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Rental Property Calculator

Calculate Net Operating Income, cash flow, cap rate, cash-on-cash return, and full pro forma for residential & commercial investment properties. Includes financing, expense breakdowns, and visual analytics.

Property Investment Inputs

PROPERTY PURCHASE & FINANCING

RENTAL INCOME (MONTHLY)

Parking, laundry, storage, etc.

ANNUAL OPERATING EXPENSES

All calculations update only after clicking Calculate Investment

Investment Summary

Monthly Cash Flow
$0.00
Annual: $0.00
Net Operating Income
$0.00 /yr
Cap Rate
0.00%
Cash-on-Cash Return
0.00%
Monthly Mortgage
$0.00
Total Initial Cash Invested
$0.00
Effective Gross Income (Annual)
$0.00

Potential Gross Rent Distribution

How every dollar of potential rent is allocated

Initial Cash Investment Breakdown

Detailed Pro Forma & Loan Schedule

Category Monthly Annual
Click "Calculate Investment" to generate detailed pro forma

📖 How To Use This Rental Property Calculator

This comprehensive tool helps real estate investors evaluate potential rental properties by computing key performance metrics including cash flow, NOI, cap rate, and cash-on-cash return. It supports both financed and all-cash purchases and provides visual breakdowns plus a full loan amortization schedule.

Input Field Definitions

Input Label Definition & Guidance Sample
Purchase PriceTotal acquisition price before closing costs and repairs$425,000
Down Payment %Percentage of purchase price paid in cash upfront. Remaining = loan principal20%
Loan Interest RateAnnual fixed mortgage interest rate (use current market rate)6.75%
Loan TermLength of mortgage in years (15/30 common for residential)30
Closing CostsOne-time buyer costs (title, escrow, origination, inspection, etc.)$8,500
Initial Repair / RehabImmediate capital expenditures to make property rent-ready or value-add$12,500
Expected Monthly RentProjected stabilized gross rent per month (use comps or market research)$2,850
Other Monthly IncomeAncillary income: parking, laundry, storage, pet fees, etc.$150
Vacancy RateExpected % of time unit sits vacant or credit loss (market dependent, 3-8% typical)5%
Property Mgmt FeePercentage of collected rent paid to property manager (0% if self-managed)8%
Property Taxes (Annual)Yearly property tax bill (check assessor site or estimate 1-1.5% of value)$5,800
Insurance (Annual)Landlord hazard + liability insurance premium$2,400
Maintenance & RepairsAnnual budget for ongoing upkeep, appliances, plumbing, etc. (rule of thumb 1% of value or $0.50-$1/sqft)$3,600
HOA / Condo FeesAnnual homeowners association or condo dues (if applicable)$1,200
Utilities (Owner Paid)Annual cost if owner pays any utilities (trash, water, electric in some leases)$0
Other ExpensesAny additional annual costs: landscaping, pest control, accounting, etc.$900

2. Calculation Flow & Order

  1. Compute loan principal from purchase price × (1 − down payment %)
  2. Calculate monthly mortgage payment using standard EMI formula (same engine as Loan EMI Calculator)
  3. Calculate Potential Gross Income (PGI) = (Monthly Rent + Other Income) × 12
  4. Apply vacancy loss → Collected Rent = PGI × (1 − vacancy rate)
  5. Subtract property management fee (applied to collected rent)
  6. Effective Gross Income (EGI) = Collected − Management Fee
  7. NOI = EGI − Total Annual Operating Expenses
  8. Annual Cash Flow = NOI − Annual Debt Service (12 × monthly mortgage)
  9. Cap Rate = (NOI ÷ Purchase Price) × 100
  10. Cash-on-Cash Return = (Annual Cash Flow ÷ Total Initial Cash Invested) × 100

🧮 Core Formulas & Mathematical Logic

Monthly Mortgage Payment (EMI)
EMI = P × r × (1 + r)n ÷ [(1 + r)n − 1]
P = Loan Principal, r = Monthly Interest Rate, n = Total Months
Net Operating Income (NOI)
NOI = Effective Gross Income − Operating Expenses

Effective Gross Income = (Gross Rent + Other Income) × (1 − Vacancy %) − Management Fee
Capitalization Rate (Cap Rate)
Cap Rate = (NOI ÷ Purchase Price) × 100

Higher is generally better — indicates unlevered yield. Typical good range: 5–10% depending on market and risk.
Cash-on-Cash Return (CoC)
CoC Return = (Annual Cash Flow ÷ Total Cash Invested) × 100

Total Cash Invested = Down Payment $ + Closing Costs + Repair Costs
Before-Tax Cash Flow
Annual BTCF = NOI − Annual Mortgage Payments
Monthly Cash Flow = BTCF ÷ 12

Positive = property pays you. Negative = you pay the property (common early years).

🏠 Understanding Key Rental Metrics

Net Operating Income (NOI)

The property’s true operating profitability before debt service and income taxes. The single most important number for commercial real estate valuation. Higher NOI directly increases property value (using cap rate).

Cap Rate

Measures return on property value ignoring financing. Useful for comparing properties across markets. A 7% cap rate property in a stable market may be excellent; the same 7% in a high-growth area might be average.

Cash-on-Cash Return

Your actual cash yield on the cash you put into the deal. This is the metric cash-flow investors care about most. Aim for 8–12%+ in many markets for strong deals.

Rules of Thumb (Included for Quick Reference)

  • 1% Rule: Monthly rent should be at least 1% of purchase price (e.g. $4,250 rent on $425k house). 2%+ is excellent.
  • 50% Rule: Operating expenses (excluding mortgage) often run ~50% of gross rent. Use as quick sanity check.
  • 70% Rule (for value-add/flips): Purchase price + repairs should be ≤ 70% of After-Repair Value.

❓ Common Issues & Troubleshooting