Storage Unit Cost Calculator
The Advertised Rate Is Rarely the Whole Bill
Self-storage facilities quote a per-square-foot or flat monthly rate, but the number that hits your card each month usually includes insurance and a one-time admin or setup fee layered on top. This calculator adds all three together across the full rental period, so the total cost of a lease is clear before you sign, not discovered a few months in.
The Formula
Insurance is applied monthly and compounds across the full duration, while the admin fee is added once, reflecting how most facilities structure their billing.
Where This Calculation Matters
- Comparing facilities — two units with similar advertised rates can have very different total costs once admin fees and mandatory insurance are factored in.
- Budgeting a move-related storage gap — estimating total cost for the months between move-out and move-in dates.
- Deciding between unit sizes — seeing the full-period cost difference between, say, a 5×10 and a 10×10 unit makes the size-versus-cost tradeoff concrete.
- Business inventory storage — small businesses renting overflow storage can project the annual cost impact before committing to a lease.
| Unit size | Square feet | Monthly cost | 6-month total |
|---|---|---|---|
| 5×5 | 25 | $37.50 | $225.00 |
| 5×10 | 50 | $75.00 | $450.00 |
| 10×10 | 100 | $150.00 | $900.00 |
| 10×15 | 150 | $225.00 | $1,350.00 |
| 10×20 | 200 | $300.00 | $1,800.00 |
Computed directly from the formula above at a $1.50/sq ft monthly rate; actual rates vary widely by region and facility climate control.
How to Use This Calculator
- Enter the unit length and width in feet.
- Enter the rate per square foot in dollars.
- Enter the rental duration in months.
- Optionally enter an admin fee and monthly insurance cost.
- Select Calculate to get the total cost for the full rental period.
Related Calculations
Figure out how much space you actually need first with the Cubic Feet Calculator, or estimate warehouse pallet capacity with the Warehouse Storage Calculator.