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Real Estate Investor Toolkit

Cap Rate Calculator

Compute cap rate — capitalization rate, defined as NOI (Net Operating Income) divided by property value — reverse it to a direct-cap valuation, and contrast against the band-of-investment derivation (a 'fair' cap rate computed from underlying debt + equity costs). Cited to Damodaran NYU Stern, NCREIF (National Council of Real Estate Investment Fiduciaries), Fannie Mae Selling Guide §B6.

Income
Operating expenses ($/yr)

NOI excludes debt service, depreciation, CapEx, and income taxes by definition.

Property + valuation
Band-of-investment derivation (fair cap rate from debt + equity cost)
Cap rate
6.68%

NOI $33,400 on property value $500,000

Observed cap rate of 6.68% is 1.96% below the band-of-investment derived rate. The market is pricing in rent growth or future rate falls — confirm the assumption is defensible (NCREIF historical benchmarks; market-specific rent-growth comp set). Cap-rate compression cycles can reverse violently.

Direct-cap valuation
$477,143
At 7% target
Band-of-investment
8.64%
Derived "fair" cap rate
NOI breakdown
Gross potential rent
$60,000
Vacancy loss
$4,200
Effective gross income
$55,800
Total operating expenses
$22,400
NOI
$33,400
Expense ratio
40.1%
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View the TypeScript implementation on GitHub: packages/calc/src/cap-rate.ts · view tests

What this means

Cap rate is the unlevered annual return — what you'd earn buying the property all-cash. It strips out the financing decision (cap rate is unlevered) and the buyer-specific tax position (NOI is pre-tax, pre-depreciation), giving a cleaner apples-to-apples comparison than IRR or cash-on-cash would.

The band-of-investment derivation reveals whether the market's observed cap rate is consistent with underlying debt + equity costs. When observed cap is well below the derived rate, the market is pricing in rent growth or future rate falls — confirm the assumption is defensible. When observed cap is well above the derived rate, either the market is pricing in distress / a risk premium, or the deal is mispriced.

Worked example

$500K property, $60K gross rent, 7% vacancy, $22.4K total operating expenses produces NOI of $33,400 and a cap rate of 6.68%. The band-of-investment at 70% LTV / 7% interest / 25-year amortization / 9% equity yield derives a fair cap of 8.65%. The observed cap is 1.97% below the band-of-investment rate — the market is pricing in rent growth (or investors are accepting lower yield for a stabilized asset). Verify the rent-growth assumption against NCREIF + local comp data before committing.

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Frequently asked questions

See the income-property methodology — cap rate, NOI mechanics, band-of-investment derivation, DSCR thresholds with primary-source citations.

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Founder & Editor, Bedrocka Tools

The information and tools on this website are for general educational purposes only and do not constitute financial, investment, legal, or tax advice. Consult a licensed professional for decisions specific to your situation.