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Net Operating Income (NOI) Calculator

Calculate real estate net operating income from rentable area, annual rent per area, other income, occupancy, vacancy loss, and operating expenses.

Published

NOI
Net operating income
$271,500.00
Potential gross income
$452,000.00
Vacancy loss
$67,500.00
Effective gross income
$384,500.00
Operating expenses
$113,000.00
Expense ratio
29.39%

At 85% occupancy, the property generates $384,500.00 of effective gross income before expenses.

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Net Operating Income (NOI) Calculator

Net operating income, or NOI, is the property-level operating profit used throughout commercial real estate. It measures the income a building produces after ordinary operating expenses but before financing, income taxes, depreciation, amortization, and major capital expenditures. Because it excludes the owner’s loan structure, NOI lets investors compare properties on an asset basis before asking how the purchase is financed.

This calculator follows the calculation exactly. It multiplies area by annual rent per area to get full rental income. It adds other income to get potential gross income. It then calculates vacancy loss from full rental income only, using one minus the occupancy rate. After subtracting vacancy loss, it subtracts property tax, management fees, insurance, maintenance, repairs, and other operating expenses to reach NOI. It also reports effective gross income and an expense ratio.

Formula

Full rental income is:

full rental income=area×annual rent per area\text{full rental income} = \text{area} \times \text{annual rent per area}

Potential gross income is:

potential gross income=full rental income+other income\text{potential gross income} = \text{full rental income} + \text{other income}

Vacancy loss is:

vacancy loss=full rental income×(1−occupancy rate100)\text{vacancy loss} = \text{full rental income} \times \left(1 - \frac{\text{occupancy rate}}{100}\right)

Effective gross income is:

effective gross income=potential gross income−vacancy loss\text{effective gross income} = \text{potential gross income} - \text{vacancy loss}

Operating expenses are:

operating expenses=property tax+management fees+insurance+maintenance+repairs+other operating expenses\text{operating expenses} = \text{property tax} + \text{management fees} + \text{insurance} + \text{maintenance} + \text{repairs} + \text{other operating expenses}

NOI is:

NOI=effective gross income−operating expenses\text{NOI} = \text{effective gross income} - \text{operating expenses}

The expense ratio shown by the calculator is:

expense ratio=operating expenseseffective gross income×100\text{expense ratio} = \frac{\text{operating expenses}}{\text{effective gross income}} \times 100

If effective gross income is zero, the calculator sets the expense ratio to zero to avoid dividing by zero.

Checking a net operating income (noi) scenario

Assume a property has 1,500 square feet, annual rent of $300 per square foot, $2,000 of other income, 85% occupancy, $20,000 of property tax, $14,000 of management fees, $19,500 of insurance, $18,000 of maintenance, $24,500 of repairs, and $17,000 of other operating expenses.

Full rental income is:

full rental income=1,500×$300=$450,000\text{full rental income} = 1{,}500 \times \$300 = \$450{,}000

Potential gross income is:

potential gross income=$450,000+$2,000=$452,000\text{potential gross income} = \$450{,}000 + \$2{,}000 = \$452{,}000

Vacancy loss is:

vacancy loss=$450,000×(1−85100)=$67,500\text{vacancy loss} = \$450{,}000 \times \left(1 - \frac{85}{100}\right) = \$67{,}500

Effective gross income is:

effective gross income=$452,000−$67,500=$384,500\text{effective gross income} = \$452{,}000 - \$67{,}500 = \$384{,}500

Operating expenses are:

$20,000+$14,000+$19,500+$18,000+$24,500+$17,000=$113,000\$20{,}000 + \$14{,}000 + \$19{,}500 + \$18{,}000 + \$24{,}500 + \$17{,}000 = \$113{,}000

NOI is:

NOI=$384,500−$113,000=$271,500\text{NOI} = \$384{,}500 - \$113{,}000 = \$271{,}500

The expense ratio is:

$113,000$384,500×100=29.39%\frac{\$113{,}000}{\$384{,}500} \times 100 = 29.39\%

This example matches the calculator’s default method: vacancy is applied only to full rental income, while other income is added before the vacancy deduction. If your underwriting applies vacancy to other income as well, adjust the input or interpret the result accordingly.

How NOI is used

NOI is the bridge between property operations and valuation. A buyer may divide stabilized NOI by a market capitalization rate to estimate value, which is why even small rent, vacancy, or expense assumptions can move pricing materially. Use the cap rate calculator after calculating NOI to test valuation scenarios. Lenders compare NOI with annual debt service, so the DSCR calculator is the next step for financing analysis. If you are modeling a specific loan, the mortgage calculator and loan calculator can estimate payments.

Asset managers use NOI to diagnose operations. Rising rent can be offset by higher insurance, property tax reassessments, concessions, payroll, repairs, or utilities. A property can show strong potential gross income while still producing weak NOI if occupancy is low or expense control is poor. For hotels and short-term rentals, occupancy and rate drive revenue, so the occupancy rate calculator and ADR calculator can provide inputs before translating performance into NOI.

Caveats and interpretation

NOI is not cash flow after debt. It excludes mortgage principal, mortgage interest, income taxes, depreciation, amortization, distributions, and owner-specific overhead. It also usually excludes major capital improvements such as a new roof, full HVAC replacement, or major renovation, though ordinary repairs and maintenance belong in operating expenses. The boundary between repairs and capital expenditures can affect taxes and accounting, so review the treatment carefully for real underwriting.

Use consistent periods. If rent is annual per square foot, expenses and other income should also be annual. If you have monthly rent, annualize it or use a calculator designed for monthly inputs. Occupancy should represent the same period as the income assumptions. Stabilized NOI may differ from in-place NOI when a property is in lease-up, has expiring concessions, or is undergoing renovation. Always label whether your NOI is actual, trailing twelve months, pro forma, or stabilized.

NOI quality matters as much as NOI size. Contractual rent from credit tenants is usually stronger than speculative pro forma rent, and recurring reimbursements are stronger than one-time fees. Review lease expirations, expense recoveries, concessions, rent abatement, and tax reassessment risk before treating a calculated NOI as durable income.

Common mistakes

  • Including mortgage payments in operating expenses.
  • Applying the occupancy rate to one income stream but comparing with a model that applies it to all income.
  • Mixing monthly expenses with annual rent.
  • Treating capital improvements as ordinary maintenance without checking accounting treatment.
  • Forgetting that property tax, insurance, and repairs can change quickly after acquisition.

Method scope and source version

Jurisdiction-neutral arithmetic; accounting, contractual, market, or institutional conventions may vary. Evergreen method only; defaults/examples must not be represented as current market, legal, tax, or institutional data. The sources below support the stated method and definitions; they do not supply a live rate, quote, legal conclusion, lender offer, or institution-specific policy.

Sources

Frequently asked questions

What does NOI mean?
NOI means net operating income. It measures property-level income after vacancy loss and operating expenses, before mortgage payments, income taxes, depreciation, amortization, owner-specific financing, and major capital expenditures. That makes it useful for comparing assets before financing choices.
How does this calculator calculate vacancy loss?
The calculator multiplies full rental income by one minus the occupancy rate. It applies vacancy loss to rent from area, not to other income, then subtracts the result from potential gross income. This matches the stated calculation method.
Why is NOI important for cap rates?
Cap rates compare NOI with property value. Because NOI excludes financing, it lets investors compare properties before individual debt choices. A small NOI error can materially change value when divided by a market cap rate. Stabilized assumptions should be clearly labeled.
Can NOI be negative?
Yes. NOI is negative when effective gross income is lower than operating expenses. That can happen with low occupancy, high taxes or insurance, unusual repairs, weak rent, or a property still in lease-up. Review whether the issue is temporary or structural.

Related calculators

Cap Rate CalculatorCalculate a real estate capitalization rate from annual net operating income and property value, then compare the result with a 6 percent value check.Rental Property ROI CalculatorEstimate rental property cash flow, NOI, cap rate, cash-on-cash return, sale value, remaining loan balance, and total ROI from purchase and rent assumptions.DSCR Calculator (Debt Service Coverage Ratio)Calculate debt service coverage ratio from monthly income, vacancy, operating expenses, loan amount, rate, and term with lender-style interpretation.Gross Rent Multiplier CalculatorCalculate gross rent multiplier from property price, gross monthly rent, other recurring income, and an optional vacancy allowance for rental screening.Price per Square Meter CalculatorCompare purchase prices, rents, or project quotes by dividing total cost by usable floor area in square meters, with an optional second-property comparison.Realtor Commission with VAT CalculatorEstimate a real estate agent's net commission, VAT on the commission, gross fee, effective fee rate, and seller proceeds before other closing costs.

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