Cap Rate Calculator
Finance & InvestmentCalculate the capitalization rate for any rental property. Enter property value, gross rent, vacancy, and annual expenses to instantly see NOI and gross yield.
Reviewed by the thecalcu.com team · Last updated July 3, 2026
Cap Rate
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Cap rate measures return as if the property were purchased in cash — it excludes mortgage financing. Use it to compare properties or markets regardless of how they are funded.
What is a Cap Rate?
A Cap Rate Calculator computes the capitalization rate of an investment property, the ratio of its annual net operating income (NOI) to its current market value, expressed as a percentage. Cap rate is the single most important metric in commercial and residential investment real estate for comparing properties across different markets, financing structures, and deal types.
The capitalization rate formula is straightforward: Cap Rate = NOI / Property Value × 100. What makes it powerful is what it excludes, the mortgage payment. By removing financing from the equation, cap rate measures a property's intrinsic income-generating ability independent of how it is purchased. A property with a $50,000 annual NOI and a $1,000,000 value has a 5% cap rate whether the buyer pays cash, puts 25% down, or finances 90%. This makes it a genuinely comparable metric across deals.
Net operating income is gross annual rent minus vacancy losses, minus all operating expenses except the mortgage. Operating expenses include property taxes, insurance, maintenance, and property management fees. Vacancy loss accounts for periods when the unit is empty or rent is not collected. The result is the actual income the property produces as a business, what it earns, not what it earns after debt payments.
Understanding cap rate is foundational before analyzing any specific deal with leverage. If the cap rate on a property is 5% and your mortgage rate is 7%, financing the deal introduces negative leverage, debt costs more than the property earns, dragging down your cash-on-cash return. If your mortgage rate is 4%, financing amplifies returns positively. For the full leveraged return analysis, use the Rental Property ROI Calculator alongside this tool.
Cap rates also serve as a valuation shorthand. If comparable properties in your market trade at a 6% cap rate and the seller's asking price implies a 4.5% cap rate, you have a data-backed case for a lower offer, or a clear signal to walk away.
Why Use a Cap Rate Calculator?
Instant comparability across properties. When evaluating multiple listings, converting each to its cap rate gives you a single comparable number regardless of different rent levels, expense structures, or asking prices. A property with $3,200/month rent in one city and one with $1,800/month rent in another can be directly compared via their respective cap rates.
Screens out over-priced listings immediately. If a seller's asking price implies a cap rate significantly below comparable market transactions, the property is priced for appreciation that may not materialize. Cap rate arithmetic makes this visible in seconds.
Separates NOI from financing. The calculator computes NOI explicitly, showing you gross rent, effective gross rent (after vacancy), and NOI before arriving at the cap rate. This breakdown often reveals that a deal's appeal depends entirely on unrealistic rent or vacancy assumptions, not the property's fundamentals.
Quick valuation crosscheck. Inverting the formula, Value = NOI ÷ Cap Rate, gives you a rough property valuation based on income. Running the calculation with local market cap rates from comparable sales tells you whether the asking price is in line with income-based valuation.
Who Should Use This Calculator?
Real estate investors screening acquisition targets. Before diving into full financial modeling, cap rate is the first filter. A deal with a cap rate well below your investment threshold can be dismissed quickly; one above it warrants deeper analysis with the full Rental Property ROI Calculator.
Property owners benchmarking against the market. If you own rental property, knowing your current cap rate versus comparable recent sales in your area tells you whether your property is undervalued, overvalued, or fairly priced, relevant for a refinance, sale, or 1031 exchange decision.
Buyers negotiating purchase price. If you know the market cap rate for comparable properties and your target NOI, you can back-calculate the maximum price you should pay. Showing a seller this analysis is a professional approach to price negotiation grounded in income-based valuation.
Commercial lenders and underwriters. Lenders use cap rate as a key underwriting metric for commercial and multi-unit real estate loans. The Debt Service Coverage Ratio (DSCR) depends on NOI, and cap rate provides context for whether a property's income is competitive within its market.
Developers evaluating potential projects. For ground-up development, comparing the projected stabilized cap rate of a completed project against current market cap rates tells you whether the development economics make sense, whether the exit value (based on market cap rates and NOI) exceeds your total development cost.
What Insights Does the Cap Rate Calculator Give You?
Cap Rate is the primary output, the property's annual income yield as a percentage of its value, independent of financing. Use the benchmark panel to contextualize your result: 3–5% is typical for Class A urban properties, 5–7% for suburban residential, 7–10% for high-yield or value-add plays. The color coding (green / blue / amber / red) provides an immediate quality signal.
Net Operating Income (NOI) is the intermediate result that drives the cap rate, it's also the basis for income-approach property valuation and DSCR calculations. If your cap rate is disappointing, checking NOI against your inputs helps diagnose whether the issue is low rent, high expenses, or high vacancy.
Gross Rental Yield shows the cap rate equivalent without deducting vacancy and expenses, gross rent divided by property value. Because it is always higher than cap rate, the spread between gross yield and cap rate reveals the efficiency of the property. A property with a 9% gross yield and a 5% cap rate has very high expenses or vacancy; one with a 7% gross yield and a 6.5% cap rate has lean operations.
Effective Gross Rent shows gross annual rent after vacancy deduction. This is the income actually collected on average, it is the starting point for NOI and the most realistic top-line revenue figure.
Reading all four outputs together gives you a complete income picture: how much rent the property generates (Effective Gross Rent), how much it earns after operating expenses (NOI), and how that compares to its value on a yield basis (Cap Rate) and versus gross rent alone (Gross Yield).
How to use this Cap Rate calculator
Enter the Property Value, use the purchase price for a property you are analyzing, or the current estimated market value for a property you already own. For properties under contract, use the contract price. The cap rate is sensitive to this input, overestimating property value understates the cap rate and makes the deal look weaker than it is.
Enter Gross Annual Rent, the total annual rent if the property were 100% occupied for all 12 months. For a single-family home at $2,500/month, this is $30,000. For multi-unit properties, add all units at full occupancy.
Set the Vacancy Rate, enter your estimated vacancy as a percentage. The calculator deducts this from gross rent to compute effective gross income. Use 5% for a strong rental market, 8–10% for a typical market, or 12–15% for a softer or higher-turnover market.
Enter Annual Operating Expenses, include property taxes, insurance, property management, maintenance and repairs, and any other recurring operating costs. Exclude mortgage payments and depreciation. If you do not have actual figures, a common estimate for single-family homes is 40–50% of effective gross rent (the "50% rule" of thumb).
Read the cap rate and benchmark, compare your result against the US market benchmarks in the results panel. If your cap rate is below market comps, consider whether the asking price can be negotiated down or whether this is a low-yield market where appreciation is the primary return driver.
Show formula & methodology ↓Show less ↑
Formula & Methodology
Effective Gross Rent: Effective Gross Rent = Gross Annual Rent × (1 − Vacancy Rate / 100) Net Operating Income (NOI): NOI = Effective Gross Rent − Annual Operating Expenses Cap Rate: Cap Rate = (NOI / Property Value) × 100 Gross Rental Yield: Gross Yield = (Gross Annual Rent / Property Value) × 100 Property Value from NOI (inverse use): Implied Value = NOI / (Cap Rate / 100) Worked example: Property value: $400,000. Gross annual rent: $30,000 (two units at $1,250/month each). Vacancy rate: 8%. Annual operating expenses: $8,200 (property tax: $4,400 + insurance: $1,800 + maintenance: $1,200 + management 8%: $800). Effective Gross Rent = $30,000 × (1 − 0.08) = $27,600 NOI = $27,600 − $8,200 = $19,400 Cap Rate = ($19,400 / $400,000) × 100 = 4.85% Gross Yield = ($30,000 / $400,000) × 100 = 7.50% At 4.85%, this property falls in the lower range of suburban residential cap rates. At current mortgage rates of ~7%, financing this deal would introduce negative leverage (cap rate below borrowing cost). A buyer seeking positive cash flow would need a larger down payment, a lower purchase price, or higher rents to improve the yield. Key assumption: This calculator computes pre-tax, pre-financing returns. State and local taxes, depreciation deductions, interest expense deductions, and capital gains tax on eventual sale all affect the after-tax return. For a financed deal with full cash flow analysis, use the Rental Property ROI Calculator. Cap rate is the foundation metric, layering leverage and tax effects produces the complete investment picture. For a fuller definition, see our glossary entry on Cap Rate.
Frequently Asked Questions