How Do I Know if a Motherboard Will Fit in My Case in 2022

When choosing a motherboard, it is important to consider the case you will be using since not all motherboards will fit in every case.

Different cases have different shapes and sizes, so it is important to find one that will fit your needs.

The good news is that most cases are designed to accommodate standard motherboards.

However, there are a few things you can do to ensure that the motherboard you choose will fit in your case.

Two of the crucial components when building a computer is a motherboard and the PC case.

When you are going to be upgrading your computer by buying a new motherboard, it’s important for you to know whether or not the motherboard will fit into your case before you buy it.

To do this, you must check the motherboard dimensions and form factor against the size of the case that you have.

How to know if Your Case is Compatible With Your Motherboard

PC Case

Well, the easiest way to tell if a motherboard will perfectly fit inside your case is by measuring the outside dimensions of your case with the motherboard’s outer edge.

If the measurement of the outside of your case is equal to or less than the measurement of the inside of your case, then the board will not only fit but also have an inch or so of space for heat dissipation.

But there is another solution that includes simply checking the motherboard form factor, which is listed right on the manufacturer’s website.

For example, the ASUS ROG Strix B450-F Gaming is an ATX motherboard; this means the case you need must support the ATX form factor.

The supported motherboard format is one of the primary specs listed by the PC case manufacturer, so be sure to check the website for specifications.

The Motherboard Form Factor And Computer Case

Motherboard Form Factor

The form factor is the size and shape of the motherboard. Although form factors are standardized for a particular type of Motherboard, not all cases are compatible with every type of motherboard

So, before choosing a motherboard make sure that it will fit in your case. The common factors are ATX (or eATX), ATX, micro-ATX, and mini-ITX Motherboard.

The form factor is one of the most important specifications of the motherboard and will tell you whether it will fit into your case or not.


Let’s begin by explaining all the different form factors. The most common form factor is the ATX which usually measures 12 by 9.6 inches (305mm x 244mm).

ATX motherboards fit in almost the majority of the cases and are used to build gaming machines or powerful workstations.


Micro-ATX is a less popular format than ATX. It is used mostly for compact desktop PCs. Micro-ATX has a smaller motherboard size measuring 9.6 by 9.6 inches (244 × 244 mm); however, the length may vary.

It is commonly used for budget-oriented PCs, Linux servers, or HTPCs (Home Theater PC).

Note that even though it is a smaller motherboard, the connectivity options are usually the same as standard ATX motherboards.


Mini-ITX is another format that is usually used by budget PC builders and is not that common.

Mini-ITX motherboards are the smallest in size and measure 6.7 × 6.7 inches (170 × 170 mm). They are useful when it comes to creating desktop computers in RVs or other small spaces.

Let’s say you have an ATX motherboard and your case only supports micro-ATX or mini-ITX form factors.

In this case, your motherboard will not fit in your case. You need to decide if you want to buy a different case or a different motherboard.

Hence, you should always first choose the major components of your computer (the motherboard, processor, and hard drive) and then purchase the case to go with those components, not the other way around.

For example, if you’re going to build a gaming machine, you should first pick an ATX motherboard, and then buy the case to go with it.

But what about those times when you are not sure what form factor a case is?

In such a case, you should check with the manufacturer of your case. Chances are, they will have a chart that tells you what motherboard size you can use in their case or would provide a list of motherboard form factors supported by the enclosure.

Usually, all full towers can support standard motherboard sizes, and mid towers can support micro-ATX and smaller motherboards.


The motherboard form factor is a standard that specifies the physical size of the motherboard and whether it can be fixed into a case.

However, this shouldn’t confuse you as long as you know the dimensions and the supported form factor of the enclosure.

Also, most motherboards are made to fit in full or mid-tower cases, which is why there is no reason to be worried when selecting a motherboard and case for your computer.

It is highly likely that it will be 100% compatible, but to be sure, don’t forget to check the dimension of your case to see if it can support your motherboard.

By now I hope you have the answer to “How do I know if a motherboard will fit in my case” if there is anything you need to add or ask, feel free to drop a comment.

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