fit in your space and also complement the décor of your room.

If you already have a ceiling fan and you are going to update it, you need to measure fan blades. The measuring method might be slightly different depending on the number of blades. Typically, it is measured from tip to tip of two opposite blades.

In this post, you will learn how to measure your room size, ceiling height and finally, how to choose the right sizes of fans.

Let’s take a look.

How to measure a ceiling fan?

Two things you must consider when you are picking a ceiling fan: one is blade sweep, and the other is the length of the downrod.

When considering the size of your room, the blade sweep measurement is very important. For larger living rooms or grand rooms, larger ceiling fans are required. A smaller ceiling fan, on the other hand, is better suited to kitchens or small bedrooms.

Blade sweep is a calculation of blade span. Blade span is the measurement of fan blades diameter when it is rotating. It is very easy to calculate. For an odd number of blades, measure from the centre of the fan to the tip of any blades. And for an even number of blades, measure from tip to tip of any two opposite blades.

Downrods are used for adjusting heights from the floor to the bottom of the fan. If your ceiling is very high, you need a longer downrod, and if your ceiling is low, you need a short downrod. Even you might need a low profile ceiling fan if your ceiling height is just 7 feet or below.

Step 1: Measure your room.

First, you need to determine the area of your room that help you to pick the right sizes of fans. Please measure the length and width and then multiply them. It mentions the square footage of your room.

For example, if your room length is 13 feet and wide is 12 feet, the area is 13 x 12 = 156 sq. ft.

Step 2: Recommended fan size.

American Lighting Association published a guideline for selecting fan sizes for different spaces.

If you have a 75 sq. ft. room or less, a 36 inches fan is recommended.

Your fan should have a diameter of between 36 to 42 inches for rooms between 75 and 144 square feet.

If you have a large room like 225 sq. ft. or above, you can pick a 48 to 56 inches fan.

Step 3: Measure the height of the room.

You should install a fan high enough to prevent anyone from hitting it. Larger ceiling fans tend to be larger so that when picking what size a ceiling fan you want to install, you need to keep their drop in mind.

The ALA recommended, at least 7 feet clear should have from the floor to the bottom of the fan. This means you shouldn’t install a ceiling fan in a low-ceiling. But you can install a hugger ceiling fan for a low ceiling.

Most of the manufacturer offers one or two different sizes downrod with a new purchases ceiling fan. For a high ceiling of more than 8 feet, you might need a downrod.

Step 4: Consider if there are any obstacles.

Make sure there is no obstacle on the ceiling that blades could collide with. Also, notice around that fan mounted area if there is any lights or architectural something. You may have to downgrade the size of the ceiling fan if you notice something is wrong.

Step 5: Determine how you want to use the fan.

The purposes of uses a ceiling fan can vary from person to person. Someone wants a little air movement with air condition. On the contrary, some users might need plenty of air movement. The temperature might vary from one place to another.

If you need a lot of airflow, you also need a larger ceiling fan. Many ceiling fans come with a light fixture; in that case, you have to measure fan height from the ceiling to the bottom of the light fixture. This means that a ceiling fan with light requires an even higher ceiling than one without.

Step 6: Consider looking.

This is another factor you need to consider during picking a fan. If you think a bigger fan will not look good in your space or small size is not perfect, you can pick a higher or lower sizes fan. Also, try to choose a fan that matches your home décor.

Step 7: Safety hook up.

Once you’ve decided on the size of fan you want, please double-check that you have enough ceiling support to handle its weight and movement. If you think your support is not so strong, try to avoid a bigger fan. Or make strong ceiling support.


Before purchasing a ceiling fan, there are a lot of considerations. Make sure the fan is providing all advanced features like wireless compatibly, easy operating. Also, make sure the fan comes with a LED light fixture with a dimmable feature. I hope this article helps you to choose the correct sizes fan that actually you need.

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