Renting a storage unit that's too small means a return trip to swap for a bigger one, or belongings that just don't fit. Renting one that's too big means paying every month for square footage you're not using. Answer a few quick questions to get a straightforward unit size to start comparing facilities.
Your recommendation starts from your home size — more bedrooms generally means more furniture and boxes to store, so it starts from a bigger unit class. From there, a few things can size the recommendation up to the next class:
This is a rule-of-thumb, not a precise cubic-footage calculation of your belongings — treat it as a solid starting point for comparing units, not the final word on the one size guaranteed to fit everything.
Say you're moving from a 3-bedroom home, with “Average” furniture, garage items you also want to store, and about 90 boxes packed.
Storage unit size labels aren't fully standardized across the industry. Some facilities advertise a unit by its floor footprint alone — width and depth — without stating ceiling height, and height has a real effect on how much you can actually fit inside once boxes are stacked. A 10×10 with an 8-foot ceiling holds noticeably less than a 10×10 with a 12-foot ceiling, even though both are marketed under the same label. Treat the size class here as a starting point for comparing facilities and requesting quotes, not a guarantee that everything you own will fit in the unit it recommends. Unusually large, heavy, or oddly shaped items — mattresses, appliances, exercise equipment, furniture that won't disassemble — may need a bigger unit or special handling regardless of what size this tool suggests. Ask about ceiling height and access before booking.
A 2-bedroom apartment with an average amount of furniture and no garage or storage-area items to add usually fits a 10×10 unit. Add a lot of furniture, garage or storage contents, or a higher-than-typical box count, and the recommendation moves up to a 10×15 or larger — use the calculator above with your own numbers for a more specific answer.
For an open-ended stay, sizing up one class is usually worth the extra monthly cost. It leaves room to add items later without renting a second unit, makes it easier to reach things without unpacking around them, and gives you a buffer if you underestimated how much you actually have. Treat the recommendation here as a floor, not a ceiling, for long-term storage.
Generally yes — climate-controlled storage is typically offered in the same size classes as standard units, though availability varies by facility and climate control usually costs more for the same footprint. The size recommendation from this calculator holds either way; whether you need climate control depends more on what you're storing, like electronics, wood furniture, photos or instruments, than on how much of it there is.
Treat the result as a starting point rather than a final answer. If your numbers land close to the boundary between two sizes, or your move includes bulky or irregularly shaped items, it's usually worth sizing up one class or asking the facility to walk through your inventory before you commit to a unit.
Want a tighter estimate than a home-size rule of thumb? For a more precise volume estimate based on your exact furniture, try the Furniture Volume Calculator and compare the result against the unit size above.
Keeping everything with you instead of putting it in storage? The Moving Truck Size Calculator will help you find the right truck instead of a storage unit.
Factoring storage into your bigger plan? Estimate your total moving cost, storage included, with local, long-distance, and DIY options.