Cap Rate Calculator

What Is Cap Rate?

The capitalization rate — commonly referred to as "cap rate" — is a fundamental metric in real estate investing that expresses the relationship between a property's net operating income and its market value. It answers a straightforward question: if you purchased this property outright with cash, what annual percentage return would the property's income generate?

Cap rate serves as a quick, standardized way to compare investment properties regardless of their size, price, or location. A single-family rental generating $12,000 in annual NOI on a $200,000 purchase and a commercial building producing $120,000 NOI on a $2 million valuation both have a 6% cap rate — making them directly comparable from a yield perspective.

Real estate investors, appraisers, and lenders all use cap rate as a baseline valuation tool. It is especially useful during the initial screening phase of property analysis because it requires only two data points: NOI and property value. Unlike cash-on-cash return or internal rate of return (IRR), cap rate deliberately excludes financing — it measures the property's inherent income-producing ability independent of how you fund the purchase.

That said, cap rate has limitations. It does not account for mortgage payments, future appreciation, tax benefits, or capital expenditures. Think of it as a snapshot of current income yield, not a comprehensive investment analysis. Serious investors use cap rate alongside other metrics — and that is exactly what RentFolio is designed to help you track.

Cap Rate Formula

Net Operating Income (NOI) is your property's total annual income minus all operating expenses. Income includes rent, parking fees, laundry revenue, and any other recurring property income. Operating expenses include property taxes, insurance, property management fees, maintenance, repairs, utilities paid by the owner, HOA dues, and vacancy allowance. NOI does not subtract mortgage principal and interest, capital expenditures, or income taxes — those are financing and tax decisions, not operating costs.

Property Value can be either the purchase price (if you are evaluating a deal) or the current market value (if you are assessing a property you already own). Which one you use depends on the question you are asking: "What yield am I getting on my original investment?" versus "What yield is this property producing at today's valuation?"

Example Calculation

Suppose you own a duplex that generates $2,400 per month in gross rent ($28,800 annually). Your annual operating expenses total $10,800 — covering property taxes ($3,600), insurance ($1,800), property management ($2,880), maintenance ($1,500), and a 3.5% vacancy allowance ($1,020). Your NOI is $28,800 - $10,800 = $18,000. If the property is worth $270,000:

What Is a Good Cap Rate?

There is no single "good" cap rate — the right number depends on your investment strategy, the local market, property class, and your risk tolerance. However, most residential rental properties in the United States fall within the 4% to 10% range, and understanding where a property sits within that spectrum tells you a great deal about its risk-return profile.

Below 4% — Low Yield, Lower Risk

Cap rates below 4% are typical in high-demand, high-appreciation markets like San Francisco, New York City, and coastal Southern California. Investors buying at these cap rates are generally prioritizing long-term appreciation and wealth preservation over current cash flow. These properties tend to be in prime locations with stable tenants and low vacancy risk, but the thin income margin means any unexpected expense or vacancy can quickly eliminate profits.

4% to 7% — Moderate, Balanced

This is the most common range for residential rental properties in stable suburban and mid-tier urban markets. A cap rate in this range typically indicates a property that produces meaningful cash flow while still being located in an area with reasonable appreciation potential. Many financial advisors and experienced investors consider this range the "sweet spot" for buy-and-hold rental property investing.

7% to 10% — Strong Yield

Cap rates in this range suggest strong income relative to the property's value. You will often find these in secondary and tertiary markets, in neighborhoods with lower property values, or on value-add properties where the seller has not optimized rents. Properties here can generate excellent cash flow, but investors should evaluate tenant quality, neighborhood trajectory, and deferred maintenance carefully.

Above 10% — High Yield, Higher Risk

Cap rates above 10% can signal exceptional returns — or hidden risk. These properties may be in economically distressed areas, have significant deferred maintenance, face high vacancy rates, or be priced low due to problem tenants. Experienced investors can find genuine opportunities here, but thorough due diligence is essential. If a deal looks too good to be true, investigate why the market is pricing it that way.

Cap Rate vs. Cash-on-Cash Return

Cap rate and cash-on-cash return are both expressed as percentages, but they measure fundamentally different things. Cap rate ignores financing entirely — it assumes an all-cash purchase and measures the property's raw income yield. Cash-on-cash return, on the other hand, measures the annual pre-tax cash flow you actually receive relative to the total cash you personally invested (down payment, closing costs, and any initial rehab costs).

Because most investors use mortgage financing, cash-on-cash return is often more relevant to their actual experience. Leverage can amplify returns: a property with a 7% cap rate might produce a 12% or higher cash-on-cash return when purchased with favorable financing. Conversely, high-interest debt on a low-cap-rate property could result in negative cash-on-cash returns even though the cap rate looks acceptable.

Use cap rate to compare properties on a level playing field. Use cash-on-cash return to evaluate how a specific deal performs with your particular financing terms. Smart investors look at both.

How to Use Cap Rate in Your Investment Analysis

Cap rate is most valuable as a screening and comparison tool rather than a final decision metric. Here is how experienced investors integrate cap rate into their workflow:

• Set a target cap rate range based on your market and strategy. If you are investing in a mid-tier Midwest market for cash flow, you might screen for properties at 7% or above. If you are buying in a growth market for appreciation, 4-5% might be acceptable.
• Compare properties within the same market. Cap rates vary significantly between cities and neighborhoods. A 6% cap rate in Austin is a different proposition than a 6% cap rate in Cleveland. Always compare apples to apples.
• Verify the NOI independently. Seller-provided NOI figures are frequently optimistic. They may understate expenses, overstate occupancy, or exclude management fees (because the seller self-manages). Always reconstruct the NOI using your own expense estimates.
• Use cap rate to estimate value. If you know the market cap rate for similar properties and you know the NOI, you can back into the property's fair market value: Value = NOI / Cap Rate. This is how commercial appraisers often work.
• Track cap rate over time. As you collect actual income and expense data in a tool like RentFolio, your real cap rate will differ from your initial estimate. Tracking it year over year shows whether your property's returns are improving or declining — and whether the broader market is compressing or expanding.

Cap rate gives you the starting point. Pair it with cash-on-cash return, debt service coverage ratio, and a realistic pro forma projection to make fully informed investment decisions.