An 8% cap in Memphis signals strong cash flow. The same 8% in San Francisco would signal the building is on fire. Cap rate is the most quoted number in real estate investing and the most frequently misused. Investors throw it around like it means something absolute. It does not. Without context (market, asset class, interest rate environment), a cap rate is just a number with a percent sign.
What is cap rate?
Cap rate (capitalization rate) is what a property yields before financing touches it. Buy a building for cash, collect rent, pay operating expenses, and the percentage you keep relative to the price is the cap rate. No mortgage math, no leverage effects. Just the raw return the asset produces on its own.
Think of it as real estate's equivalent to an earnings yield on a stock. It lets you put a $180,000 triplex in Cleveland and a $1.2M fourplex in San Diego on the same scale, and that comparison reveals more than most investors realize.
NOI is gross rental income minus vacancy, property taxes, insurance, maintenance, management, and other operating costs. It does not subtract mortgage payments, depreciation, or capital expenditures. Keep the inputs clean, and the cap rate stays comparable across deals.
Worked example with the calculator defaults
The calculator above loads with a $350,000 property renting for $2,800/mo with $700/mo in operating expenses and a 5% vacancy allowance. Here is the math:
| Line item | Calculation | Amount |
|---|---|---|
| Gross annual rent | $2,800 × 12 | $33,600 |
| Vacancy loss (5%) | $33,600 × 0.05 | −$1,680 |
| Annual expenses | $700 × 12 | −$8,400 |
| NOI | $33,600 − $1,680 − $8,400 | $23,520 |
A 6.72% cap lands in moderate territory: reasonable cash flow without bleeding-edge yield. Now try this: drop the purchase price slider to $300,000 and watch it jump to 7.84%. Raise expenses to $1,000 and it falls to 5.69%. Small changes compound fast, and the calculator makes them visible instantly.
What counts as a good cap rate?
The honest answer is that "good" depends on what you are buying for. A 4.5% cap in Nashville is not the same bet as a 4.5% cap in a declining small town. One is a growth play with strong fundamentals. The other is a warning sign wearing a suit.
| Cap rate | What it typically signals | Where you see it |
|---|---|---|
| Below 4% | Premium, appreciation-driven. You are paying for the zip code and betting the rent catches up to the price. | San Jose, LA, coastal institutional multifamily |
| 4% – 5.5% | Low yield, moderate growth. Cash flow is thin but the market is adding jobs and population. | Raleigh, Austin, Denver, Nashville |
| 5.5% – 7% | Balanced. Reasonable cash flow, stable fundamentals. The sweet spot for buy-and-hold investors who want both income and a margin of safety. | Columbus, Charlotte, San Antonio, Tampa suburbs |
| 7% – 9% | Strong cash flow, often modest appreciation. Classic buy-and-hold territory where the rent check is the return. | Memphis, Indianapolis, Kansas City, Birmingham |
| Above 9% | High yield, high risk. The market is discounting this property for a reason. Dig into what that reason is before you celebrate. | D-class neighborhoods, small towns, distressed assets |
A useful benchmark: when the cap rate is lower than the interest rate you can borrow at, leverage works against you on a cash-flow basis. That is called negative leverage. It does not kill the deal automatically, but your appreciation thesis had better be airtight, because the property is costing you money every month while you wait for it to come true.
Cap rate vs cash-on-cash vs GRM
Investors mix these up constantly. Each answers a different question, and using the wrong one leads to wrong conclusions.
| Metric | Formula | Includes financing? | Best for |
|---|---|---|---|
| Cap rate | NOI ÷ Price | No | Comparing properties regardless of how you finance them |
| Cash-on-cash | Cash flow ÷ Cash invested | Yes | Measuring your actual return on the dollars you put in |
| GRM | Price ÷ Gross annual rent | No | Quick price-to-rent screening when you lack expense detail |
Here is how they connect on a real deal. Take the $350,000 property with $23,520 NOI (6.72% cap). Finance it with 25% down ($87,500) at 7% on a 30-year note. Annual debt service runs roughly $18,620. Cash flow after debt: $23,520 − $18,620 = $4,900. Cash-on-cash: $4,900 ÷ $87,500 = 5.6%. GRM: $350,000 ÷ $33,600 = 10.4.
Three numbers, three lenses, same property. Cap rate says "decent yield." Cash-on-cash says "modest but positive." GRM says "you are paying about 10 years of gross rent." None of them is wrong. None of them alone is enough.
Cap rates, interest rates, and the 10-year Treasury
Cap rates do not exist in a vacuum. They are tethered to risk-free rates, and the 10-year Treasury is the anchor. The spread between cap rate and Treasury yield is the risk premium investors demand for dealing with tenants, toilets, and roofs instead of clipping coupons.
That spread has historically averaged 150 to 250 basis points for residential investment property. When the 10-year sat at 1.5% in 2021, a 4% cap felt reasonable, at 250 bps of spread. With the 10-year around 4.3% in 2025, a 4% cap means you are earning less than Treasuries for the privilege of owning real estate. The math only works if you are absolutely certain about rent growth.
Watch for the disconnect: when Treasury yields rise and cap rates do not follow, something has to give. Either prices come down (caps expand) or rents go up. In 2022–2023 we saw both: multifamily caps expanded roughly 100 bps in many markets while Sun Belt rents continued climbing, cushioning the blow. If you are buying in a flat-rent market where caps have not adjusted, you are probably overpaying.
When cap rate misleads you
Cap rate is a powerful screening tool with real blind spots. Lean on it too hard and you will make expensive mistakes.
- Value-add properties. A building with 40% vacancy and deferred maintenance might show a 3% cap on current NOI. Meaningless. You are buying for the stabilized number. Calculate the projected NOI after renovations and compare that cap to what stabilized comps trade at. That is the real comparison.
- Vacant or nearly vacant buildings. Zero NOI means a 0% cap. That does not mean the property is worthless. It means cap rate is the wrong tool for this deal right now. Use replacement cost or price-per-unit instead.
- Financing is invisible. Two identical 6% cap properties feel wildly different when one is financed at 5.5% (positive leverage, cash flow amplified) and the other at 7.5% (negative leverage, cash flow crushed). Cap rate cannot tell you this. Run the numbers through a cash-on-cash calculator to see the leveraged picture.
- CapEx gets ignored. A roof replacement in two years is not in the NOI calculation, but it will hit your wallet for $8,000 to $15,000 on a single-family. A suspiciously high cap rate sometimes means the seller has deferred every capital expense possible. You are buying their backlog.
- Single-family quirks. Cap rates were designed for income property with comp transactions. On a single-family rental in a homeowner-dominated neighborhood, the price is set by owner-occupant demand, not investor math. The cap rate will look low, but the appreciation dynamics are completely different, and that might be the whole point.
Cap rate compression and expansion
These two terms come up constantly in market discussions. They describe the same concept from opposite directions, and understanding the cycle is worth more than any single deal analysis.
Compression means cap rates are falling. Prices are rising relative to NOI. It happens when money is cheap, investor demand is high, and buyers accept thinner yields because the alternative is sitting in cash. U.S. multifamily went through a historic compression cycle from 2015 to early 2022: average caps fell from roughly 6% to below 4.5% in markets like Phoenix, Dallas, and Atlanta.
Expansion is the reverse. Rising rates, tighter lending, or a demand pullback forces buyers to demand higher yields, which means prices drop relative to NOI. After the Fed hiked rates in 2022–2023, multifamily caps expanded by 75–150 bps depending on the market. Some Sun Belt markets expanded more. Some gateway cities barely moved.
Here is why this matters to you personally: if you buy at a compressed cap and rates rise, your property value drops even if rent stays flat. That is the hidden risk of buying in a low-cap environment. Conversely, buying during expansion with strong rent growth potential sets you up for a double benefit: rising NOI and compressing caps when the cycle eventually turns. The best acquisitions in history were made during expansion. The worst were made at the bottom of compression.
Using cap rate for property valuation
Most people use the formula forward: NOI divided by price gives the cap rate. But the real power is running it backward.
Say a duplex in Indianapolis produces $28,000 in NOI and similar properties trade at a 7% cap. Implied value: $28,000 ÷ 0.07 = $400,000. If the seller wants $440,000, you are paying a 6.36% cap, about 64 bps tighter than the market. That gap needs a concrete reason: better condition, stronger tenants, demonstrable rent upside.
This is exactly how commercial appraisers value income property. They call it the income approach, and for multifamily and commercial assets it usually carries more weight than comps. Try plugging different price assumptions into the calculator above and watch how the cap shifts. Then ask yourself: what cap is the market actually trading at? If your deal is tighter than market, you need to know why you are paying the premium, and "the seller seems firm" is not a reason.
Cap rate by property type
Different asset classes trade at different caps because the risk profiles are different. A self-storage facility with month-to-month leases is not the same animal as a Class A apartment complex with 12-month leases and a waiting list. The market prices each accordingly.
| Property type | Typical cap range | Why |
|---|---|---|
| Class A multifamily | 4.0% – 5.5% | Institutional demand, stable tenants, low perceived risk |
| Single-family rental | 5.0% – 7.5% | Varies wildly; owner-occupant pricing compresses caps in good neighborhoods |
| Small multifamily (2–4 units) | 5.5% – 8.0% | Management-intensive, fewer institutional buyers, more operator skill required |
| Self-storage | 5.5% – 7.5% | Low OpEx, resilient demand, but month-to-month turnover adds volatility |
| Retail strip centers | 6.5% – 9.0% | Higher risk from tenant turnover and e-commerce headwinds, priced accordingly |
Notice the pattern: the more predictable the income, the lower the cap rate. The market pays a premium for certainty. When you see a 9% cap on a strip center, the market is not being generous. It is telling you something about the risk you are taking.
How to actually use cap rate in your analysis
Here are the practical moves, ordered by impact. Not a generic checklist, but the things that separate investors who use cap rate well from investors who just cite it.
- Rebuild the NOI yourself.Seller-provided NOI is fiction: full occupancy, zero repairs, management fee magically at 0%. Use actual tax and insurance bills. Assume 5–8% vacancy. Include a management fee even if you self-manage, because you will not self-manage forever, and the cap rate should reflect the property's true economics, not your free labor.
- Compare cap to your cost of capital. If your all-in borrowing cost exceeds the cap rate, leverage is working against you. A 5.5% cap financed at 7.25% means every dollar of debt destroys value. You need significant rent growth or appreciation to justify it. Most investors do not have the conviction they think they have.
- Track local cap trends. A 6.5% cap in a market that traded at 7.5% last year means compression, with prices rising. A 6.5% in a market that was 5.5% means expansion, with prices falling. Same cap rate, opposite signals. Direction matters more than the snapshot.
- Use it as a screen, not a verdict. Cap rate narrows your list from 50 properties to 5. Cash-on-cash, DSCR, and a full proforma get you from 5 to the one you make an offer on. Plug your shortlisted deals into the Rental Property Analyzer to see the full picture.
Frequently asked questions
What is a good cap rate for rental property?
There is no universal number, and anyone who gives you one is selling something. A 7.5% cap on a duplex in Memphis means strong cash flow in a stable rental market. A 7.5% cap in Austin means something is wrong with the building. Context is everything. In cash-flow markets like Indianapolis, Birmingham, or Kansas City, 7% to 9% is normal. In growth metros like Raleigh or Denver, 4% to 5.5% is standard because investors are paying for appreciation. Compare cap rates within the same market and property class, not across them.
How do you calculate cap rate?
Divide the annual net operating income by the purchase price. NOI is gross rent minus vacancy, property taxes, insurance, maintenance, and management. It does not include mortgage payments or CapEx. If a property earns $24,000 in NOI on a $350,000 price, the cap rate is 6.86%. The calculator above does this instantly: plug in your numbers and adjust the sliders to see how each variable moves the result.
Does cap rate include mortgage payments?
No, and that is the whole point. Cap rate strips out financing so you can compare a property bought with cash to one bought with 80% leverage on the same scale. If you want to know your return after the mortgage, you need cash-on-cash return. Cap rate tells you what the asset yields. Cash-on-cash tells you what your dollars earn.
Why do cap rates matter for property valuation?
Because the formula works both directions. If you know the NOI and the market cap rate, divide NOI by cap rate to get implied value. A property earning $30,000 NOI in a 6% cap market is worth roughly $500,000. This is not abstract math. It is how commercial appraisers price income property, and serious investors use it to spot overpriced listings fast. If the seller wants $550,000 for a property the market values at $500,000, you need a very good reason to pay that premium.
What is cap rate compression?
Cap rate compression happens when prices rise faster than rents, and investors accept a lower yield, usually because interest rates are low and capital is chasing returns. U.S. multifamily caps compressed from around 6% in 2015 to below 4.5% by early 2022. Then rates spiked and caps expanded again. If you bought at a compressed cap and held, your on-paper value dropped even with flat rent. That is the risk nobody talks about during a compression cycle.
Is a higher cap rate always better?
No. A high cap rate is a risk signal, not a gift. An 11% cap in a declining Rust Belt town usually means tenant quality issues, deferred maintenance, population loss, or all three. The market is not giving you free yield. It is discounting the property for problems you will inherit. A 5% cap in a growing metro with rising rents and job growth is often the better risk-adjusted bet. Pair the cap rate with the risk profile of the market before you celebrate a high number.
How does cap rate differ from cash-on-cash return?
Cap rate ignores financing entirely. Cash-on-cash measures the cash you pocket relative to the cash you put in, after the mortgage payment. A 6% cap property might produce a 9% cash-on-cash if you leverage it at a rate below the cap, or a 3% cash-on-cash if your mortgage rate is higher. Same property, same cap rate, wildly different returns depending on how you finance it. That is why you need both numbers.
Can cap rate change over time on the same property?
Your purchase cap rate is locked at the price you paid, and that never changes. But the cap rate on cost moves as NOI moves. Raise rents by $200/mo across a fourplex and your annual NOI jumps $9,600. On a $400,000 basis, that is a meaningful shift. Smart investors track both: going-in cap to benchmark the acquisition, and cap on cost to measure how well they are operating the asset.