Storage unit sizes
US self-storage units run from 5x5 (25 square feet) to 10x30 (300 square feet), almost always with an 8-foot ceiling. The most rented size is the 10x10, which holds a one to two-bedroom home. Floor area is what facilities advertise; volume is what determines whether your belongings fit.
- 8 standard sizes
- 25–300 sq ft
- 200–2,400 cu ft
Storage unit size chart
| Unit size | Floor area | Approximate volume* | Usable volume | Typical use | Monthly cost |
|---|---|---|---|---|---|
| 5×5 | 25 sq ft | 200 cu ft | 170 cu ft | Part of one room | $40–$75 |
| 5×10 | 50 sq ft | 400 cu ft | 340 cu ft | Studio apartment | $55–$110 |
| 5×15 | 75 sq ft | 600 cu ft | 510 cu ft | 1 bedroom apartment | $75–$140 |
| 10×10 | 100 sq ft | 800 cu ft | 680 cu ft | 1–2 bedroom apartment | $90–$180 |
| 10×15 | 150 sq ft | 1,200 cu ft | 1,020 cu ft | 2 bedroom home | $125–$240 |
| 10×20 | 200 sq ft | 1,600 cu ft | 1,360 cu ft | 3 bedroom house | $160–$310 |
| 10×25 | 250 sq ft | 2,000 cu ft | 1,700 cu ft | 4 bedroom house | $195–$370 |
| 10×30 | 300 sq ft | 2,400 cu ft | 2,040 cu ft | 4–5 bedroom house | $225–$440 |
*Assumes an 8-foot ceiling. Actual usable capacity varies by layout, door clearance, packing density and aisle space. Cost is a national reference range reviewed August 2026.
Every size in detail
- 5×5 A small walk-in closet. Fits part of one room, or about 56 medium boxes. Explore 5×5 →
- 5×10 A large walk-in closet or a garden shed. Fits studio apartment, or about 113 medium boxes. Explore 5×10 →
- 5×15 A long, narrow single garage bay. Fits 1 bedroom apartment, or about 170 medium boxes. Explore 5×15 →
- 10×10 Half a standard one-car garage. Fits 1–2 bedroom apartment, or about 226 medium boxes. Explore 10×10 →
- 10×15 A large one-car garage. Fits 2 bedroom home, or about 340 medium boxes. Explore 10×15 →
- 10×20 A standard one-car garage. Fits 3 bedroom house, or about 453 medium boxes. Explore 10×20 →
- 10×25 A stretched one-car garage. Fits 4 bedroom house, or about 566 medium boxes. Explore 10×25 →
- 10×30 A two-car garage. Fits 4–5 bedroom house, or about 680 medium boxes. Explore 10×30 →
How storage unit sizes are measured
A storage unit is quoted as width × length in feet. A 10x10 is 10 feet wide by 10 feet deep, giving 100 square feet (sq ft) of floor space. Ceiling height is almost always 8 feet and is rarely advertised, which is why floor area alone is a poor guide: the same 100 sq ft holds 800 cubic feet (cu ft) at 8 ft and 1,000 cu ft at 10 ft.
Two cautions worth carrying into a facility visit. Advertised dimensions are nominal — a "10x10" is frequently 9 ft 6 in by 9 ft 8 in once you measure inside the walls. And the door opening is always narrower than the unit, which is what actually stops a sofa going in. Our measuring guide covers what to record before you rent.
Floor area versus volume
Floor area tells you what you can stand on. Volume tells you what you can store. Because you stack, volume is the number that decides the size, and it is the number every calculator on this site works in. The volume guide shows the arithmetic.
Which size do you need?
| Home size | Estimated volume | Recommended unit | Fill rate |
|---|---|---|---|
| Studio apartment | 278 cu ft | 5x10 | 82% |
| 1 bedroom apartment | 445 cu ft | 10x10 | 65% |
| 2 bedroom apartment | 630 cu ft | 10x15 | 62% |
| 3 bedroom house | 1,168 cu ft | 10x20 | 86% |
| 4 bedroom house | 1,632 cu ft | 10x30 | 80% |
Compare two sizes side by side
- 5x5 vs 5x10 Part of one room against studio apartment, with the cost difference. Compare →
- 5x10 vs 10x10 Studio apartment against 1–2 bedroom apartment, with the cost difference. Compare →
- 10x10 vs 10x15 1–2 bedroom apartment against 2 bedroom home, with the cost difference. Compare →
- 10x15 vs 10x20 2 bedroom home against 3 bedroom house, with the cost difference. Compare →
- 10x20 vs 10x30 3 bedroom house against 4–5 bedroom house, with the cost difference. Compare →
Related questions
What are the standard storage unit sizes?
5x5, 5x10, 5x15, 10x10, 10x15, 10x20, 10x25 and 10x30 are the standard US sizes. Some facilities also offer lockers under 5x5 and oversized units above 10x30, but those eight cover almost everything on the market.
What is the most common storage unit size?
The 10x10. It holds a one to two-bedroom home, which matches the most common reason people rent storage — a move, a renovation or a downsize. It is also the size most often booked one step too small.
How tall is a storage unit?
Eight feet in most US facilities. Some newer buildings offer 10 ft ceilings, which adds roughly 25% more usable volume for the same floor area — worth asking about before you size up.
What is the smallest storage unit?
A 5x5, at 25 sq ft and about 200 cu ft. Some facilities also rent lockers of 3x3 or 5x5 with a lower ceiling for documents and small boxes.