RentWiseCalc

Cap Rate Calculator

The Cap Rate Calculator computes the capitalization rate — the single most widely used metric for evaluating commercial and residential investment property. Cap rate measures a property's income potential as a percentage of its value, independent of financing. A higher cap rate signals higher income relative to price (and typically higher risk); a lower cap rate suggests a premium-priced, lower-risk asset. Use this alongside the Rental Yield Calculator to compare investment opportunities on a like-for-like basis.

$

Total rent collected before any expenses

$

Taxes, insurance, management, maintenance — not mortgage

$

Cap Rate

8.00%

Net Operating Income (NOI)

$28,000.00

Annual Gross Income

$36,000.00

Expense Ratio

22.2%

How to use this calculator

  1. 1

    Enter annual gross rental income

    The total rent you collect before deducting any expenses. For a multi-unit property, sum all unit rents.

  2. 2

    Enter annual operating expenses

    Include property management fees, insurance, property taxes, maintenance and repairs, and any other recurring costs. Do not include mortgage payments or depreciation — cap rate is a pre-financing metric.

  3. 3

    Enter the property value

    Use the current market value or purchase price. Cap rate changes over time as property values move — recalculate periodically to track investment performance.

  4. 4

    Read your cap rate and NOI

    The calculator shows cap rate, net operating income (NOI), gross income, and the expense ratio. A cap rate at or above 5% is generally considered acceptable; below 3% suggests the property is priced for appreciation rather than income.

Formula

NOI (Net Operating Income) = Annual Gross Income − Annual Operating Expenses

Cap Rate = (NOI ÷ Property Value) × 100

Expense Ratio = (Annual Operating Expenses ÷ Annual Gross Income) × 100

NOI is the annual income after operating expenses but before financing costs (mortgage interest, principal repayments) and income taxes. Cap rate expresses NOI as a percentage of the property's value, making it comparable across properties of different sizes and markets. Example: a property worth $350,000 with $36,000 gross income and $8,000 operating expenses has an NOI of $28,000 and a cap rate of 28,000 / 350,000 × 100 = 8.0%.

Worked Example

Annual Gross Rental Income: $36,000 Annual Operating Expenses: $8,000 Property Value: $350,000 NOI = $36,000 − $8,000 = $28,000 Cap Rate = ($28,000 ÷ $350,000) × 100 = 8.0% Expense Ratio = ($8,000 ÷ $36,000) × 100 = 22.2% An 8.0% cap rate is well above the 5% minimum threshold most investors use in secondary markets. In a primary market like New York or San Francisco, the same cap rate would be considered exceptional — properties there often trade at 3–4% cap rates due to appreciation expectations.

Frequently Asked Questions

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