Calculate net operating income by subtracting operating expenses from effective gross income. NOI excludes debt service and is the basis for cap rate analysis.
Net Operating Income (NOI) is the foundation of commercial and residential investment property analysis. It represents the total income a property generates after subtracting all operating expenses but before accounting for debt service, capital expenditures, and income taxes. NOI is the numerator in the cap rate formula and the key input for DSCR calculations.
This calculator walks you through the full NOI computation: start with potential gross income (all rents at full occupancy), subtract vacancy and credit loss to get effective gross income, then subtract every operating expense category. The result is a clean NOI figure you can use for cap rate analysis, loan underwriting, and property comparison.
Accurate NOI requires honest expense accounting. The most common mistake is underestimating operating costs, which inflates NOI and makes deals look better than they are. This calculator helps you be thorough by listing all major expense categories.
Homebuyers, investors, and real-estate professionals all benefit from precise net operating income (noi) figures when evaluating properties, negotiating deals, or planning long-term investment strategies. Save this calculator and revisit it whenever market conditions or your financial situation changes.
NOI is the single most important number in real estate investment analysis. Every major metric — cap rate, DSCR, and property valuation — depends on it. If your NOI is wrong, every downstream calculation is wrong. This tool ensures you account for all income sources and every expense line item for an accurate NOI.
Potential Gross Income (PGI) = Sum of all rents at 100% occupancy Effective Gross Income (EGI) = PGI + Other Income − Vacancy Loss NOI = EGI − Total Operating Expenses Note: Operating expenses EXCLUDE debt service, capital expenditures, and depreciation.
Result: NOI = $77,700
Potential gross income is $120,000 + $6,000 other income = $126,000. Vacancy loss at 5% of PGI = $6,000, giving an EGI of $119,700 (accounting only against the $120,000 rental portion). Total operating expenses of $42,000 yield an NOI of $77,700. At a 7% cap rate, this implies a property value of $1,110,000.
The most common mistake in NOI calculation is underestimating expenses. Sellers and listing agents often present a "pro-forma" NOI using projected rents and below-actual expenses. Always request trailing 12-month operating statements and verify them against utility bills, tax assessments, and insurance declarations. Rebuild the NOI from scratch using your own assumptions.
Single-family rentals typically have NOI margins of 50–65% of gross rent. Multifamily properties range from 45–60%. Commercial properties vary widely: office buildings run 60–70% NOI margins, while retail can range from 50–80% depending on lease structure (triple-net leases push most expenses to tenants).
The income approach to property valuation divides NOI by the market cap rate. This is how commercial properties are appraised and priced. A 10% increase in NOI directly increases property value by the same proportion, making NOI improvement strategies (raising rents, cutting expenses) powerful value-add tools for investors.
Operating expenses include property taxes, insurance, property management fees, repairs and maintenance, utilities paid by the owner, landscaping, pest control, legal and accounting fees, advertising, and administrative costs. They exclude mortgage payments, capital expenditures, and depreciation.
NOI measures the property's intrinsic income-generating ability regardless of how it's financed. Two investors buying the same property with different loan terms would have different cash flows but the same NOI. This makes NOI the fair comparison metric for property valuation.
NOI is income minus operating expenses. Cash flow is NOI minus debt service (mortgage payments). Cash flow is what actually hits your bank account each month. NOI is the starting point; cash flow is the bottom line after financing costs.
No. Capital expenditures (CapEx) like roof replacement or HVAC systems are not operating expenses. However, routine repairs and maintenance ARE included. The line between CapEx and maintenance can be gray — generally, items over $5,000 that extend the property's life are CapEx.
Even at 100% occupancy, budget 3–5% for vacancy and credit loss. Tenants turn over, and there's always some gap between leases. Markets with strong demand may justify 3%, while softer markets need 7–10%. Review the property's historical vacancy rate for guidance.
Yes. If operating expenses exceed effective gross income, NOI is negative. This means the property loses money operationally before even considering debt payments. Negative NOI usually indicates severe vacancy, below-market rents, or excessive expenses that need to be addressed.