Cap Rate Calculator

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Cap rate

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What is Cap Rate?

The capitalization rate calculator compares a property’s estimated annual net operating income with its value. It is a quick way to express an income-to-price relationship before financing, rather than a complete forecast of the return to an individual owner. This page starts with annual gross income, then deducts operating expenses and vacancy using the percentages you enter.

The calculation can help compare assumptions for rental-property income, but it does not verify rents, assess the building or select an appropriate market price. A cap rate becomes meaningful only when the income definition, expense treatment and valuation date are consistent. Two properties with identical displayed rates can still have very different risks, capital needs and leasing situations.

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How to Use This Calculator

  1. Enter Property value using the price or valuation basis you intend to analyze. State whether this is an asking price, purchase price or another estimate.
  2. Enter Annual gross income as a full-year amount. If you start from monthly rent, annualize it consistently and distinguish potential rent from income already reduced for vacancy.
  3. Enter Operating expenses as a percentage of gross income. If you know expenses as a currency amount, divide them by gross income and multiply by 100 before entering the percentage.
  4. Enter Vacancy rate as a percentage of the same gross-income base. This model deducts both percentages independently from gross income, so do not deduct vacancy twice.
  5. Choose Calculate. Review the estimated NOI and cap rate, then test reasonable alternative rent, expense or vacancy assumptions separately. Keep financing and personal tax calculations outside this unlevered measure.
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Formula Used

Operating expenses = gross income × expense%/100. Vacancy loss = gross income × vacancy%/100. NOI = gross income − operating expenses − vacancy loss. Cap rate = NOI/property value × 100%.
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Variables Explained

ItemMeaning
Property valueThe denominator used to compare annual income with price. It must be positive for a meaningful capitalization rate.
Annual gross incomeThe gross annual income base before the two percentage deductions used here. It must use the same currency and scale as property value.
Operating expenses percentageThe operating-cost assumption applied to gross income. It is not an interest rate, mortgage payment or percentage of property value.
Vacancy rateThe percentage of gross income deducted as vacancy loss in this simplified model. It is an income allowance, rather than a count of empty units.
NOINet operating income after the modeled operating costs and vacancy, before financing and investor-specific income tax. The exact expense definition should be documented.
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Worked Example

Suppose property value is 300,000, annual gross income is 40,000, operating expenses are 30% and vacancy is 10%. Operating costs are 12,000 and vacancy loss is 4000. NOI is 40,000 − 12,000 − 4000 = 24,000. Cap rate is 24,000/300,000 × 100 = 8%.

If vacancy rises to 15% with everything else unchanged, vacancy loss becomes 6000 and NOI falls to 22,000. The cap rate becomes about 7.33%. This comparison shows how an income assumption changes the ratio; it does not imply that future vacancy is known.

The same 24,000 NOI on a value of 400,000 gives a 6% cap rate. Rearranging the relationship, a chosen 8% capitalization rate applied to 24,000 of NOI implies 24,000/0.08 = 300,000. Selecting an appropriate rate requires evidence beyond this calculator.

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Why Use This Calculator?

A higher cap rate can mean more current operating income relative to value, but it can also accompany weaker income prospects or greater uncertainty. The ratio alone does not establish that a property is a better investment. Compare the condition of the income stream and the reason for any difference, rather than ranking properties solely by the percentage.

Cap rate is different from cash-on-cash return. Mortgage payments and the owner’s equity contribution affect cash-on-cash results but are not part of this page’s cap-rate formula. Likewise, future appreciation, sale costs, major capital work and tax consequences are outside this annual income ratio.

This model’s percentage approach is intentionally simple. If a property has fixed expenses that do not move with rent, applying one percentage to every rent scenario may misrepresent the cost structure. An itemized operating statement and realistic capital plan can support a more detailed analysis. When comparing a quoted cap rate with this output, reconcile the underlying NOI before assuming the arithmetic is inconsistent.

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Common Mistakes

    • Do not enter monthly gross income against a property value and interpret the result as an annual cap rate.
    • Do not include mortgage principal and interest in operating expenses when comparing an unlevered NOI-based cap rate.
    • Do not reduce gross income for vacancy and also enter the same vacancy loss as a percentage.
    • Do not interpret the page’s zero response for a nonpositive property value as a valid valuation result. A positive denominator is required.
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Frequently Asked Questions

Is a higher cap rate always better?

No. It describes an income-to-value ratio, while the sustainability and risk of that income require separate review. Lease terms, condition, location and future costs can change how a rate should be interpreted.

What if I already know net operating income?

This form derives NOI from gross income and two deductions. To reproduce a known NOI without double counting, you would need inputs that reconcile exactly to that amount. Keep the source operating statement available for comparison.

Does the result include property appreciation?

No. It uses annual operating income and a current value assumption. A forecast including a future sale needs holding-period cash flows, a resale value and the relevant transaction costs.

Do the currency selectors convert exchange rates?

No. Use one currency and one scale for all amounts. The ratio is dimensionless only when numerator and denominator are comparable; selecting a different label does not perform a currency conversion.

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Sources & References

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