Storage Unit Cubic Feet Calculator
Measure any storage unit's volume in cubic feet. Includes a separate subwoofer box calculator below.
Standard Storage Unit Sizes
| Unit | Cubic Feet | Holds |
|---|---|---|
| 5×5×8 | 200 ft³ | Small closet / boxes |
| 5×10×8 | 400 ft³ | Studio or 1-bed apartment |
| 10×10×8 | 800 ft³ | 2–3 bedroom home |
| 10×15×8 | 1,200 ft³ | 3-bedroom home with appliances |
| 10×20×8 | 1,600 ft³ | 3–4 bedroom home + vehicles |
| 10×30×8 | 2,400 ft³ | 5+ bedroom home / commercial |
Subwoofer Box Calculator
Enter inside dimensions of your enclosure. Result is gross volume — subtract driver and port displacement for net (tuned) volume.
Subtract driver displacement (typ. 0.08–0.2 ft³) and port volume for net.
Sealed enclosures typically need 0.5–1.5 ft³ per 10-inch sub. Ported boxes need 1.5–3 ft³ plus port volume.
Choosing Storage Unit Size
List your largest items first (mattresses, sofas, appliances) and estimate their volume. Most household items pack at ~50% efficiency due to irregular shapes, so plan for 1.5–2× the raw item volume. Use vertical space — sturdy stackable boxes maximize cubic feet per dollar.
Estimating Household Item Volume
| Item | Cubic Feet |
|---|---|
| Queen mattress | 25–30 ft³ |
| Sofa (3-seat) | 60–90 ft³ |
| Refrigerator (exterior) | 40–60 ft³ |
| Dresser | 20–30 ft³ |
| Washer or dryer | 25–30 ft³ |
| Small box | 1.5 ft³ |
| Large box | 4.5 ft³ |
Add up your largest items using this table, then add 20–30% for boxes and irregular gaps between furniture. If you're planning a full move rather than storage, the shipping volume calculator covers truck-load estimating in more detail, and the weight calculator helps confirm you're within a rental truck's payload limit, not just its cubic footage.
Frequently Asked Questions
How big is a 10x10 storage unit?
10 ft × 10 ft × 8 ft = 800 cubic feet. Fits the contents of a 2–3 bedroom home.
How many cubic feet in a 5x5 storage unit?
5 × 5 × 8 = 200 cubic feet. Fits a small closet's worth of items.
What size storage unit do I need for a 1-bedroom apartment?
5×10 (400 ft³) is typical for a furnished 1-bedroom.
How do I calculate subwoofer box volume?
Multiply internal L × W × D in inches, divide by 1,728. Subtract driver and port displacement for net volume.
What is net vs gross volume for a sub box?
Gross is the empty internal volume. Net subtracts what the driver, port and bracing occupy — typically 5–15% less.
How tall are storage units?
Most are 8 feet tall; some climate-controlled units are 9–10 feet.
Can I climb on items to stack high?
Storage facilities prohibit it. Use shelves and lighter items on top.
What is the cubic feet of a 10x20 storage unit?
10 × 20 × 8 = 1,600 cubic feet. Fits a 3–4 bedroom home.