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.
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.
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%
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.
Frequently asked questions
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.