How To Measure Case Fan Size

Case fans can be an essential element of your PC. However, in many cases, when you decide to purchase a new model of case fan that fits your computer, it could be a hassle with issues with accuracy. 

There are certain methods you need to follow to gauge the performance of your case fan.

How do you measure the size of a case fan? In brief the majority of cases, you’ll discover case fans that measure 120mm or 80mm, 92mm, 140mm, or 200mm. 

However, If you aren’t sure of the exact size of your fan, then you can gauge the size using a scale or measuring tape. 

However, measuring this size isn’t as easy as any typical measurement. To determine the size of the case fan, you need to master a few techniques. 

This article will help you get acquainted with these techniques.

Continue reading to learn more about the dimensions of case fans and the methods to gauge the dimensions of your case’s fans. Let’s get started!

How To Measure Case Fan Size
How To Measure Case Fan Size

How to Measure Case Fan?

Case fans are usually available in a specific size and these dimensions are identical in most countries. Most 120mm fans are found across the globe. 

If you’re not certain of your fan’s size in the case and would like to know the dimensions of the case’s fan, we can assist you in this regard.

  • To measure the fan in the case, you’ll require a measuring tape. It is possible to use a different scale. Nothing else is required to measure the fan of your case. Let’s begin the procedure.
  • Then, pull the case fan and place it on the table.
  • Take the measuring tape, and then measure the case fan to determine the size. However, not across the fan diagonally. Therefore, it is necessary to take measurements of the four faces of the fan case.

This technique can be utilized to determine the size of your case fan. If you can’t access an air conditioner and want to know the size of the fan case you’ll need, or you’d like to gauge the fan’s performance by measuring it in the case, there’s an option to assist you in this phase. 

It’s as simple as:

It is necessary to open the case and look for every angle’s holes. There are four holes at each angle.

Measure the center of one hole and the center of another. However, not diagonally.

In this way, you’ll be able to know what size of fan you’ll require. For instance, if you discover a measurement of 105mm from one hole to another one of the cases, you’ll require a fan of 120mm. 

You can also determine the size of the fan using this method since you can take measurements of the fan using the case during this process.

Why Do You Need To Measure On The Case Fan?

Case fans are among the most crucial components that your PC has. The case fan helps to balance the laptop’s temperatures by increasing the flow of air inside the case and thus bringing the temperature inside the case closer to the outside temperature. But, of course, everything depends on the dimensions of the case fan.

Even though they run with the exact RPM, the larger ones will draw more air from them than the smaller ones. This is because the larger ones rotate more slowly, but that doesn’t mean that they are less efficient. 

They’re still able to be more powerful than smaller ones. Instead of pushing air with fewer spins, they can push more air. as a result, it provides less noise.

To get the best features, take a look at the fan in your case and select the one with the largest size. Another aspect to be kept in mind is that the majority of models are designed to accommodate 140 or 120mm fans. 

So, before purchasing and/or replacing your case fan, you should be aware of the size that the fan in your case is. Do not purchase a case fan without taking measurements of the size of the case fan.

Common Computer Case Fan Sizes

In modern PC cases, 120mm fans are the most well-known size because of their characteristics. Additionally, it is widely available in all regions. 

But, different case fans sizes are commonly found in modern PC cases. They are:

  • 200mm
  • 140mm (As as well-known as 120mm)
  • 92mm
  • 80mm

These are the dimensions of fans for cases that are also used inside a PC case. 

However, 120mm and 140mm are thought to be the most popular because they can push more air than smaller ones, with fewer turns, and have less noise. 

Although cases with 200mm diameter are the largest, it’s not very sought-after because they are more expensive than 120mm or 140mm case fans.

However, smaller ones like 80mm or 92mm aren’t as well-liked as larger case fans because they create more noise than larger case fans, and they don’t blow the same amount of air as larger case fans.

Things To Take Into Consideration When Measuring Your Case Fan

It is now clear that measuring the computer’s case fans is vital enough. Moreover, this measurement can simplify a lot of things. 

Additionally, you’ll be able to know whether the case fan is compatible with your PC or not. Finally, when you are done you will consider what aspects to consider when measuring the case fan. 

Certain aspects should be considered when taking measurements of the fan’s efficiency.

 They are:

  • When you measure the fan’s performance, you must consider whether the case fan works with your PC or not.
  • Many PC cases today cannot hold tiny fans for a case. You must therefore determine whether the fan case is large enough to fit into the case of your PC.
  • You must ensure that you are not measuring the fan of the case not directly.


All the steps should be clear if you’ve made it to this point. You now know how to measure the fan. Follow the steps carefully to obtain the ideal measurement for you. 

We also have shared some things to think about before measuring the fans in your case. While there are several fixed-sized fans for your case, you’ll need to determine which to pick This article can aid you. 

A small mismatch in the dimensions of the case fan could cause problems with adjustment to your system and cause the loss of money as well. 

Make sure you have your measuring tape and begin your work today! Best of luck with your work!

I am a computer science graduate, and I love to play games. As an offline and online marketplace seller of computer hardware, I have the opportunity to help people make informed decisions about what they can use for their needs.