Rental Property ROI & Cash Flow Calculator
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Investment Analysis
Cash on Cash Return
0.00%
Monthly Financial Breakdown
-
Total Monthly Income:
$0.00
-
Mortgage Payment (P&I):
$0.00
-
Operating Expenses (Tax, Ins, Maint, etc.):
$0.00
-
Net Operating Income (NOI):
$0.00
Understanding Rental Property ROI
Investing in real estate is one of the most reliable ways to build wealth, but simply buying a property doesn't guarantee a profit. To succeed, investors must rigorously analyze the numbers. Our Rental Property ROI Calculator helps you determine if a potential deal will generate positive cash flow and an acceptable return on investment.
Key Metrics Explained
1. Cash Flow
Cash flow is the profit you bring in each month after all operating expenses and mortgage payments are made.
Formula: Gross Rental Income – Total Expenses – Mortgage Payment = Cash Flow.
Positive cash flow is essential for a sustainable rental business. If your cash flow is negative, you are effectively paying out of pocket to hold the property.
2. Cash on Cash Return (CoC)
This is arguably the most important metric for rental investors. It measures the annual return on the actual cash you invested (down payment + closing costs), rather than the total price of the property.
Formula: (Annual Pre-Tax Cash Flow / Total Cash Invested) × 100.
A CoC return of 8-12% is often considered good in many markets, though this varies by strategy.
3. Cap Rate (Capitalization Rate)
Cap rate measures the property's natural rate of return assuming you bought it with all cash (no loan). It helps compare the profitability of different properties regardless of financing.
Formula: (Net Operating Income / Purchase Price) × 100.
How to Estimate Expenses Properly
New investors often overestimate profit by underestimating expenses. When using this calculator, ensure you account for:
- Vacancy: Properties won't be rented 365 days a year. A 5% to 8% vacancy allowance is standard.
- Maintenance: Even if the house is new, things break. Budget 5-10% of rent for repairs.
- CapEx: Save for big-ticket items like roof or HVAC replacement (often included in maintenance buffers).
Interpreting Your Results
If your Cash Flow is negative, the deal is likely a liability unless you are banking purely on appreciation (a risky strategy). If your Cash on Cash Return is lower than the stock market average (historically 7-10%), you might want to reconsider the leverage or the purchase price.
function calculateRentalROI() {
// 1. Get Input Values
var purchasePrice = parseFloat(document.getElementById('purchasePrice').value) || 0;
var closingCosts = parseFloat(document.getElementById('closingCosts').value) || 0;
var downPayment = parseFloat(document.getElementById('downPayment').value) || 0;
var interestRate = parseFloat(document.getElementById('interestRate').value) || 0;
var loanTerm = parseFloat(document.getElementById('loanTerm').value) || 0;
var monthlyRent = parseFloat(document.getElementById('monthlyRent').value) || 0;
var otherIncome = parseFloat(document.getElementById('otherIncome').value) || 0;
var annualTax = parseFloat(document.getElementById('annualTax').value) || 0;
var annualInsurance = parseFloat(document.getElementById('annualInsurance').value) || 0;
var monthlyHOA = parseFloat(document.getElementById('monthlyHOA').value) || 0;
var monthlyMaintenance = parseFloat(document.getElementById('monthlyMaintenance').value) || 0;
var vacancyRate = parseFloat(document.getElementById('vacancyRate').value) || 0;
// 2. Calculate Mortgage (Principal & Interest)
var loanAmount = purchasePrice – downPayment;
var monthlyMortgage = 0;
if (loanAmount > 0 && interestRate > 0 && loanTerm > 0) {
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = loanTerm * 12;
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1);
}
// 3. Calculate Income
var totalMonthlyIncome = monthlyRent + otherIncome;
var vacancyCost = totalMonthlyIncome * (vacancyRate / 100);
var effectiveGrossIncome = totalMonthlyIncome – vacancyCost;
// 4. Calculate Operating Expenses (Monthly)
var monthlyTax = annualTax / 12;
var monthlyInsurance = annualInsurance / 12;
var totalOperatingExpenses = monthlyTax + monthlyInsurance + monthlyHOA + monthlyMaintenance;
// 5. Calculate Metrics
// NOI = Effective Income – Operating Expenses (Excludes Mortgage)
var monthlyNOI = effectiveGrossIncome – totalOperatingExpenses;
var annualNOI = monthlyNOI * 12;
// Cash Flow = NOI – Mortgage
var monthlyCashFlow = monthlyNOI – monthlyMortgage;
var annualCashFlow = monthlyCashFlow * 12;
// Total Cash Invested
var totalCashInvested = downPayment + closingCosts;
// Returns
var cocReturn = 0;
if (totalCashInvested > 0) {
cocReturn = (annualCashFlow / totalCashInvested) * 100;
}
var capRate = 0;
if (purchasePrice > 0) {
capRate = (annualNOI / purchasePrice) * 100;
}
// 6. Display Results
var resultDiv = document.getElementById('resultsContainer');
resultDiv.style.display = "block";
// Helper to format currency
var fmt = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' });
document.getElementById('resCashFlow').innerHTML = fmt.format(monthlyCashFlow);
document.getElementById('resCashFlow').className = monthlyCashFlow >= 0 ? 'result-value positive' : 'result-value negative';
document.getElementById('resCoc').innerHTML = cocReturn.toFixed(2) + "%";
document.getElementById('resCoc').className = cocReturn >= 0 ? 'result-value positive' : 'result-value negative';
document.getElementById('resCapRate').innerHTML = capRate.toFixed(2) + "%";
// Breakdown values
document.getElementById('bdIncome').innerHTML = fmt.format(effectiveGrossIncome);
document.getElementById('bdMortgage').innerHTML = "-" + fmt.format(monthlyMortgage);
document.getElementById('bdExpenses').innerHTML = "-" + fmt.format(totalOperatingExpenses);
document.getElementById('bdNOI').innerHTML = fmt.format(monthlyNOI);
// Scroll to results for mobile users
resultDiv.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}