Cap Rate Calculator
This cap rate calculator gives you the capitalization rate two ways: a quick simple-mode calculation from a known net operating income and property value, or a detailed build-up from gross rent, vacancy rate, and operating expenses when you’re starting from a rent roll instead of a finished income statement. Use whichever mode matches the numbers you already have on hand.
To calculate cap rate, divide a property’s annual net operating income by its current value or purchase price, then multiply by 100: Cap Rate = (NOI ÷ Property Value) × 100. The resulting percentage is an income-to-value measure; interpreting it requires comparable properties, the local market, property type, income quality and the assumptions behind NOI.
The Formula Behind This Cap Rate Calculator
Every cap rate calculation compares two numbers for one property: what it earns in a year, and what it’s worth. The higher the income relative to the value, the higher the resulting cap rate.
Core cap rate formula
The formula is Cap Rate = NOI ÷ Property Value × 100. NOI is net operating income — what the property earns in a year after operating costs, but before financing.
NOI from a rent roll
When you don’t already have a finished NOI figure, build it from NOI = (Gross Rental Income × (1 − Vacancy Rate)) − Operating Expenses. This simplified build-up is useful when you have gross rental income, a vacancy assumption and operating expenses but not a finished NOI figure.
What counts as an operating expense
Operating expenses commonly include items such as property taxes, insurance, maintenance, management and owner-paid utilities. Debt service and depreciation are not property operating expenses for this calculation; capital expenditures are generally treated separately from NOI.
Higher vs. lower cap rate
A higher cap rate means more current NOI relative to the value used in the denominator; a lower cap rate means less. The percentage alone does not establish whether an investment is safer, riskier, better or worse — market, property, lease and income characteristics matter.
What To Compare Before Using The Percentage
There is no universal cap-rate range that makes a property attractive or unattractive. A useful comparison keeps the property type, location, income period and NOI treatment as consistent as possible.
| Comparison factor | Why it matters |
|---|---|
| Property type | Apartments, retail, office, industrial and single-family rentals can have different income, lease and operating characteristics. |
| Local market | Comparable transactions and required returns can vary materially by city, submarket and property quality. |
| NOI period | Trailing, current and stabilized NOI can produce different cap rates for the same property value. |
| Occupancy and leases | Vacancy, lease terms, tenant concentration and unusual concessions can affect whether current NOI is representative. |
| Capital needs | Cap rate does not by itself show future renovation, replacement or other capital requirements. |
Cap Rate Calculation Examples
These are realistic illustrative scenarios using the same formulas as the calculator. They are not actual listings, recommendations, or investment results.
Known NOI and property value
$35,000 ÷ $500,000 × 100 = 7.00%. The result describes current NOI relative to the value entered; it does not by itself determine investment quality.
Build NOI from rental income
$48,000 × 95% = $45,600 effective rental income; $45,600 − $9,000 = $36,600 NOI; $36,600 ÷ $500,000 × 100 = 7.32%.
Where Cap Rate Estimates Go Wrong
A cap rate calculator is only as accurate as the numbers going into it. Here’s what most often throws off the result.
Using gross income instead of NOI
Gross rental income ignores vacancy, taxes, insurance, and management fees. Using gross rental income in place of NOI can materially overstate the cap rate because operating expenses and vacancy are not properly reflected.
Including debt service in NOI
Mortgage payments are a financing cost, not an operating expense. Including them conflates a property’s own performance with how a specific buyer chose to finance it, which defeats the purpose of an unlevered metric.
Comparing cap rates across different property types or markets
A 6% cap rate on a prime urban office building and a 6% cap rate on a secondary-market retail strip don’t carry the same risk. Compare cap rates against similar assets in similar markets, not as one universal scale.
Treating cap rate as your actual investment return
Cap rate is unlevered, so it ignores financing entirely. If you’re buying with a mortgage, your actual cash-on-cash return will differ, sometimes substantially, from the property’s cap rate.
Using a single year’s NOI without checking it’s representative
A property with an unusually vacant or unusually full year can produce a misleading cap rate. For valuation and underwriting, a stabilized NOI may be used when current results are not representative; trailing operating information can also help distinguish ongoing performance from a temporary swing.
Cap Rate Calculator: Frequently Asked Questions
Answers to the questions real estate investors and appraisers ask most often about cap rate, NOI, and how this calculator handles each one.
How do you calculate cap rate?
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What’s a “good” cap rate?
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Why doesn’t cap rate account for my mortgage?
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Should I use current NOI or projected NOI?
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Does a lower cap rate mean a worse investment?
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How is cap rate different from ROI and cash-on-cash return?
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How do I calculate cap rate manually, without a calculator?
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Calculation References
- Commercial Real Estate Lending — Office of the Comptroller of the Currency (OCC)
- Net Operating Income — Fannie Mae Multifamily Guide
- Underwritten Capitalization Rate — Fannie Mae Multifamily Guide
- CalcsDone Methodology
The calculator applies the formulas shown on this page to the values you enter. Source references support the general cap-rate and NOI framework; they do not validate a particular property’s income, value, market assumptions, or investment suitability.
About This Calculator
Umer Farooq is the founder and developer of CalcsDone. This page documents the formula, assumptions, limitations, worked examples and references used by the calculator. It does not claim professional appraisal, investment-advisory, tax, legal or lending credentials. If something looks incorrect, contact CalcsDone so it can be reviewed.
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