Why It Matters
Cap rate is the single most common metric for comparing investment properties on an apples-to-apples basis. Because it strips out financing — no mortgage, no down payment, no loan terms — it isolates the property's own income-generating performance. When an investor says a deal is "at a 6 cap," they mean the property generates 6% of its value in annual net income. It's the starting point for every deal evaluation, though it should never be the ending point.
At a Glance
- Formula: Net Operating Income (NOI) ÷ Property Value × 100
- Multifamily Class A (2025): ~4.7–5.0%
- Multifamily Class B (2025): ~5.0–7.0%
- Industrial (2025): ~6.5–7.5%
- Office Class A (2025): ~8.4% (elevated due to remote work vacancy)
How It Works
The cap rate formula takes a property's annual NOI — gross rental income minus operating expenses like property taxes, insurance, maintenance, and management — and divides it by the property's value.
NOI ÷ Property Value × 100 = Cap Rate %
A $500,000 apartment building generating $35,000 in annual NOI has a 7% cap rate. A $1.2 million retail center generating $72,000 in NOI also has a 6% cap rate. Despite being different asset types in different price ranges, the cap rate tells you both are producing roughly similar returns per dollar of value.
This financing-independent view is why cap rates dominate commercial real estate analysis. When a pension fund evaluates a $50 million office tower and a first-time investor evaluates a $200,000 duplex, both are asking the same question: what does this property yield on its own? Cap rate answers it.
Cap rates also function as a pricing tool. If you know the market cap rate for similar properties is 6.5% and a property generates $45,500 in NOI, you can calculate its implied value: $45,500 ÷ 0.065 = $700,000. This is how commercial appraisers, brokers, and institutional investors price income properties — and why a change of even half a percentage point in cap rates (see cap rate compression and cap rate expansion) can shift property values by hundreds of thousands of dollars.
The catch: cap rate says nothing about your actual return as a leveraged investor. It assumes you're paying all cash. If you finance 80% of a purchase, your actual return on capital invested will be very different — that's where cash-on-cash return takes over. Cap rate tells you about the property. CoC return tells you about your deal.
Real-World Example
Miguel evaluates two rental properties in San Antonio. The first is a fourplex listed at $420,000 generating $3,200/month in gross rent. After deducting $1,120/month in operating expenses (taxes, insurance, maintenance, management), the annual NOI is $24,960.
Cap Rate: $24,960 ÷ $420,000 × 100 = 5.9%
The second property is a small commercial strip center listed at $680,000 generating $5,100/month in gross rent with $1,870/month in operating expenses. Annual NOI: $38,760.
Cap Rate: $38,760 ÷ $680,000 × 100 = 5.7%
Both properties are priced at nearly identical cap rates — roughly 5.8–5.9% — meaning the market values them similarly relative to their income. Miguel can now compare them on other factors: tenant quality, vacancy rate, management complexity, and appreciation potential. The cap rate told him they're in the same ballpark; everything else determines which one gets his capital.
Pros & Cons
- Enables direct comparison across properties, markets, and asset classes regardless of financing
- Industry-standard metric understood by every investor, broker, lender, and appraiser
- Functions both as a return metric (measuring yield) and a valuation tool (pricing properties from NOI)
- Simple to calculate from publicly available data (listing price + income/expense projections)
- Ignores financing entirely — two investors buying the same property with different loans will have very different actual returns
- Static snapshot that doesn't capture future rent growth, appreciation, or capital improvements
- Relies on accurate NOI, which sellers frequently inflate by understating expenses or overstating income
- Less meaningful for single-family rentals where comparable sales (not income) drive pricing
Watch Out
- Seller-provided cap rates are almost always inflated. Sellers understate vacancy, maintenance, and management costs to present a higher NOI. Always recalculate NOI using your own expense assumptions — not the seller's pro forma.
- Low cap rate ≠ bad deal. A 4% cap rate in a Class A market with 3% annual rent growth may outperform a 9% cap rate in a declining market over a 10-year hold. Cap rate is a snapshot, not a forecast.
- Don't use cap rate for flips. Cap rate is designed for income-producing hold investments. A flip generates profit from the buy-renovate-sell spread, not annual income. Use ARV and rehab analysis instead.
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The Takeaway
Cap rate is real estate investing's universal language for comparing income properties. It answers the foundational question: what does this property yield if you strip away everything else? Start every deal analysis here, then layer in cash-on-cash return for your specific financing, IRR for long-term performance, and GRM for quick screening. No single metric tells the whole story, but cap rate is always chapter one.