Free Cap Rate Calculator for Rental Properties
Calculate rental property cap rate and Net Operating Income (NOI) instantly. Screen property-level returns, evaluate operating expenses, and test investment assumptions before submitting an offer.
Cap Rate Formula & Overview
Cap rate estimates a property's annual net operating income relative to its value. It is useful for comparing income-producing properties, but it should not be treated as a complete investment decision.
Cap Rate = Net Operating Income ÷ Property Value × 100
What Is Cap Rate?
The capitalization rate (cap rate) measures the property-level operating return on a real estate asset before accounting for financing or debt service. Net Operating Income (NOI) is central to this calculation: it represents the total cash generated by property operations after all recurring operating expenses have been deducted.
Real estate investors frequently use cap rates to quickly compare the operating yield of different properties or asset classes. However, cap rate alone does not capture leverage, future appreciation, major capital repair backlogs, or property-specific legal and physical risks.
There is no universal "good cap rate." Appropriate capitalization rates vary across property types (multifamily, single-family, industrial, retail), submarket locations, asset quality, local economic conditions, and perceived investment risk.
What Expenses Go Into NOI?
To accurately compute Net Operating Income and cap rate, investors must separate property-level operating expenses from ownership or financing costs.
Typically Included in Operating Expenses:
- Annual real estate property taxes
- Hazard, liability, and flood property insurance
- Repairs and routine maintenance reserves
- Professional property management fees
- Owner-paid utilities (water, sewer, trash, common-area electric)
- Other recurring property operating costs (landscaping, pest control, legal/accounting)
Typically Excluded from NOI:
- Mortgage principal and mortgage interest payments
- Depreciation and tax amortization
- Federal, state, and local income taxes
- Major capital expenditures (roof replacements, structural additions)
- Owner-specific financing charges or investor distributions
Financing costs are generally excluded from NOI because cap rate measures property-level operating return before debt service. Operating expense treatments may vary depending on accounting context, so investors should always verify actual historical operating statements.
Cap Rate Example
Consider a representative rental property investment:
- Property value / Purchase price: $500,000
- Effective gross income (annual rent minus vacancy): $42,000
- Total annual operating expenses: $15,000
- Net Operating Income (NOI): $42,000 − $15,000 = $27,000
Calculated Cap Rate:
$27,000 ÷ $500,000 × 100 = 5.40%
This 5.40% capitalization rate reflects the unleveraged operating yield of the asset. Whether 5.40% is suitable depends entirely on the submarket benchmark, cost of capital, physical condition, and investor objectives.
What Cap Rate Doesn't Tell You
Cap rate tells you the return. It doesn't tell you the risk.
A property can show an attractive cap rate while still depending on aggressive rents, understated expenses, weak market conditions or other assumptions. Specifically, cap rate may not reveal:
- Whether advertised or projected pro forma rents are actually achievable in the neighborhood
- Whether operating expenses (such as property taxes post-reassessment or insurance) have been artificially suppressed
- Future capital expenditure needs (aging mechanicals, roof replacement, plumbing failures)
- Debt financing risk, interest rate spreads, or negative leverage
- Economic vacancy drift, tenant credit default risks, or collection shortfalls
- Neighborhood or submarket economic deterioration and supply pipeline gluts
- Property-specific legal, environmental, HOA special assessment, or physical vulnerabilities
- Sensitivity of cash flow when macro assumptions shift
That's why PropVex goes beyond a single ratio and screens the broader deal.
Frequently Asked Questions
- How do you calculate cap rate?
- Cap rate is calculated by dividing annual Net Operating Income (NOI) by the purchase price or current market value, multiplied by 100: Cap Rate = (NOI ÷ Property Value) × 100.
- What is NOI in real estate?
- Net Operating Income (NOI) is the gross income of an investment property minus all operating expenses, calculated before mortgage interest, principal, and capital expenditures.
- Do mortgage payments count in cap rate?
- No. Financing costs and mortgage payments are excluded from NOI because cap rate evaluates property-level performance independent of how an investor finances the purchase.
- What is a good cap rate for a rental property?
- There is no single benchmark cap rate. Appropriate yields vary by market tier, asset class, building age, location, and risk tolerance.
- Can cap rate be negative?
- Yes. When annual operating expenses exceed effective gross revenue, NOI is negative, leading to a negative cap rate.
- Is cap rate enough to decide whether to buy a property?
- No. Cap rate is an initial screening ratio that does not account for financing terms, capex backlogs, tenant quality, or submarket risk.
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