Metrics & Formulas8 min read

What Is Cap Rate? A Beginner's Guide

Cap rate (capitalization rate) is one of the most important metrics in real estate investing. Learn what it means, how to calculate it, and how to use it to evaluate deals.

Cap rate (short for capitalization rate) is one of the first numbers every real estate investor should know. It tells you, as a percentage, how much annual income a property generates relative to its value. Put simply, it answers the question: “If I paid all cash for this property, what return would I earn each year from operations alone?”

Cap rate is widely used because it strips out financing. There's no mortgage, no down payment in the equation, so you can compare properties fairly regardless of how they might be financed.

The Cap Rate Formula

The formula is straightforward:

Cap Rate = Net Operating Income (NOI) ÷ Property Value × 100

Example: A property has an NOI of $18,000/year and is listed at $250,000. Cap rate = $18,000 ÷ $250,000 = 7.2%.

NOI is the annual income after subtracting all operating expenses (taxes, insurance, maintenance, management fees, vacancy allowance) but before mortgage payments or depreciation. We cover NOI in detail in What Is NOI?

What Cap Rate Actually Tells You

A higher cap rate means more income relative to the purchase price, but it often reflects higher risk. Markets with strong demand and low vacancy (like dense urban areas) tend to trade at lower cap rates, because investors accept less yield in exchange for stability. Secondary or tertiary markets with more uncertainty tend to trade at higher cap rates to compensate for that risk.

Think of cap rate like an inverse P/E ratio in stocks: a lower cap rate means you're paying more for each dollar of income. A 5% cap rate means you're paying 20× the NOI; an 8% cap rate means you're paying 12.5× the NOI.

Cap Rate vs. Cash-on-Cash Return

Cap rate and cash-on-cash return are both expressed as percentages, but they measure different things:

Cap rate ignores financing entirely. It tells you the return as if you bought the property outright.
Cash-on-cash return accounts for your actual mortgage payments and measures return on the cash you invested (down payment + closing costs).

A deal with a 7% cap rate might have a 9% cash-on-cash return if mortgage interest rates are low (leverage amplifies returns), or a 4% CoC return if rates are high.

Limitations of Cap Rate

Cap rate is a snapshot metric. It does not capture:

Appreciation over time
How leverage affects your actual returns
Long-term IRR, which factors in your exit value
Cash flow under your specific financing terms

For a complete picture, pair cap rate with cash-on-cash return, IRR, and a full cash flow projection. Our step-by-step analysis guide walks through all of them together.

Calculate Cap Rate Instantly with the Analyzer

The Real-Estate Analyzer calculates cap rate automatically as you enter your deal details. Enter the purchase price, rental income, and expenses, and cap rate updates in real time along with every other key metric. No formulas, no spreadsheet required.

Key Takeaways

1Cap rate = NOI ÷ Property Value. It measures annual yield as if you paid all cash.
2Higher cap rates often mean higher risk or weaker markets; lower cap rates signal stability and strong demand.
3Cap rate ignores financing. Use cash-on-cash return to measure the return on your actual invested cash.
4Always pair cap rate with cash flow, IRR, and a stress test for a complete investment picture.

Ready to run these numbers on a real deal?

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