Storage Unit Size Calculator
Add all the items you plan to store — you can even include your own custom items by entering their length, width, and height.
Let the calculator give you an estimate of the unit size you'll need and how much of it you'll use.
Enter your ZIP or city to compare nearby storage options and prices, so you can reserve your ideal unit near you.
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Select your items to calculate the best storage unit size.
How to determine what size storage unit you need?
Self storage is a convenient way to keep belongings safe when you're moving, downsizing, or simply decluttering. Many people use storage units for furniture, clothing, appliances, vehicles, and hobby gear — even RVs and boats. Because these items come in all shapes and sizes, it's important to choose the right storage unit dimensions.
5'x5' Storage Unit
A 5'x5' storage unit is perfect for small batches. Think compact outdoor gear, small furniture like office chairs, or a few boxes of clothing and household items. It's about the size of a walk-in closet — great for minimal storage needs.
5'x10' Storage Unit
If you have slightly larger belongings — such as a twin mattress, nightstands, TV, mini fridge, and several boxes — a 5'x10' storage unit offers just enough space. This size is ideal for college students storing personal items over summer break or renters between moves.
10'x10' Storage Unit
The 10'x10' unit is the most popular option. It can hold the contents of a studio or one-bedroom apartment, including a king-size bed, dresser, nightstands, kitchen tools, appliances, and boxes. It's also great for outdoor furniture, bulky clothing, or seasonal gear.
10'x15' Storage Unit
For a two-bedroom apartment, a 10'x15' unit provides the space you need. You can store dressers, couches, tables, TVs, mattresses, and décor — plus recreational gear like skis, bikes, or fishing equipment. It's a great middle-ground between compact and spacious storage.
10'x20' Storage Unit
A 10'x20' storage unit works well for larger households or those needing vehicle storage. It fits furniture from a two-bedroom home, including sofas, dining sets, washers and dryers, and multiple boxes. It also accommodates a standard-size car with room to spare.
10'x30' Storage Unit
The 10'x30' unit is the largest standard size, suitable for a three- to four-bedroom home. You can store bedroom and living room furniture, large appliances, dining sets, clothing, and outdoor equipment. It can even fit a pickup truck or a small boat.
How to organize your storage unit
A well-organized unit saves time and space – and helps prevent damage. Follow these best practices to keep your storage space neat, efficient, and easy to use.
Inventory
List everything you plan to store – a simple checklist, or even a quick sketch of your unit layout works fine. Before sealing boxes, take photos of your items and record serial numbers for anything valuable. You could also update your list whenever you add or remove something, so it always reflects what's in storage.
Label everything
Group items by category before packing, then label each packaging with what's inside. Once in the unit, place the things you'll reach for often near the front and at eye level, and let the labeled side face the entrance to the storage unit. That way, you'll see where everything is as soon as you walk in.
Use vertical space
Place heavier furniture or boxes on the bottom, with lighter or fragile items safely above, but avoid piling boxes too high to reduce the risk of tipping. As you organize your boxes, leave a clear walkway down the center so you can reach everything in the back without moving stacks around.
Frequently Asked Questions
How do you calculate storage size?
To calculate the right storage unit size, start by measuring your larger items — multiply their depth, width, and height to estimate the space they'll take up. Then, factor in your boxes, furniture, and smaller belongings.
For an easier and more accurate estimate, use our storage unit size calculator. Simply select the items you plan to store, and we'll show you the ideal unit size so you only pay for the space you actually use.
Need more guidance? Check out our detailed storage unit size guide to compare dimensions, layouts, and what typically fits in each unit – from small 5'x5' lockers to large 10'x20' spaces.
What are the most common storage unit sizes?
The most popular unit size across the U.S. is the 10'x10', offering about 100 square feet of space – roughly the size of a standard bedroom.
- Small storage units: 5'x5' and 5'x10' – great for boxes, seasonal décor, or small furniture.
- Medium storage units: 10'x10' and 10'x15' – ideal for the contents of a one- or two-bedroom apartment.
- Large storage units: 10'x20' and up – perfect for storing a full household, large furniture, or even a vehicle.
How tall is a standard storage unit?
Most standard self storage units are about 8 feet tall, but some facilities feature higher ceilings – up to 10 or even 12 feet – offering extra vertical space for stacking boxes or tall furniture. Smaller storage lockers are shorter, ideal for compact storage needs.
For exact dimensions, check the details for your local storage facility or use our calculator to explore storage sizes available near you.
What if the storage unit I choose is too small?
No need to worry – most storage facilities make it easy to upgrade to a larger unit at any time. If you're unsure, it's often better to start slightly bigger, especially if you plan to add more items later.
Our size calculator can help you avoid that guesswork, ensuring you find the perfect fit from the start – saving you time, money, and stress.