Cap Rate Explained: What It Is, How to Calculate It, and What's a Good Number

If you've spent any time researching real estate investing, you've encountered "cap rate." It comes up in property listings, investment analyses, and conversations between investors constantly. Yet most beginners either don't know what it means or use it incorrectly.

Cap rate is genuinely useful - once you understand exactly what it measures and what it doesn't.

What Is Cap Rate?

Cap rate (short for capitalization rate) measures the return on investment you'd receive if you purchased a property entirely with cash - no mortgage.

It answers the question: "If I paid all cash for this property, what percentage return would I earn annually from the rental income?"

The formula:

Cap Rate = net operating income-real-estate) (NOI) ÷ Property Value × 100

Or equivalently: Cap Rate = NOI ÷ Purchase Price

What Is Net Operating Income (NOI)?

NOI is your total rental income minus all operating expenses - but before deducting mortgage payments or income taxes.

NOI = Gross Rental Income - Operating Expenses

Operating expenses include:

• Property taxes
• Insurance
• Property management fees
• Repairs and maintenance
• CapEx reserves
• Vacancy allowance
• Utilities (if owner-paid)
• HOA fees

NOI does NOT include:

• Mortgage principal and interest
• Income taxes
• Depreciation

This is critical. Cap rate is a property-level metric - it evaluates the asset independent of how you finance it. This is what makes it useful for comparison.

Cap Rate Calculation Example

Property details:

• Purchase price: $200,000
• Monthly rent: $1,600
• Annual gross income: $19,200
• Annual operating expenses: $8,640 (45% of gross income)
• Annual NOI: $10,560

Cap Rate: $10,560 ÷ $200,000 = 5.28%

This property generates a 5.28% return on value - all-cash, before financing.

What Is a Good Cap Rate?

Cap rates are highly market-dependent. What's considered "good" in Memphis, Tennessee is considered terrible in San Francisco.

General ranges:

| Market Type | Typical Cap Rate | |---|---| | Primary markets (NYC, LA, SF, Boston) | 3 - 4% | | Large secondary markets (Chicago, Dallas, Denver) | 4 - 6% | | Mid-tier markets (Columbus, Indianapolis, Memphis) | 6 - 8% | | Tertiary/rural markets | 8 - 12%+ |

The inverse relationship: Higher cap rates typically mean:

• Lower appreciation expectations
• Higher perceived risk
• Less competition from institutional capital
• Potentially more cash flow

Lower cap rates typically mean:

• Higher appreciation expectations
• Prime location, high demand
• Lower cash flow (price is high relative to income)
• More competition, harder to find deals

Cap Rate vs. cash-on-cash return: Know the Difference

This is where beginners get confused. Cap rate ignores financing. Cash-on-cash return (CoC) accounts for it.

Same property, same NOI - different CoC depending on financing:

| Scenario | Purchase Price | NOI | Cap Rate | CoC (w/ financing) | |---|---|---|---|---| | All cash | $200,000 | $10,560 | 5.28% | 5.28% | | 25% down, 7% rate | $200,000 | $10,560 | 5.28% | 2.1% (after debt service) | | subject-to at 3.5% | $200,000 | $10,560 | 5.28% | 8.7% (after lower debt service) |

Cap rate is the same in all three - because cap rate ignores how you pay for it. CoC changes dramatically based on financing.

Use cap rate to: Compare properties and markets. Evaluate a deal relative to other deals. Use CoC return to: Evaluate how a specific deal performs with your specific financing.

Using Cap Rate to Value a Property

Cap rate isn't just a return metric - it can also help you determine what a property is worth.

Value = NOI ÷ Market Cap Rate

If the market cap rate for similar properties in a neighborhood is 7%, and a property has an NOI of $14,000:

Value = $14,000 ÷ 0.07 = $200,000

This is how commercial real estate appraisers value properties and how investors identify over/underpriced deals:

• NOI of $14,000 at a market cap rate of 7% → property worth $200,000
• If listed at $240,000 → implied cap rate is only 5.8% → probably overpriced for this market
• If listed at $165,000 → implied cap rate is 8.5% → potentially underpriced

Practical use: If you can increase a property's NOI (by raising rent, adding laundry income, reducing expenses), you increase its value at the same cap rate. This is forced appreciation - and it's why value-add investors love NOI growth.

Common Cap Rate Mistakes

Using asking rent instead of market rent. If the seller's tenant pays below-market rent, the NOI is artificially low - making the cap rate look worse than it really is. Run your analysis with market rent.

Using "pro forma" NOI uncritically. Sellers sometimes show "projected" NOI based on ideal assumptions. Always verify operating expenses independently.

Forgetting CapEx and vacancy. Many simplified cap rate calculations omit these, inflating the apparent return. Always include them.

Comparing cap rates across different property types. A 6% cap rate on a Class A apartment building is different from a 6% cap rate on a Class C single-family in a high-crime area. Cap rate doesn't capture risk differences - use it as a starting point, not a final answer.

Using cap rate for house hacking or short-term rentals. Cap rate assumes a stabilized, long-term rental. It's less meaningful for properties you'll live in or for STRs with widely fluctuating income.

Quick Cap Rate Reference Guide

Below 4%: Common in expensive coastal markets. Very compressed - typically appreciation-focused. Cash flow is usually minimal.

4 - 6%: Secondary market range. Decent appreciation potential, moderate cash flow. Institutional money competes here.

6 - 8%: Mid-market sweet spot for cash-flow investors. Less competition, reasonable appreciation expectations, workable numbers.

8 - 10%: Higher risk or tertiary markets. Strong cash flow potential if you know the market. More management-intensive.

Above 10%: Proceed with caution. High cap rates often indicate high risk: bad neighborhoods, high vacancy, poor condition, or a market with declining population.

Final Thoughts

Cap rate is a tool, not a verdict. A 7% cap rate in one market is a great deal. A 7% cap rate in another market is average. The number only means something in context.

Use it to compare similar properties in the same market, to value deals based on income, and to track whether a market is getting more or less competitive over time. Combined with cash-on-cash return, cash flow analysis, and your own market knowledge, cap rate becomes a powerful part of your deal-analysis toolkit.

Ready to calculate cap rate on a specific property? Use our free cap rate calculator - enter the purchase price, rent, and expenses, and get your numbers instantly.