Computer Case Sizes Explained

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Written by Tianshu Wei

Facts checked by Ronald Miller

 Written by people for people

I am Tianshu and I ♡ PC. I share my knowledge with other PC enthusiasts and provide useful info.

PC Case Sizes

When building a computer, the case size you choose is important. Think of it like picking the right-sized box for your stuff. There are big cases, medium ones, and small ones. Each size has its own benefits. Some let you add more parts, while others are compact and save space. This guide will help you figure out which case size is best for your needs.

Let’s dive in and learn more about these computer “boxes”!

PC Case Size Comparison Chart

Just like there are different sizes of boxes for packing, there are different sizes of cases for computers. Each one has its own special features. Let’s take a closer look at these different computer case sizes and see what makes each one unique.

PC Case SizeMotherboards Supported5.25″ Drive Bays3.5″ Drive Bays2.5″ Drive BaysExpansion SlotsGraphics CardsCase Fans
SFFMini-ITX11 to 30 to 4211 to 3
Mini TowerMini-ITX, MicroATX1 to 24 to 60 to 441 to 22 to 4
Mid TowerMini-ITX, MicroATX, ATX2 to 56 to 80 to 107 to 82 to 33 to 9
Full TowerMini-ITX, MicroATX, ATX, EATX3 to 66 to 130 to 117 to 103 to 45 to 10

Detailed Computer Case Size Comparison

The PC case is the foundation that determines the type and number of components you can fit, the cooling capabilities, and the overall aesthetics of your setup. While there isn’t a strict standardization for computer case sizes, there are general categories that most cases fall into.

A well-chosen case ensures optimal cooling, preventing overheating of sensitive components like graphics cards and hard drives. Moreover, the size of the case dictates the type of motherboard it can accommodate, which in turn affects the number of RAM slots, PCIe slots, and storage expansion ports available. 

There are four primary computer case sizes:

  1. Full Tower
  2. Mid Tower
  3. Mini Tower
  4. Small Form Factor (SFF)

Each size has its unique characteristics, advantages, and limitations. Here’s a detailed comparison to help you make an informed decision:

1. Small Form Factor (Mini-ITX Case)

Small Form Factor (Mini-ITX Case)

The phrase “less is more” has never been truer. The Small Form Factor (SFF) is a testament to this, offering a compact yet powerful solution for those who value space, aesthetics, and functionality.

Once viewed as specialized, niche products, SFF cases have witnessed a renaissance in recent times. Their compact design, coupled with the ability to house potent hardware, has made them a favorite among many. From fitting seamlessly into home theater setups to serving as efficient workstations in space-constrained environments, the SFF’s versatility is undeniable.

Good Things About SFF

  • Portability: The primary allure of the SFF is its compactness. Easy to transport, these cases can be slipped into backpacks or briefcases, making them ideal for those on the move.
  • Space-Efficient: Perfect for tight spaces, be it a small office cubicle or a cozy apartment, the SFF ensures you don’t compromise on performance due to space constraints.
  • Aesthetically Pleasing: With a minimalist design, these cases can blend seamlessly into any environment, be it a professional setting or a modern living room.
  • Cooling Efficiency: Contrary to popular belief, many SFF cases come equipped with efficient cooling solutions, ensuring that the compact space doesn’t lead to overheating.

Not-So-Good Things

  • Limited Airflow: The compact nature can sometimes restrict airflow, leading to potential overheating issues, especially during intensive tasks.
  • Complex Assembly: Fitting components into a tight space can be challenging, especially for first-time builders. Proper planning and patience are crucial.
  • Limited Customization: Due to fixed component slots and limited space, customization options can be restricted in SFF cases.
  • Cost: Often, SFF-specific components can be pricier than their standard counterparts, potentially increasing the overall cost of the build.

Who’s It For?

The SFF shines in scenarios where portability and space are paramount. Whether it’s a console-themed gaming PC, a home theater setup, or an Esports rig, the SFF is up to the task. Its compact design doesn’t mean a compromise on power, making it a formidable choice for various applications.

2. Mini Tower (MicroATX Case)

Mini Tower (MicroATX Case)

The second size is Mini Tower, often referred to as the Micro-ATX tower, which has carved a niche for itself. It’s the Goldilocks of PC cases – not too big, not too small, but just right for a significant portion of PC builders. These cases, typically ranging between 10 to 14 inches in height and 4 to 8 inches in width, are designed with the intent of maximizing functionality within a compact space. They’re the embodiment of the saying, “good things come in small packages.

Good Things About Mini Tower

  • Budget-Friendly: Mini towers often come with a more affordable price tag, not just because of their size but also due to their compatibility with MicroATX motherboards, which are typically more budget-friendly.
  • Standard Component Compatibility: Unlike some of their smaller counterparts, mini towers can often accommodate standard-sized components, saving you from the often higher costs associated with specialized parts.
  • Flexible Placement: Their moderate size means they’re versatile in terms of placement. Whether you want it on your desk or tucked away on the floor, a mini tower can fit comfortably.
  • Space-Efficient: For those with limited desk space or those who prefer a minimalist setup, mini towers are a godsend. They offer a balance between size and functionality, ensuring you don’t have to compromise on power for the sake of space.

Not-So-Good Things

  • Limited Expansion: While they do offer more room than SFF cases, mini towers still have their limitations. Expansion slots might be fewer, and there’s a limit to how much you can pack inside.
  • Component Restrictions: Want that triple-fan GPU? It might be a tight fit. The same goes for some of the taller CPU coolers. You’ll need to choose components with the case size in mind.
  • Airflow Concerns: Due to their compact nature, airflow can sometimes be less than optimal, especially if you’re trying to pack in high-performance components.

Who’s It For?

The mini tower is for the discerning PC builder who values space efficiency without sacrificing too much on power. It’s for the office worker who needs a reliable machine that doesn’t dominate their desk. It’s for the student with limited space in their dorm room. It’s for the gamer who doesn’t need a multi-GPU setup but still wants a machine that packs a punch. In essence, it’s for anyone who values a balance between size, power, and budget.

3. Mid Tower (ATX Case)

Mid Tower (ATX Case)

Mid-tower cases, often considered the “Goldilocks” of computer cases, have long been the preferred choice for many PC enthusiasts. Their dimensions typically range between 16 to 18 inches in height and 7 to 9 inches in width. These cases are designed to accommodate standard ATX motherboards, offering a harmonious blend of size and functionality. With the ability to house powerful components like high-end graphics cards and beefy CPU coolers, mid-towers strike a balance between the compactness of mini-towers and the expansive nature of full-towers. They also come equipped with adequate cooling solutions, including the capacity to fit up to 200mm radiator fans.

Good Things About Mid Tower:

  • Versatility: Mid-towers are suitable for a wide range of applications, from gaming rigs to content creation stations.
  • Compact Yet Spacious: While they maintain a relatively compact footprint, they don’t skimp on space, offering ample room for high-performance components.
  • Cooling Efficiency: With multiple fan mounts and vents, they ensure optimal airflow, keeping components cool during intensive tasks.
  • Cost-Effective: They offer a budget-friendly solution for those wanting to house powerful components without breaking the bank.

Not-So-Good Things:

  • Generic Appeal: Due to their popularity, building a unique PC rig with a mid-tower can be challenging as many designs have been explored.
  • Size Constraints: While they are more spacious than mini-towers, they don’t offer the same level of expandability as full-towers.
  • Potential for Overcrowding: If not managed properly, the interior can become cluttered, especially when housing multiple high-end components.

Who’s It For?

The mid-tower case is the ideal choice for both amateur and seasoned PC builders. Its versatility makes it suitable for a variety of applications, from gaming to professional work. Whether you’re a first-time builder looking for a hassle-free experience or a veteran wanting a balance between size and functionality, the mid-tower case is a reliable and popular choice. It caters to those who desire a blend of performance, aesthetics, and value.

4. Full Tower (EATX Case)

Full Tower (EATX Case)

Full towers are the behemoths of the PC case world, designed for those who demand the utmost in expandability and versatility. With dimensions typically ranging between 20 to 24 inches in height and 8 to 10 inches in width, these cases are built to accommodate even the most ambitious of PC builds. Whether you’re a server admin, a hardcore gamer, or an overclocking enthusiast, full towers offer the space and flexibility to house high-performance components, multiple storage drives, and advanced cooling solutions. From dual-CPU setups to intricate custom water-cooling loops, full towers provide the canvas for PC enthusiasts to bring their most audacious visions to life.

Good Things About Full Tower:

  • Ultimate Expandability: With their generous size, full towers can accommodate a wide variety of motherboards, including E-ATX and sometimes even XL-ATX.
  • Cooling Potential: These cases are designed for optimal airflow, with ample space for large radiator fans, water cooling kits, and other advanced cooling solutions.
  • Versatile Builds: Whether you’re crafting a high-end gaming rig, a powerful workstation, or a server, full towers offer the space and flexibility to meet diverse needs.
  • Storage Galore: With numerous drive bays and expansion slots, these cases are ideal for builds that require extensive storage solutions.

Not-So-Good Things:

  • Bulky Size: Their impressive size can also be a drawback, making them challenging to manage and move.
  • Potential Overkill: For many standard builds, a full tower might offer more space than necessary, leading to unused and empty sections within the case.
  • Higher Costs: Given their size and features, full towers tend to be more expensive than their smaller counterparts.

Who’s It For?

Full towers cater to a specific audience that values performance, expandability, and customization above all else. They’re the go-to choice for professional content creators requiring high-end hardware for tasks like video rendering or 3D graphics work. Gamers seeking to push the boundaries of their rigs, with multiple graphics cards and advanced cooling solutions, will also find full towers to be a perfect fit.

Additionally, server admins and those building powerful workstations will appreciate the ample storage options and cooling efficiency that these cases offer. In essence, if you’re someone who refuses to compromise on performance and seeks the space to bring your most ambitious PC visions to life, a full tower is the case for you.

What PC Case Size Should You Get?

Selecting the right PC case size is a balance of space, purpose, specs, portability, and budget. Whether you’re building a compact streaming machine or a gaming powerhouse, there’s a case out there that’s perfect for your needs. Here’s a breakdown of factors to consider:

1. Your Available Space

The Space You Have:

We can’t stress enough how crucial it is to consider the space you have. If you’re working with a compact desk or planning to tuck your PC into a tight spot, smaller cases like the mini-tower or small form factor (SFF) are your best bet. They’re not just space-savers; many of these compact cases are designed with elegance in mind, making them perfect for minimalistic setups.

The Space You Need:

However, if you’re not constrained by space and have grand visions for your PC build, larger cases like the mid or full tower might be more up your alley. These cases offer more room for expansion, cooling solutions, and intricate builds.

2. Your Primary Purpose

For the Gamers:

If your heart is set on a gaming rig that can handle the latest titles at max settings, then you’ll need a case that can accommodate high-end components. While a mid-tower can often suffice, a full tower provides the space and cooling efficiency that hardcore gamers might need. Some cases are even tailored for gaming, offering features like RGB lighting and tempered glass panels.

For the Professionals:

Building a server or workstation? A full tower is almost non-negotiable. These cases can house multiple hard drives, extensive RAM setups, and even dual processors. Plus, the added space ensures that your components won’t overheat during those intensive tasks.

For the Casual Users:

If you’re just looking for a machine for everyday tasks, streaming, or light gaming, then a mini-tower or SFF case should do the trick. They’re compact, often more affordable, and provide ample space for standard builds.

3. Your Chosen Specifications

High-End Specs:

Dreaming of a top-tier PC with the latest RTX series GPU? You’ll need a case that can fit these larger components. While some mini-towers and SFF cases are designed to accommodate high-end parts, it often requires careful planning and might limit future upgrades.

Standard Builds:

For those running standard setups, a mid-tower is often the sweet spot. It provides a balance between space, expandability, and cost.

4. Your Portability Requirements

On-the-Go:

If you’re a digital nomad or frequently move between workspaces, consider an SFF case. They’re compact and lightweight, and some even come with handles for easy transport. However, remember that their smaller size might limit upgrade options down the line.

Stationary Setups:

For those who plan to set up their PC and leave it be, any case size will do. It all boils down to your space, purpose, and specifications.

5. Your Budget

While it might be tempting to splurge on a flashy case, remember that the internal components are where you should invest most of your budget. Mini-tower cases often offer the best value for money, but if you can stretch your budget a bit, a mid-tower provides more flexibility. Full towers and specialized SFF cases tend to be pricier, so ensure that the added cost aligns with your needs.

Which Case Size is Best for a Gaming PC?

Deciding on the ideal case size for a gaming PC can be a bit of a puzzle. We appreciate the sleekness of small form factor cases, especially for those tight on space. They’re neat, compact, and perfect for a minimalist setup. But, there’s a trade-off. These compact beauties can sometimes limit your choice of high-end components, especially the beefier GPUs.

Mid-tower cases, on the other hand, are the go-to for most gamers. They offer a sweet spot, balancing size with the ability to house powerful components. They’re versatile, and they’ve got room for those essential upgrades. If you’re the kind of gamer who wants a solid experience without going overboard, this might be your pick.

Then we have the full tower cases. These are the giants, built for sheer power. They’re spacious, often flashy, and if you’re thinking of a gaming setup that’s top of the line, this is where you should be looking. They can accommodate the latest tech, from multiple GPUs to advanced cooling systems. But, they’re not for everyone. They demand space and can be a bit heavy on the pocket.

So, the best case size hinges on your gaming goals and space constraints. 

Conclusion

The ideal PC case size is subjective. It’s tethered to your needs, preferences, and, of course, your budget. If you’re on the fence, the mid-tower is a safe bet, catering to a broad spectrum of needs. 

They’re versatile, accommodating a wide range of hardware while not being overly bulky. And we love the accessibility and affordability of mid-tower cases. They’re the go-to for many, and for a good reason.

But, let’s not forget the charm of the Mini Tower. For those on a budget, it’s a solid choice that doesn’t compromise on essentials. On the flip side, if you want to go all out, the Full Tower case is your playground. It’s spacious, allowing for top-tier components and cooling solutions.

So, take a moment, assess your needs, and make an informed choice. After all, your PC deserves a home that’s just right.

FAQs

What are the 4 types of computer case?

The four main types of computer cases are Full Tower, Mid Tower, Mini Tower (Micro-ATX), and Small Form Factor (SFF) or Mini-ITX.

How big is a mid-sized PC case?

A mid-sized PC case, also known as a Mid Tower, typically has a height between 16 to 18 inches (40 to 45 centimeters) and a width ranging from 7 to 9 inches (18 to 23 centimeters).

What determines the size of a computer case?

The size of a computer case is determined by its form factor, which dictates the type and size of the motherboard it can accommodate, as well as the number of expansion slots, drive bays, and the overall dimensions of the case.

What size is a mid ATX?

A mid ATX, commonly referred to as a Mid Tower, is designed to fit standard ATX motherboards. Its typical height ranges between 16 to 18 inches (40 to 45 centimeters), and its width is usually between 7 to 9 inches (18 to 23 centimeters).

Tianshu Wei

I'm a Computer Architect with several years of experience working in the industry. I started this site to share my passion and knowledge with other PC enthusiasts and provide useful tips and tricks.

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