Self Storage NOI Calculator
Self storage NOI, net operating income, is the number every valuation and cap rate is built on, and the one a seller's numbers most often flatter. Build it below from gross rent, vacancy, other income, and expenses, then read on for the formula, the two line items brokers leave out, and how to sanity-check a pro forma.
How to calculate NOI for self storage
The self storage NOI formula works down an income statement in stages. You never jump straight from gross rent to net operating income. Build effective gross income first, then subtract every operating expense.
NOI = EGI − Operating expenses
Net operating income sits before debt service, capital expenditures, depreciation, and income tax, which is exactly why it is comparable across buyers and why cap rate divides it by price. The NOI calculation for self storage lives or dies on the two lines this tool forces in: a market-rate management fee, added even when the seller self-manages, and replacement reserves. Leave them out and the net operating income looks bigger than the facility can actually sustain.
Self storage NOI benchmark and the operating expense ratio
The fastest gut-check on any self storage NOI is the operating expense ratio: total operating expenses divided by effective gross income. For a stabilized facility this typically lands around 35%–45%, drifting lower for unmanned or larger sites. When a broker's trailing-12 NOI implies an expense ratio in the 20s, the pro forma NOI has usually been scrubbed of a management fee, reserves, a post-sale property-tax reassessment, or real payroll. Self storage NOI by market varies, but the expense ratio is a portable sanity check. For a formal definition of the metric, Investopedia's net operating income primer is a solid reference.
NOI FAQ
What is the self storage NOI formula?
NOI = effective gross income − operating expenses. Effective gross income (EGI) is gross potential rent minus vacancy and credit loss, plus other income (admin fees, late fees, tenant insurance, retail). Operating expenses exclude debt service, capital expenditures, depreciation, and income tax. Everything above the NOI line is operations; everything below it is financing and accounting.
How do you calculate NOI for a self storage facility?
Start with gross potential rental income, subtract economic vacancy and credit loss to get collected rent, add other income for effective gross income, then subtract all operating expenses. Two line items sellers routinely leave out: a market-rate management fee (5%–6% of EGI, even if the owner self-manages) and replacement reserves. Add them back and you get a normalized NOI a lender and a buyer will both accept.
Does NOI include the mortgage?
No. Net operating income is calculated before debt service, so the loan payment is not an operating expense. That is deliberate: NOI measures the property’s ability to produce income independent of how any one buyer finances it, which is why cap rate (NOI ÷ price) is an unlevered return.
What is the difference between NOI and EBITDA for self storage?
They are close but not identical. NOI is a property-level real-estate metric: EGI minus property operating expenses, before any corporate overhead. EBITDA is a business metric that can fold in corporate G&A, and it does not always deduct a management fee or reserves. For underwriting a single facility, NOI is the number that drives value; brokers occasionally quote EBITDA to make cash flow look larger.
What is a good operating expense ratio for self storage?
For a stabilized facility, operating expenses typically run about 35%–45% of effective gross income, with unmanned and larger facilities toward the low end. A quoted expense ratio well under 30% is a flag to normalize: it usually means the seller omitted a management fee, reserves, property tax reassessment on sale, or off-books labor.
Should I use trailing-12 or pro forma NOI?
Underwrite on trailing-12 actuals, the real income and expenses for the last twelve months, and treat pro forma NOI as a separate, clearly labeled upside case. Pro forma numbers assume rate increases, lease-up, or expense cuts that have not happened yet. Paying today for tomorrow’s pro forma NOI is the most common way first-timers overpay.
Related: cap rate calculator and all self-storage investment calculators. NOI feeds cap rate and valuation. Those come next.