Self-Storage ROI Calculator
Self-storage cap rate.
Calculate self-storage ROI using cap rate, NOI, occupancy, rent per unit, and operating expenses for any self-storage facility scenario.
What this tool does
This calculator estimates the cap rate and stabilised net operating income (NOI) for a self-storage facility based on its financial profile. Cap rate represents the annual return generated by the property relative to its purchase price, expressed as a percentage. The calculation takes your facility price, number of units, average monthly rent per unit, occupancy rate, and operating expense ratio as inputs. It then models the annual revenue by multiplying units, monthly rent, occupancy, and 12 months, then subtracts operating costs to derive NOI. The cap rate is computed by dividing NOI by the facility price. Results are most sensitive to changes in occupancy and rent assumptions. This tool illustrates how these variables interact in a stabilised operating scenario and is provided for educational exploration of real estate returns, not as a basis for investment decisions.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Self-storage ROI calculator measures cap rate for storage facility investments. 2M facility, 200 units, 150/month average rent, 85% occupancy, 35% opex = 360,000 gross potential rent, 306,000 effective gross at 85% occupancy, 198,900 NOI after 35% opex, 9.95% cap rate. Self-storage typically 6-9% cap rate - higher than apartments due to operational simplicity.
Example: 2,000,000 self-storage facility, 200 units, 150 average monthly rent. Gross potential rent = 360,000 annual. 85% occupancy = 306,000 effective gross. 35% opex = 107,100. NOI = 198,900. Cap rate = 9.95%. Strong return reflects industry efficiency: minimal tenant management, low turnover, recession-resistant.
Self-storage advantages: (1) Recession-resistant (people downsize, store stuff, divorce, life events keep demand). (2) Low operational complexity vs multifamily. (3) Lower maintenance costs (basic doors and walls). (4) Fewer regulations than residential. (5) Often automated (kiosk check-in, app payments). (6) Insurance income stream (mandatory tenant insurance markup). Disadvantages: oversupply in some markets (recent build-out), commodity pricing competition, REIT-dominated industry.
A worked example
Take a 2,000,000 facility with 200 storage units, 150 average monthly rent per unit, and 85% occupancy: the tool returns 9.95%. You can adjust any input and the result updates as you type, with no submit button or reload, so you can see how sensitive the output is to one or two assumptions.
What moves the number most
The result responds to Facility Price, Total Storage Units, Average Monthly Rent per Unit, Occupancy %, and Operating Expense Ratio %. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
The formula behind this
Effective gross = units × rent × occupancy × 12. NOI = effective gross × (1-opex). Cap rate = NOI / price. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.
Why run this
Running the numbers makes the trade-offs concrete. Small changes in the inputs can move the result more than intuition suggests, which is hard to judge without working it out.
What this doesn't capture
This is a simplified model that holds its assumptions constant. Real outcomes vary with market conditions, costs, taxes, and timing, so the figure is best read as one scenario rather than a forecast.
£2,000,000, 200 units × £150/mo at 85% = 9.95%.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator computes cap rate by first deriving net operating income (NOI), then dividing by property price. Gross potential revenue is calculated by multiplying total storage units by average monthly rent per unit and annualizing over 12 months. This figure is then adjusted downward by the occupancy percentage to reflect realistic income collection. Operating expenses are modelled as a fixed ratio of effective gross income (gross potential rent after the occupancy adjustment); NOI equals effective gross income minus those operating expenses. Cap rate—expressed as a percentage—represents the relationship between NOI and total facility price, commonly used to compare self-storage investment returns. The model assumes constant monthly rent, stable occupancy, and operating expenses as a consistent proportion of revenue. It does not account for vacancy loss beyond the occupancy input, financing costs, capital expenditures, tenant turnover, seasonal fluctuations, or tax implications.
References
Frequently Asked Questions
Self-storage vs multifamily?
Self-storage demand drivers?
Industry consolidation?
Operating efficiency tips?
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