Evaluate rental property returns. Estimate capitalization rate, net operating income (NOI), cash-on-cash return, and gross rent multiplier for commercial real estate analysis.
Total potential rent collected if fully occupied.
Laundry, parking, storage, or ancillary income streams.
Typical ranges: 5–10% for stabilized properties.
Includes taxes, insurance, management, maintenance, utilities, and reserves.
Use asking price, purchase price, or appraised value to compute cap rate.
Annual mortgage payments (principal + interest). Set to 0 for all-cash deals.
Down payment + closing costs + rehab budget for cash-on-cash calculation.
Enter annual rental income, vacancy, and operating expenses. Provide purchase price or value to compute cap rate and compare investments quickly.
Formula:
Quick answer: cap rate measures property income yield before financing. If a building earns $72,000 NOI on a $1,200,000 purchase, the cap rate is 6%. Investors use that number to compare opportunities in the same market, test whether asking price is reasonable, and decide whether expected return fits their risk profile. This calculator also adds cash-on-cash return and gross rent multiplier so you can connect unlevered valuation with real, debt-adjusted cash performance.
The core formula is:
NOI (net operating income) should include realistic vacancy and operating expenses. It should not subtract mortgage payments, depreciation, or income taxes. This distinction matters because cap rate is designed as a property-level metric, independent of personal financing choices. Two investors can buy the same property with different debt structures and still start from the same cap rate baseline.
Example scenario: gross rent is $180,000, other income is $9,000, vacancy is 8%, and operating expenses are $62,000. Effective gross income is $173,880, so NOI is $111,880. If market value is $1,750,000, cap rate is about 6.39%. Now compare that with a 6.9% mortgage rate. If debt service pushes net cash flow too low, the deal may still be acceptable for long-term appreciation, but weak for immediate cash yield.
Common underwriting mistakes include using pro forma rent that has not been proven, underestimating repairs and turnover, and ignoring local tax reassessment risk after purchase. Another mistake is comparing cap rates across unrelated asset classes or neighborhoods without adjusting for tenant quality, lease duration, and regulatory environment. Cap rate is strongest when used with true local comps and updated operating data.
Practical workflow for acquisition screening: (1) calculate stabilized NOI from trailing statements, (2) compute cap rate at asking price, (3) stress-test vacancy and expense scenarios, (4) evaluate debt impact with cash-on-cash return, and (5) compare with alternative assets such as Treasuries, REITs, and private debt. In 2025-2026, many investors also require wider spread above risk-free yields before taking operational real estate risk.
This calculator is educational, not investment advice. Before deploying capital, confirm leases, maintenance backlog, insurance exposure, legal compliance, and financing terms with licensed professionals.
Learn more about real estate investment analysis and cap rates from these authoritative sources:
Disclaimer: Cap rates are one metric among many. Always conduct thorough due diligence including property inspections, market analysis, and consult with a qualified real estate professional before investing.
A real estate agent told me a duplex had a "great" 5% cap rate. I almost bought it before running the actual numbers. The listing showed $2,400/month in gross rent on a $300,000 property. Sounds solid. But gross rent isn't net operating income — and that distinction is where deals go sideways.
After subtracting property taxes ($4,200/year), insurance ($1,800), maintenance reserves ($2,400), vacancy allowance ($1,440), and property management ($2,304), the actual NOI was $16,656 — not the $28,800 the agent implied by quoting gross rent.
OK, 5.55% isn't terrible. But the agent had been quoting a "cap rate" calculated from gross rent, which would have been 9.6%. That's not a cap rate. That's a fantasy.
Cap rate answers one question: if you bought this property with cash (no mortgage), what annual return would the rental income generate? It's the real estate equivalent of a bond yield — a snapshot of income relative to price.
The formula is simple. The inputs are where people get sloppy.
NOI = gross rental income minus all operating expenses (taxes, insurance, maintenance, vacancy, management). It does not include mortgage payments, capital expenditures, or depreciation. Those are financing and accounting decisions, not property performance metrics.
Property A: a condo in San Francisco. $600,000 purchase price, $27,000 NOI. Cap rate: 4.5%.
Property B: a duplex in Memphis. $150,000 purchase price, $13,500 NOI. Cap rate: 9.0%.
Memphis looks like the obvious winner — double the cap rate. But cap rate doesn't tell the whole story.
| Factor | San Francisco (4.5%) | Memphis (9.0%) |
|---|---|---|
| Purchase price | $600,000 | $150,000 |
| Annual NOI | $27,000 | $13,500 |
| 5-year appreciation (est.) | +$120,000 (20%) | +$15,000 (10%) |
| Vacancy rate | 3% | 8% |
| Tenant quality | High-income professionals | Mixed |
| Management hassle | Low | Higher |
San Francisco's low cap rate reflects high demand, low risk, and strong appreciation potential. Memphis's high cap rate compensates for higher vacancy, more management headaches, and slower appreciation. Neither is objectively "better" — they're different risk-return profiles.
Low cap rate = expensive market, lower income yield, but usually safer and appreciating. High cap rate = cheaper market, higher income yield, but more risk and less appreciation. The cap rate is a thermometer, not a verdict.
Cap rate assumes you paid cash. Most investors don't. Cash-on-cash return measures your actual return on the money you put in — the down payment plus closing costs.
Buy that Memphis duplex for $150,000 with 25% down ($37,500). Your mortgage payment is about $750/month. NOI is $13,500/year ($1,125/month). After the mortgage, your cash flow is $375/month or $4,500/year.
The cap rate was 9%. Your cash-on-cash return is 12% because leverage amplifies returns (and risk). This is why real estate investors obsess over financing terms — the mortgage math changes everything.
It depends entirely on the market and property type. As of 2025:
3-5%
Class A / prime markets (SF, NYC, LA). Low risk, high appreciation.
5-8%
Class B / secondary markets. Balanced risk-return.
8-12%
Class C / tertiary markets. Higher yield, higher risk.
A 10% cap rate in San Francisco would signal something is very wrong with the property. A 4% cap rate in rural Mississippi would signal you're overpaying. Context is everything. Compare cap rates within the same market and property type, not across them.
The percentage change in cap rates over time also tells a story — falling cap rates mean prices are rising faster than rents (market heating up), and rising cap rates mean the opposite.
It depends on the market. In expensive coastal cities, 4-5% is typical. In the Midwest or South, 7-10% is common. Compare cap rates within the same market and property class. A "good" cap rate is one that compensates you fairly for the risk of that specific property in that specific location.
No. Cap rate uses NOI (net operating income), which excludes mortgage payments, capital expenditures, and depreciation. It measures the property's income performance independent of how you financed it. For your actual return with a mortgage, use cash-on-cash return instead.
Cap rate measures annual income yield on the property's total value (assuming cash purchase). ROI measures total return including appreciation, tax benefits, and mortgage paydown over your entire holding period. Cap rate is a snapshot; ROI is the full movie. Both are useful, but they answer different questions.
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