Cap Rate Calculator

How to Use This Calculator

1. Select your calculation mode: Choose "Calculate Cap Rate" to find the yield of an existing deal, or choose "Valuation by Target Cap Rate" to calculate the maximum purchase offer price for a property.
2. Enter property price or target cap rate: In Mode A, input the property's acquisition cost or current market value. In Mode B, enter your required minimum capitalization rate (e.g. 6.5%).
3. Add expected rental income and vacancy allowance: Enter gross scheduled rent (toggle between monthly or annual amounts) and add your local market vacancy rate (typically 5% to 8%).
4. Itemize operating expenses: Enter annual property taxes, hazard insurance, estimated repairs, management fees, and capital reserves to calculate precise Net Operating Income (NOI).

I built this tool because looking at gross rental yields from real estate listings is one of the easiest ways for everyday buyers to misjudge an investment. In property brochures, developers love highlighting gross rents that look like easy double-digit returns. But the moment you factor in actual municipal property taxes, insurance premiums, turnover repairs, and realistic vacancy gaps, the true net income looks entirely different. Running the exact numbers first protects you from overpaying for someone else's problem property.

The Formula

The capitalization rate measures the unleveraged rate of return generated by an income-producing property over a 12-month period:

• Gross Scheduled Income (GSI): The maximum theoretical gross revenue the property could produce if 100% occupied throughout the entire year, plus supplemental income from parking spaces, on-site laundry, and storage units.
• Vacancy & Credit Loss: An allowance for periodic tenant turnover, uncollected rent, and leasing downtime. Multiplying GSI by your vacancy percentage gives uncollected revenue.
• Effective Gross Income (EGI): The actual net cash revenue collected by the property owner after subtracting vacancy and tenant credit losses from scheduled income.
• Operating Expenses: All day-to-day ongoing costs required to operate and maintain the property, including real estate property taxes, hazard/flood insurance policies, regular maintenance and repairs, leasing management fees, and routine utilities.
• Net Operating Income (NOI): The fundamental earnings metric in commercial and residential real estate. Crucially, debt service (mortgage principal and interest), capital expenditures, income taxes, and depreciation are strictly excluded from NOI.
• Operating Expense Ratio (OER): The percentage of collected revenue consumed by operations, computed as (Total Operating Expenses / EGI) × 100.

Because capitalization rate completely excludes mortgage financing terms, it allows investors to compare properties in different neighborhoods and asset classes on an exact apples-to-apples basis regardless of how the buyer intends to finance the purchase.

Example

Suppose an investor is evaluating a residential duplex listed for $450,000.00. Each unit rents for $2,100 per month, generating a combined rental income of $4,200.00 per month ($50,400.00 annually). The property also generates $1,200.00 per year in shared laundry and parking fees.

The investor models a conservative 5% vacancy allowance and itemizes yearly operating expenses:

• Gross Scheduled Income (GSI): $50,400.00 + $1,200.00 = $51,600.00
• Vacancy Loss (5%): $51,600.00 × 0.05 = $2,580.00
• Effective Gross Income (EGI): $51,600.00 − $2,580.00 = $49,020.00
• Annual Operating Expenses:
  • Property Taxes: $4,800.00
  • Landlord Hazard Insurance: $1,800.00
  • Maintenance & Turnover Repairs: $3,600.00
  • Property Management Fee (8% of EGI): $3,921.60
  • Utilities & Reserves: $1,418.40
  • Total Operating Expenses: $15,540.00 (Operating Expense Ratio: 31.70%)
• Annual Net Operating Income (NOI): $49,020.00 − $15,540.00 = $33,480.00 ($2,790.00 per month)
• Capitalization Rate: ($33,480.00 ÷ $450,000.00) × 100 = 7.44%

At 7.44%, this property falls squarely into the Class B Balanced Yield category. It delivers healthy net cash yield while remaining well above the local cost of capital. If a competing investor required a higher 8.5% cap rate for this sub-market, their maximum offer price would be $33,480 / 0.085 = $393,882.35.

Seeing that full expense breakdown written out is always an eye-opener. When people talk about rental properties, they almost always brag about the monthly check coming in, not the water heater replacement or the municipal tax hike that arrived six months later. Knowing your true net operating income before you make an offer gives you real leverage at the negotiating table.

Frequently Asked Questions