NOI Calculator - Free Online Tool

Calculate Net Operating Income for any rental or commercial property

Net Operating Income (NOI) is the single most important metric in real estate investing. Whether you own a single-family rental, a small multifamily building, or a large commercial property, NOI tells you how much income your property generates after paying all operating expenses — before debt service, depreciation, and income taxes. Lenders use it to underwrite loans, appraisers use it to determine value, and investors use it to compare opportunities side by side. This free NOI Calculator covers the full spectrum of real estate analysis. Enter your gross rental income, other income sources, vacancy rate, and all itemized operating expenses — property taxes, insurance, property management, maintenance, utilities, HOA fees, landscaping, advertising, legal/accounting costs, and any other recurring costs. The calculator instantly computes your Effective Gross Income (EGI), Total Operating Expenses, Annual NOI, Monthly NOI, and Operating Expense Ratio. Beyond the basics, our tool goes further than most competitors. Enter your property's purchase price to see the implied cap rate — the market's shorthand for property yield. Enter the number of units to calculate per-unit NOI, essential for comparing multifamily deals. Enter the square footage to get per-square-foot NOI, a key metric in commercial real estate. The sensitivity analysis chart shows how NOI shifts across a range of vacancy rates from 3% to 15%, so you can stress-test your deal assumptions before you commit. The 5-year NOI projection models how rising operating expenses (inflation, maintenance creep) could erode your returns over time. And the reverse calculator answers the question every investor asks: 'What rent do I need to hit my target NOI?' — giving you a concrete rent target to work toward. Properly distinguishing what belongs in NOI is critical. NOI excludes mortgage payments (debt service), capital expenditures (CapEx), depreciation, and income taxes. These are financing and accounting items, not operating expenses. Including them would make properties with different financing structures incomparable. A property's NOI should be the same whether it is owned free-and-clear or carries a mortgage — it reflects the property's operating performance, not the owner's financing choices. For residential rentals, the Operating Expense Ratio (OER) — total operating expenses divided by effective gross income — is a useful health indicator. A ratio below 35% signals a lean, well-managed property. Ratios between 35–45% are typical for professionally managed properties. Ratios above 55% often indicate either high local taxes and insurance, deferred maintenance, or below-market rents that need adjustment. Investors commonly use NOI to calculate the cap rate by dividing NOI by the property's market value or purchase price. A higher cap rate generally means higher yield but also higher perceived risk. Cap rates vary significantly by market, property type, and condition — always compare against local comparable sales for context. Whether you are analyzing your first rental property or your fiftieth, this NOI Calculator gives you the detailed breakdown and scenario modeling you need to make confident, data-driven investment decisions.

Understanding Net Operating Income

What Is Net Operating Income (NOI)?

Net Operating Income is the annual income generated by an income-producing property after deducting all operating expenses but before deducting mortgage payments, capital expenditures, depreciation, and income taxes. It is calculated as Effective Gross Income minus Total Operating Expenses. NOI is the foundational metric for evaluating real estate investment performance and is used universally by investors, lenders, and appraisers to determine a property's value and yield.

How Is NOI Calculated?

The NOI formula has three steps. First, add gross rental income and other income (parking, laundry, storage, late fees) to get Gross Operating Income. Second, subtract vacancy and credit loss — typically calculated as a percentage of gross income — to get Effective Gross Income (EGI). Third, subtract all operating expenses (taxes, insurance, management, maintenance, utilities, HOA, landscaping, advertising, legal/accounting, and miscellaneous) from EGI to arrive at NOI. Crucially, NOI does NOT subtract mortgage payments, depreciation, CapEx, or income taxes.

Why Does NOI Matter for Real Estate Investors?

NOI is the basis for multiple critical metrics. Divide NOI by the property's value to get the cap rate — the market's yield indicator. Lenders use Debt Service Coverage Ratio (DSCR = NOI / Annual Debt Service) to qualify loans; most require 1.20 or higher. Higher NOI supports higher property valuations. It also enables apples-to-apples comparisons between properties with different financing structures. Improving NOI — by increasing rents, reducing vacancy, adding ancillary income, or cutting expenses — directly increases property value.

Limitations and What NOI Doesn't Tell You

NOI does not account for capital expenditures (roof, HVAC, major repairs), which can significantly impact cash flow in older properties. It excludes debt service, so a high-NOI property with heavy leverage might still produce negative cash flow. NOI is based on projections and assumptions that may differ from actual performance. Vacancy rates vary by market cycle. Management costs can fluctuate. For a complete picture, pair NOI analysis with cash-on-cash return, internal rate of return (IRR), and a detailed CapEx reserve schedule.

Formulas

Effective Gross Income (EGI)

EGI = (Gross Rental Income + Other Income) × (1 − Vacancy Rate)

EGI represents the income actually collected after accounting for vacant units and credit losses.

Ingreso Operativo Neto (NOI)

NOI = EGI − Total Operating Expenses

Total Operating Expenses include taxes, insurance, management, maintenance, utilities, and all other recurring costs — but NOT mortgage payments, CapEx, or depreciation.

Operating Expense Ratio (OER)

OER = Total Operating Expenses ÷ EGI × 100

OER measures what percentage of effective gross income is consumed by operating expenses. Below 35% is strong; above 55% is a warning sign.

Cap Rate

Cap Rate = NOI ÷ Property Value × 100

Cap rate expresses the property's annual return as a percentage of its market value, independent of financing.

Required Rent (Reverse Calc)

Required Monthly Rent = (Target NOI + Total Expenses) ÷ [(1 − Vacancy Rate) × 12]

Determines the minimum monthly rent needed to achieve a target NOI given current expenses and vacancy assumptions.

NOI Health Reference

Operating Expense Ratio Benchmarks

Residential rental property benchmarks for Operating Expense Ratio (OER)

OER Range	Clasificación	Interpretación
< 35%	Strong	Low expense burden; excellent NOI margin; well-optimized property
35% – 45%	Moderado	Typical for professionally managed properties; healthy performance
45% – 55%	Aceptable	Average performance; room to optimize expenses or increase rents
> 55%	Weak	High expense burden; investigate cost categories and rent levels

Typical Cap Rate Ranges by Property Type

General cap rate benchmarks — always compare to local market comps

Property Type	Typical Cap Rate Range
Single-Family Rental	4% – 8%
Small Multifamily (2-4 units)	5% – 9%
Large Multifamily (5+ units)	4% – 7%
Retail / Strip Mall	5% – 8%
Office	5% – 9%
Industrial / Warehouse	4% – 7%

NOI Calculation Examples

Single-Family Rental Home

A 3-bedroom rental home generates $2,000/month in rent. Vacancy rate 6%. Annual expenses: taxes $3,600, insurance $1,200, management (8%), maintenance $1,500, utilities $0.

Gross Rental Income = $2,000 × 12 = $24,000/year

Vacancy Loss = $24,000 × 6% = $1,440

EGI = $24,000 − $1,440 = $22,560

Property Management (8%) = $22,560 × 0.08 = $1,805

Total Expenses = $3,600 + $1,200 + $1,805 + $1,500 = $8,105

NOI = $22,560 − $8,105 = $14,455/year

OER = $8,105 / $22,560 = 35.9% (Moderate)

Annual NOI: $14,455 | Monthly NOI: $1,205 | OER: 35.9%

4-Unit Multifamily Building

A 4-unit building generates $4,800/month total rent plus $200/month laundry. Vacancy 7%. Annual expenses: taxes $8,000, insurance $2,400, management (10%), maintenance $3,200, utilities $1,200.

Gross Income = ($4,800 + $200) × 12 = $60,000/year

Vacancy Loss = $60,000 × 7% = $4,200

EGI = $60,000 − $4,200 = $55,800

Management (10%) = $55,800 × 0.10 = $5,580

Total Expenses = $8,000 + $2,400 + $5,580 + $3,200 + $1,200 = $20,380

NOI = $55,800 − $20,380 = $35,420/year

Per-Unit NOI = $35,420 / 4 = $8,855/unit/year

Annual NOI: $35,420 | Monthly NOI: $2,952 | OER: 36.5% | Per-Unit NOI: $8,855

How to Use the NOI Calculator

Choose Annual or Monthly Input Mode

Select whether you want to enter income and expense figures on an annual or monthly basis using the toggle at the top of the form. The calculator automatically converts monthly inputs to annual figures for NOI calculation.

Enter Income and Vacancy

Input your gross rental income, any other income sources (parking, laundry, storage), and your expected vacancy rate. A vacancy rate of 5–8% is typical for most residential markets; adjust based on your local conditions and property history.

Enter All Operating Expenses

Fill in all recurring operating expenses including property taxes, insurance, property management fees, maintenance, and utilities. Use the 'More Expenses' section for HOA fees, landscaping, advertising, and legal costs. The property management field supports both percentage-of-income and fixed dollar amount modes.

Review NOI, Charts, and Projections

Your Annual NOI, Monthly NOI, and Operating Expense Ratio appear instantly. Scroll through the income breakdown donut chart, expense bar chart, vacancy sensitivity analysis, and 5-year projection to assess your investment's performance. Enter a property value to see the cap rate, or use the Reverse Calculator to find what rent you need to hit a target NOI.

Preguntas Frecuentes

What is included in NOI operating expenses?

Operating expenses included in NOI calculation are: property taxes, insurance, property management fees, maintenance and repairs, owner-paid utilities, HOA or condo fees, landscaping and snow removal, advertising and marketing, legal and accounting fees, and miscellaneous recurring costs. NOI does NOT include mortgage payments (debt service), capital expenditures (CapEx like roof replacement or HVAC), depreciation, or income taxes. These are excluded because they vary based on financing and tax situations, making properties incomparable if included.

What is a good NOI for a rental property?

There is no single 'good' NOI figure since it depends on property size, market, and price. Instead, focus on the Operating Expense Ratio (OER) and cap rate. An OER below 35% indicates strong operating efficiency. A cap rate of 5–8% is typical for many residential rental markets, though lower cap rates may be acceptable in high-appreciation markets. Compare your NOI-derived cap rate against recent comparable sales in your specific market to gauge whether the property is priced fairly.

What is the difference between NOI and cash flow?

NOI is the property's income before debt service, CapEx, depreciation, and taxes. Cash flow is what actually ends up in your pocket after paying the mortgage and setting aside CapEx reserves. A property can have positive NOI but negative cash flow if the mortgage payments exceed the NOI. The gap between NOI and cash flow depends entirely on your financing terms. This is why lenders use Debt Service Coverage Ratio (DSCR = NOI / Annual Debt Service) — a DSCR above 1.0 means NOI covers the mortgage; most lenders require at least 1.20–1.25.

How do I use NOI to calculate cap rate?

Cap rate equals NOI divided by the property's current market value or purchase price, expressed as a percentage. For example, if a property generates $30,000 in annual NOI and is priced at $400,000, the cap rate is 7.5%. This calculator computes cap rate automatically if you enter the property value. Cap rate is useful for comparing properties and for valuing commercial real estate using the income approach: Value = NOI / Cap Rate. A higher cap rate means more income per dollar invested but may also signal higher risk or a less desirable location.

What vacancy rate should I use in my NOI calculation?

Use a vacancy rate that reflects realistic expectations for your property and market. For stabilized residential rentals in most US markets, 5–8% is a common assumption. Class A properties in tight urban markets may experience 2–5% vacancy, while older or rural properties may see 10–15%. Check local market vacancy reports from real estate associations or property management companies. For new or recently repositioned properties, use a higher initial vacancy rate (10–15%) during the lease-up period and then a stabilized rate going forward.

Should I include mortgage payments in NOI?

No. Mortgage payments (principal and interest) are never included in the NOI calculation. NOI measures a property's operating performance independent of how it is financed. Two identical properties — one owned free-and-clear and one with a large mortgage — should have exactly the same NOI. Debt service is accounted for separately when calculating cash flow, DSCR, or equity returns. Mixing debt service into NOI would make properties with different financing structures impossible to compare fairly, which is why the real estate industry universally excludes it from the NOI formula.