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Storage Unit Size Calculator: What Size Do I Need?

Screen nominal storage unit sizes from 5 × 5 to 10 × 30 ft, then verify the actual layout and access for your items.

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How it works

Floor area = (furniture volume + boxes × 3 cu ft) × aisle factor ÷ 7 ft stacking height

The volume of your things is the same estimate the truck calculator uses: a typical furniture volume for the home size plus about 3 cu ft per box. The model divides volume by a fixed editorial 7 ft stacking assumption. This is a theoretical floor-area screen, not a recommendation to stack any particular item that high. Zero contents returns zero units; fractional box counts round up. If you want an aisle to reach things during the rental, the calculator adds 20 %. It then picks the smallest standard unit with that floor area. The assumed two-bedroom furniture volume plus 40 boxes gives about 96 sq ft in this model, making a nominal 10 × 10 unit a candidate for a real layout check.

Standard storage unit sizes (approximate fit; companies' guides differ)
UnitFloor areaRoughly holds
5 × 5 ft 25 sq ft Boxes, a chair, seasonal items
5 × 10 ft 50 sq ft A studio
10 × 10 ft 100 sq ft A 1–2 bedroom apartment
10 × 15 ft 150 sq ft A 2-bedroom home
10 × 20 ft 200 sq ft A 3-bedroom home
10 × 30 ft 300 sq ft A 4-bedroom home or a packed garage

Frequently asked questions

Is a 10 × 10 unit enough for a 2-bedroom apartment?

The proxy-volume model may suggest 10 × 10, but inspect the actual layout, door, usable stacking height and access needs. Bulky or non-stackable pieces can require more floor area; do not assume ceiling-height stacking is safe.

Do I need climate control?

Compare the storage conditions required by your items with the actual facility features and agreement. Climate-control features and prices vary; do not assume a promised temperature or humidity range.

How can I fit more into a unit?

Use same-size boxes, stack them in columns, stand sofas on end if the manufacturer allows it, take beds and tables apart and put the things you will need first near the door.

Sources checked October 22, 2026. Provider specifications apply only to the equipment described. Model defaults and allowances are planning assumptions, not measured inventory or market prices.

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