NOI Calculator
Calculate net operating income with itemized operating expenses. Determine your property's true income potential after accounting for vacancy and all operating costs.
Quick Answer
NOI = Gross Income x (1 - Vacancy Rate) - Operating Expenses. A property with $120,000 gross income, 5% vacancy, and $40,000 expenses has an NOI of $74,000.
Calculate NOI
Enter gross rental income, vacancy rate, and itemized operating expenses.
Annual Operating Expenses
About This Tool
The NOI Calculator helps real estate investors determine the net operating income of a rental property by accounting for vacancy losses and itemized operating expenses. Net operating income is the cornerstone metric in real estate investing — it drives property valuations, loan underwriting, and investment analysis. This calculator breaks down the calculation step by step so you can see exactly where your money goes.
How NOI Is Calculated
NOI starts with gross rental income — the total rent the property would generate if fully occupied for the entire year. From this, we subtract a vacancy and credit loss allowance to arrive at effective gross income. Then we subtract all operating expenses to get NOI. The formula is: NOI = Gross Income x (1 - Vacancy Rate) - Operating Expenses. This number represents the property's income before any debt service, capital expenditures, or income taxes.
Understanding Vacancy Allowance
Even well-managed properties experience some vacancy. Tenants move out, units need turnover time for cleaning and repairs, and occasionally a unit sits empty for weeks or months between tenants. The vacancy allowance accounts for this lost income. Most investors and lenders use 5-8% for residential properties in stable markets. High-turnover markets or seasonal rentals may warrant 10-15%. Even if your property is currently 100% occupied, projecting some vacancy creates a more conservative and realistic NOI estimate.
Itemized Expense Categories
Breaking expenses into categories helps identify opportunities to reduce costs. Property taxes are often the largest single expense and should be verified annually — errors in assessments are common and worth appealing. Insurance should be shopped every 2-3 years. Maintenance typically runs 1-2% of property value annually. Property management fees are usually 8-10% of collected rent. Utilities depend on what the owner pays versus tenants. Tracking each category separately over time reveals trends and anomalies.
NOI in Property Valuation
NOI is directly used in the income capitalization approach to property valuation. By dividing NOI by the market cap rate, you get an estimated property value: Value = NOI / Cap Rate. This means every dollar of NOI improvement translates to a multiple in property value. At a 7% cap rate, increasing NOI by $5,000 adds approximately $71,400 in property value. This is why experienced investors focus relentlessly on maximizing NOI.
NOI for Loan Underwriting
Lenders use NOI to determine how much they are willing to lend on a property. The key metric is the Debt Service Coverage Ratio (DSCR) = NOI / Annual Debt Service. Most lenders require a DSCR of at least 1.20-1.25, meaning the property's NOI must be 20-25% higher than the annual mortgage payments. A strong NOI not only increases the loan amount available but may also qualify you for better interest rates and terms.