Tips to Find the Right Size Storage Unit

Choosing the right size storage unit can feel tricky—too small and you’ll run out of room, too large and you’ll end up paying for unused space. The good news? With a few simple steps, you can figure out exactly what you need and avoid unnecessary costs.

Whether you’re decluttering, moving, or storing business inventory, here’s how to find a unit that fits your belongings and your budget.

1. Take Inventory of What You’re Storing

Start by making a quick list of everything you plan to store. Group similar items together—boxes, furniture, appliances, outdoor gear, etc.

Once you see it all written out, you’ll have a clearer picture of how much space you really need. This also helps you identify what can be stacked, what needs floor space, and what you might be able to donate or sell before moving into storage.

2. Think in Terms of Rooms

A helpful rule of thumb: storage unit sizes are often compared to the number of rooms you’re storing.

5×5: Like a small closet—good for boxes, seasonal décor, or small furniture.
5×10: Fits the contents of a studio or small one-bedroom apartment.
10×10: Comparable to a small bedroom—ideal for a one-bedroom home.
10×15: Works for a two-bedroom home or apartment with larger furniture.
10×20 and Up: Best for multi-bedroom homes, full moves, or vehicle storage.

If you’re between sizes, it’s usually smarter to size up slightly to avoid cramped or unsafe stacking.

3. Use a Storage Calculator or Size Guide

Many storage facilities offer online size guides or calculators that let you plug in the types of items you plan to store. These tools can give you an instant visual estimate of how much space you’ll need.

It’s also worth asking the facility manager for a quick walkthrough—they’ve likely helped hundreds of people choose the right size and can provide personalized advice.

4. Consider Accessibility and Organization

Think about how often you’ll need to access your items. If you’ll be in and out frequently:

Leave an aisle down the middle so you can reach items in the back.
Place frequently used items near the front of the unit.
Consider shelving or stackable bins to make the most of vertical space.

If you won’t be accessing the unit often, you can pack more tightly—but still avoid overloading boxes or placing heavy items on fragile ones.

5. Don’t Forget Odd-Shaped or Large Items

Couches, mattresses, bikes, and outdoor equipment can quickly eat up space. Measure these items before choosing a unit size, and don’t forget about their shape—some items may need to stand upright or lie flat, affecting how much floor area they take.

6. Visit the Facility Before You Decide

Storage unit dimensions are approximate, and seeing them in person can make a huge difference. Walking through available unit sizes helps you visualize how your belongings will fit—and gives you a chance to check for cleanliness, lighting, and accessibility.

The Bottom Line

The right storage unit size depends on what you’re storing and how you plan to use it.
Start with an inventory, compare size guides, and when in doubt, ask for help from the facility team. A little planning up front saves money, stress, and multiple trips later.