What Size Storage Unit Do I Need? A Simple Guide for First-Time Renters

January 16, 2026 Self Storage 101

Whether you’re looking to store your small business inventory or the contents of a 4-bedroom home, knowing what size self storage unit you need saves time and money. You don’t want to have your unit half packed before you realize it’s too small, and you don’t want to spend extra money on a unit that’s too large. That’s where a storage unit size guide comes in handy — it takes the guesswork out of choosing the right fit.

My Storage Plus offers a variety of self storage unit sizes at all of their locations. From a small 5 x 5 storage unit all the way up to a huge 20 x 30 storage unit, My Storage Plus can find the right fit for your needs. Plus, parking for boats, RVs, and other vehicles is available at select locations.

Storage unit size guide showing boxes and household items being moved into a self storage facility

How Do I Choose the Right Storage Unit Size?

Here are some guidelines that will help you determine the storage space that you need.

Take inventory of Your Items

Consider the number of boxes, measure appliances and large items, and take into account any large or irregularly-shaped items like bicycles or exercise equipment.

Use Size Guides and Visit the Unit Prior to Reserving

Most self storage websites include a storage unit size guide and many have an interactive space calculator. After you check those resources, if possible, visit your facility and look at various sized storage units so that you can visualize your items in the space.

It’s Better to Overestimate than Underestimate

Using all of the resources at your disposal won’t  always determine the exact size unit for your belongings. Of course you don’t want to spend extra money; but, if you’re uncertain, it’s better to spend a few extra dollars for sufficient room. Additionally, it’s important to have enough space for a path between boxes and large items. Flexible lease terms make it easy to downsize if necessary.

Think About Storage Unit Dimensions

There are countless self storage unit sizes, but they fall into three major categories: small, medium, and large. These units are typically sized as length by width, making it easy to estimate your floor space by square footage. For example, a 5 x 10 unit is 50 sq. ft.

Most units have a height of eight feet, giving you extra vertical space. You can save space by stacking boxes and containers.

Look for Packing and Organizing Tips

After you locate the right unit, be sure to get it packed and organized properly to make the best use of your space. Check our Storage Tips for more information.

How Much Storage Space Do I Need?

The typical unit sizes that will give you a rough idea of what you need. This is the type of information you’ll see on most size guides.

  • 5 x 5 (25 sq. ft.): The size of a walk-in closet. Ideal for boxes, books, seasonal items (garden tools and pool toys), clothing,  office supplies, and twin size mattresses.
  • 5 x 10 (50 sq. ft.): This is a good size to store a mid-size bedroom, office, or an entire studio apartment.
  • 10 x 10 (100 sq. ft.): An entire living room and two full bedrooms are a good fit for this space.
  • 10 x 15 (150 sq. ft.): A three-bedroom house will fit in this size unit. It’s ideal for large  screen tvs, sporting equipment, bikes, pianos, and tables.
  • 10 x 20 (200 sq. ft.): This space is ideal for a five-bedroom house, including large appliances. This unit is also big enough for cars, boats, and other vehicles.
  • 10 x 30 (300 sq. ft.): This unit has enough space to store a five- to seven-bedroom home or a large vehicle or small boat with room to spare. If you’re making a cross-country move, this size will enable you to store the entire contents of your home if there are time constraints.

Vehicle Parking:  Most facilities offer indoor, covered, and open parking spaces for cars, boats, and RVs. Check our Vehicle Storage page for detailed information.

We’re Here to Help You Find the Right Size

Whatever your storage needs, the information in this article can get you moving in the right direction. If you’re still uncertain, don’t worry. One of our friendly, knowledgeable team members can answer your questions and help you find the right fit for your needs. We want to make you and your belongings as comfortable as possible.

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Abner Frando

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