Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Total annual revenue
$416,500
Small unit revenue
$108,800
Medium unit revenue
$205,700
Large unit revenue
$102,000
Blended rate per occupied sq ft
$10.89
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How to use this
- 1Enter small units — total sq ft.
- 2Enter small unit rate ($/sqft/yr).
- 3Enter medium units — total sq ft.
- 4Enter medium unit rate ($/sqft/yr).
- 5Enter large units — total sq ft.
- 6Enter large unit rate ($/sqft/yr).
- 7Enter economic occupancy (%).
- 8Read your total annual revenue on the right — it updates as you type.
- 9Hit Share to keep the scenario or send it to someone.
About this calculator
Not all storage square footage earns the same. Small units (5x5, 5x10) rent for a higher price per square foot than large units (10x30) because demand is denser and turnover costs are proportionally smaller relative to rent. A facility that leans too heavily on large units often has lower blended revenue per square foot even at full occupancy. This calculator takes your total building footprint split across three size tiers, applies a rate per square foot to each tier, and rolls up blended annual revenue and revenue per square foot so you can compare mix scenarios before finalizing a unit-mix study for new construction or a conversion project.
Worked example
Using the values the calculator loads with:
Inputs
- Small units — total sq ft: 8000
- Small unit rate: 16 $/sqft/yr
- Medium units — total sq ft: 22000
- Medium unit rate: 11 $/sqft/yr
- Large units — total sq ft: 15000
- Large unit rate: 8 $/sqft/yr
- Economic occupancy: 85 %
Results
- Total annual revenue: $416,500
- Small unit revenue: $108,800
- Medium unit revenue: $205,700
- Large unit revenue: $102,000
- Blended rate per occupied sq ft: $10.89
What each field means
Inputs
- Small units — total sq ft
- The small units — total sq ft used in the calculation. Starts at 8000 so you have a working example on load.
- Small unit rate ($/sqft/yr)
- The small unit rate used in the calculation, measured in $/sqft/yr. Starts at 16 $/sqft/yr so you have a working example on load.
- Medium units — total sq ft
- The medium units — total sq ft used in the calculation. Starts at 22000 so you have a working example on load.
- Medium unit rate ($/sqft/yr)
- The medium unit rate used in the calculation, measured in $/sqft/yr. Starts at 11 $/sqft/yr so you have a working example on load.
- Large units — total sq ft
- The large units — total sq ft used in the calculation. Starts at 15000 so you have a working example on load.
- Large unit rate ($/sqft/yr)
- The large unit rate used in the calculation, measured in $/sqft/yr. Starts at 8 $/sqft/yr so you have a working example on load.
- Economic occupancy (%)
- The economic occupancy used in the calculation, measured in %. Starts at 85 % so you have a working example on load. Accepted range: 10–100 %.
Results
- Total annual revenue
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Small unit revenue
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Medium unit revenue
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Large unit revenue
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Blended rate per occupied sq ft
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
Why do small units rent for so much more per square foot?
Demand for 5x5 and 5x10 units is broader (renters, students, seasonal storage) and turnover happens faster, but each move-out only costs you cleaning a tiny space. The rent premium compensates for higher management intensity per dollar of revenue, not because small units cost more to build.
What's an ideal unit mix for a new build?
Most feasibility studies target roughly 25-30% small, 45-50% medium, and 20-25% large by square footage, adjusted for local demographics — more multi-family nearby favors small units, more single-family and business storage favors medium-large.
Should I convert large units to small ones in an existing facility?
Only if you have sustained waitlist demand for small units and the conversion cost (adding walls, doors) pencils against the rent premium. Run this calculator with the proposed post-conversion mix and compare to current revenue before committing capital.
Does unit mix affect occupancy stability?
Yes. Small units turn over more often, which means more marketing spend and vacancy risk between tenants even if the annual rate is higher. Large units are stickier — businesses and long-term movers rarely churn monthly — which stabilizes economic occupancy at the cost of some ceiling on rate.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
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Model gross potential rent, economic occupancy, and net operating income for a storage property.
Self-Storage Rent Per Square Foot Calculator
Convert a monthly unit price into an annualized rate per square foot to compare units and competitors fairly.
Self-Storage Occupancy Breakeven Calculator
Find the occupancy percentage where rent revenue covers fixed and debt costs.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Self-Storage Unit Mix Revenue Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/self-storage-unit-mix-optimizer
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/self-storage-unit-mix-optimizer" target="_blank" rel="noopener">Self-Storage Unit Mix Revenue Calculator — RevenueLab</a> (2026).</p>
Source: [Self-Storage Unit Mix Revenue Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/self-storage-unit-mix-optimizer) (2026).