How to measure ceiling fans. How to measure 5 blade ceiling fans.

Ceiling fans come in a variety of sizes, and it can be tricky to know which size fan you need for your room.

How to measure ceiling fans?
How to measure ceiling fans?

A lot of people end up buying the wrong size ceiling fan because they don’t know how to measure correctly. This can lead to poor performance and increased energy bills.

In this post, Toby Nwazor from will show you how to measure ceiling fans? How to measure 5 blade ceiling fans? We’ll show you how to measure the height, width, and blade span of your room so that you can buy the perfect fan for your needs.

How to measure ceiling fans

Step 1: Take a measurement of the room’s square footage

Take a measurement of the room's square footage
Take a measurement of the room’s square footage

How do you measure a ceiling fan size? When it comes to installing a ceiling fan, size is very important. For example, ceiling fans with blades that are 29 to 36 inches in diameter are best suited for compact areas such as home offices and utility rooms that are less than 75 square feet in size. Ceiling fans with 50 inches or more in diameter are required to properly cool most large-sized bedrooms, basements, and living rooms.

  • Determine the length of the room (in feet) by measuring from one wall to the opposite parallel wall.
  • The width of the room can be determined in a similar manner.
  • The area of a room is calculated by multiplying the length by the width you have found. for example, a room measuring 15 feet by 10 feet has a floor area of 150 square feet.

Step 2: Measuring diameter of a ceiling fan

Measuring diameter of a ceiling fan
Measuring diameter of a ceiling fan
  • Switch off the electricity before measuring.
  • If necessary, a step ladder should be used.
  • The first step is to measure the distance across the blades of the fan, typically referred to as the “span”. To do this, simply hold a tape measure up to each blade individually and record how far they span across.
  • You will need to determine how many inches there are between each blade and average these measurements together. This number will be used later on when calculating how much air your fan can actually move in one minute, which is called its “CFM” rating.

Once you have this measurement for the blade span, you can then use an online calculator or another resource to calculate your CF.

To understand more about blade span :

Blade Span: Along the blade span there is a significant variation in the blade-pitch angle β, which is strongly linked to the value of J and to a lesser extent to the values of the lift coefficient CL and the blade chord l.


Step 3: Measuring the height of the ceiling

Measuring the height of the ceiling
Measuring the height of the ceiling
  • The general rule of thumb when measuring for a ceiling fan is that the fan should hang at least 7 feet above the floor, but no lower than 8 feet. This gives you plenty of clearance to walk underneath without having to duck, while still providing enough airflow to cool the room effectively.
  • To measure your ceiling height, use a tape measure or yardstick to get an accurate measurement from floor to ceiling. Keep in mind any obstacles like furniture or doorways that might be in the way and factor them into your measurement.

Step 4: Calculating the length of the downrod

  • A ceiling fan downrod is the piece of hardware that links the mounting bracket to the fan body (also known as the motor housing) in order to boost stability, minimize the chance of wobbling, and guarantee that the fan is installed at the optimum hanging height for optimal performance. You’ll need to think about how low the fan should be installed in order to maintain an appropriate distance between the ceiling and the fan blades while also providing adequate clearance space between the blades and the tops of people’s heads, among other things. Your ceiling fan blades should have at least eight inches of clearance from the ceiling for proper air circulation, and for maximum safety, your ceiling fan should be suspended at least seven feet above the floor.
  • When measuring the length of a ceiling fan downrod, it is important to use a tape measure that is long enough to reach from the top of your ceiling to the bottom of the fan. Some fans require longer downrods than others, so you will need to be sure that you have an accurate measurement in order to get a properly-sized downrod for your fan.
  • Another key step when measuring a ceiling fan downrod is carefully reading the product specifications or instructions that came with your fan. This information will typically include important details about how far each blade should hang below your ceiling, as well as how far the safety cable should extend beyond each blade. Depending on how high your ceilings are, these measurements can vary and having this.

How to measure ceiling fan scale?

So how to measure a ceiling fan for a room? When it comes to installing a new ceiling fan, many homeowners are unsure of how to properly size the fan for their home. This is especially true if the fan is being installed in a newly constructed home, as the builder may have installed a smaller fan without properly measuring.

Here’s a guide on how to measure a ceiling fan scale and determine the appropriate fan size for your home.

Room Size (In Sq. Feet) Room Type Recommended Blade Span Recommended CFM Rating
Under 144 Bathroom, Breakfast Nooks, Utility Rooms, Small Bedrooms, Porches Under 42″ Fans 1,000-3,000
144-225 Medium Bedrooms, Kitchens, Dining Rooms, Dens, Patios 44-50″ Fans 1,600-4,500
225-400 Master Bedrooms, Family Rooms, TV Rooms, Small Garages, Gazebos Fans Over 50” 2,300-6,500
Over 400 Great Rooms, Large Garages, Basements, and Open Floor Plans Fans Over 62” 5,500-13,500

Additional considerations for the size of a ceiling fan

Additional considerations for the size of a ceiling fan
Additional considerations for the size of a ceiling fan
  • How high the ceiling is, how far down you want the blades to hang, how much clearance is needed under the blades (for example, if you’re hanging the fan over a bed), and how steeply  angled your ceiling is.
  • For instance, we’ll assume that you have an 8-foot ceiling, you want the blades to hang 3 feet below the ceiling, you need at least 2 feet of clearance under the blades, and your ceiling isn’t angled.
  • You’ll need a few things for this measurement: A tape measure, A level, A helper (optional).

To be more sure, Toby Nwazor recommends reading the article, how many watts used by ceiling fans and how ceiling fans work

How to measure 5 blade ceiling fans?

How to measure 5 blade ceiling fans?
How to measure 5 blade ceiling fans?

So how to measure ceiling fans size? If the unit contains an odd number of ceiling fan blades, such as a five-blade fan, the radius is calculated by measuring from the tip of one blade to the center of the fan. The diameter is calculated by multiplying the quantity by two.

In addition to measuring ceiling fans, you should refer to which way should ceiling fans turn to install in harmony with your room.

F.A.Q How to measure ceiling fans

What is the length of the blades on a 42-inch ceiling fan?

Expert Assistance Reply: I measured the AirrForce 42″ Hugger Style RV Ceiling Fan # 277-000398 Replacement Blades for you and they are 16- 5/8 inches long, 4 inches wide at the bottom, and 4-7/8 inches wide at the top.

How large are the blades on a 52-inch ceiling fan?

There is no exact measurement for the length of the blades on a 52-inch ceiling fan. It changes according to the size of the fan’s core. A 22-inch blade will fit in most circumstances. However, it is possible that your specific model will range from 20 to 25 inches.

Is a 52-inch ceiling fan too large?

Large ceiling fans between 52 and 56 inches in diameter perform effectively in rooms ranging from 175 to 350 square feet. Large living rooms, cathedral-ceiling rooms, or any room with a high ceiling are examples of such areas.

Is a 52-inch ceiling fan excessively large for a bedroom?

Can a 52 “Can a Fan Be Used in a Bedroom? Yes, a 52 “can fit in a bedroom if the room size rules are followed For this size fan, the bedroom should be at least 12’x 14′ or greater, with a floor clearance of at least 7′. You can learn about best ceiling fans for bedroom at our website.


Ceiling fans are a great way to keep your home comfortable all year round. By understanding the different factors that go into choosing the right ceiling fan for your needs, you can be sure to select the best one for your space.

We hope this article has helped you measure and understand ceiling fans better so that you can make an informed purchase. Have questions about how to choose or install a ceiling fan? Leave us a comment and we’ll be happy to help.

Toby Nwazor

Toby Nwazor is a serial entrepreneur, a success coach, a business development consultant, a strategist, a motivational speaker, and a freelance writer. He writes on other cool platforms like Entrepreneur magazine,, Good Men Project, and Business 2 Community and author of website articles . He is the founder of My Startup CEO where he gives kick-ass motivation and provides helpful tips for start-up business success. Follow him on Twitter, and Like MSC on Facebook

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