How to use this cap rate calculator
Choose the detailed path when you have rent and expense records. Choose the quick path when a reliable annual NOI has already been prepared.
- Choose a property-value basis
Enter the current market value when measuring the yield at today's value, or enter a proposed purchase price when screening an acquisition. Record which basis and valuation date you used.
- Annualize recurring property income
Enter one typical month's scheduled rent and other recurring property income. The calculator multiplies those monthly amounts by 12, then subtracts the entered vacancy and credit-loss percentage.
- Enter operating expenses on one period
Use either annual or monthly amounts for every expense field. The period switch converts the visible numbers so the underlying annual total stays unchanged instead of silently changing the scenario.
- Reconcile NOI before reading the percentage
Confirm potential gross income, vacancy loss, effective gross income, annual operating expenses, and annual NOI. The final percentage is annual NOI divided by the entered property value.
What belongs in NOI—and what stays outside it
A cap rate is only comparable when each property uses a consistently defined, sustainable NOI. Tax-return categories and investment-analysis NOI are related but not automatically identical.
Usually included in NOI
Collected or supportable rent, recurring parking or laundry income, vacancy and credit loss, property tax, property insurance, management and leasing costs, routine repairs, owner-paid utilities, association fees, and other recurring property operations.
Usually excluded from NOI
Mortgage principal and interest, loan fees, owner income tax, depreciation, appreciation, sale proceeds, and owner-specific financing choices. Large one-time capital projects should be modeled separately or through a clearly documented reserve convention.
Worked example: from monthly rent to a 7.20% cap rate
Suppose a property is valued at $500,000, produces $5,000 of effective gross income per month, and has $2,000 of operating expenses per month. Annual gross income is $60,000 and annual operating expenses are $24,000, leaving $36,000 of annual NOI. The calculation is $36,000 ÷ $500,000 × 100 = 7.20%. If the same NOI were paired with a $550,000 value, the cap rate would fall to about 6.55%; at $450,000 it would rise to 8.00%.
When starting from scheduled rather than already-effective income, subtract vacancy and credit loss before expenses. For example, $5,000 of scheduled monthly income with a 5% vacancy allowance becomes $57,000 of annual effective gross income, not $60,000. State whether your source figure is potential or effective income so another reviewer can reproduce the numerator.
How to interpret a cap rate without calling one number universally good
There is no universally good cap rate. A higher percentage can reflect more income for the entered value, but it can also reflect weaker location, deferred maintenance, volatile tenants, short leases, lower expected growth, or an unrealistically optimistic NOI. A lower percentage can accompany durable leases, stronger locations, newer condition, or higher expected appreciation, none of which the formula measures. Compare similar property types in the same market and time period, then investigate why the ratios differ.
The value-to-NOI multiple is the reciprocal view of the same relationship. A 5% cap rate corresponds to 20 times annual NOI; an 8% cap rate corresponds to 12.5 times annual NOI. It is not a guaranteed payback period because NOI can change, the property may require capital work, and the eventual sale value is not part of the simple ratio.
Cap rate versus cash-on-cash return and ROI
Cap rate
Annual NOI divided by property value. It intentionally ignores the buyer's loan, down payment, and income tax so the property's operating yield can be compared on an unlevered basis.
Cash-on-cash return
Annual pre-tax cash flow after debt service divided by cash invested. It changes with down payment, interest rate, amortization, fees, and other investor-specific financing choices.
Broader investment return
May include cash flow, principal paydown, capital expenditures, appreciation, sale costs, taxes, and timing. A multi-period measure such as IRR answers a different question from a one-period cap rate.
Common cap-rate mistakes to check before comparing properties
Keep a short audit trail beside every scenario. These checks prevent a polished percentage from hiding inconsistent assumptions.
- Mixing monthly income with annual expenses, or annualizing one category twice.
- Using scheduled rent at full occupancy while ignoring vacancy, concessions, or collection loss.
- Subtracting mortgage payments in one property's NOI but not another's.
- Using an old purchase price for one property and a current market value for another without labeling the difference.
- Omitting recurring management, insurance, tax, maintenance, utility, association, or leasing costs.
- Treating a one-month repair lull or one-time expense spike as a stabilized annual pattern.
- Calling a higher cap rate safer or better without examining lease, location, condition, tenant, and market risks.
Sensitivity checks and limits of the result
Run downside cases for lower collected rent, higher vacancy, an insurance renewal, property-tax reassessment, deferred repairs, and a different market value. The result panel's price sensitivity changes only the denominator; it is not a forecast. A real downturn may change income, expenses, and value together. Preserve source leases, expense records, the valuation date, and every normalization decision so another reviewer can reproduce the scenario.
Use the Home Loan Affordability Calculator to explore a residential payment or the Lenders Calculator for a hard-money scenario, but keep those financing payments outside standard cap rate. If an eventual disposition matters, use the Home Sale Calculator to model liens, selling costs, and seller cash separately rather than adding hypothetical proceeds to NOI. The OCC commercial-real-estate handbook treats income-property lending as a broader discipline involving collateral, borrower capacity, market, and structure. This calculator does not establish market value, complete underwriting, forecast appreciation, or determine legal or tax results.