Storage Unit Size Estimator
Tell us roughly what you’re storing and we’ll estimate the volume, the floor area it needs, and the smallest standard self-storage unit that will hold it.
Storage unit you’ll need
Assumes an 8 ft stack height at ~60% packing efficiency (aisle space and imperfect stacking). Leave a walkway if you'll need to reach items mid-rental.
Size it before you sign
The two ways to get a storage unit wrong are renting one that’s too small — so your things end up crammed, crushed, or left behind — and paying every month for a half-empty unit that’s bigger than you ever needed. Working from the actual volume of your belongings avoids both. A studio’s worth of boxes and a couple of chairs is a very different job from a three-bedroom house with appliances, and a good estimate reflects that.
Enter your counts, note the recommended unit, and then plan how you’ll pack it: heavy boxes low, light and fragile items on top, and a clear aisle down the middle so you can reach the back without unloading the front.
Frequently Asked Questions
What size storage unit do I need?
It depends on the volume of what you're storing, not just the item count. This estimator adds up the typical packed volume of your boxes, furniture, and appliances in cubic feet, converts that to the floor area a unit needs assuming an eight-foot stack height and realistic packing efficiency, then picks the smallest standard unit (from 5×5 up to 10×30) that fits.
Why isn't the unit just my total volume divided by the ceiling height?
Because you can never fill a unit solid. You need an aisle to reach items, you can't safely stack everything to the ceiling, and boxes and furniture don't tessellate perfectly. The tool applies about a 60% packing efficiency to account for that wasted space, which is why the floor area it suggests is larger than a naive volume-over-height figure.
What counts as a 'furniture piece' or 'appliance'?
A furniture piece is an average large item — a dresser, a sofa section, a dining table, a bed frame — estimated at about 25 cubic feet. An appliance is a big white good like a fridge, washer, or dryer at about 30 cubic feet. If an item is much bigger or smaller than average, adjust the counts up or down to compensate.
Should I round up to the next unit size?
Usually yes. It's cheaper and far less stressful to have a little spare room than to discover on move-in day that everything won't fit. Rounding up also leaves you a walkway, which matters a lot if you'll need to retrieve things partway through the rental.
Is this an exact quote?
No — it's a planning estimate. Facilities size and describe units differently, ceiling heights vary, and how you pack makes a real difference. Use the result to shortlist a unit size, then confirm the actual dimensions with the facility before you book.
A planning estimate based on typical item volumes, an 8 ft stack height, and ~60% packing efficiency. Actual unit dimensions and how you pack will vary — confirm sizes with the facility before booking.