Rental Property ROI & Cash Flow Calculator
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Monthly Cash Flow
$0.00
Net profit after all expenses
Cash on Cash Return
0.00%
Annual return on total cash invested
Total Monthly Expense
$0.00
Understanding Rental Property ROI
Investing in real estate is a numbers game. Whether you are analyzing a long-term buy-and-hold property or a BRRRR strategy, understanding your Return on Investment (ROI) is crucial for making profitable decisions. This Rental Property Calculator helps investors analyze the potential cash flow and profitability of a residential real estate investment.
Key Metrics Explained
1. Monthly Cash Flow
This is the money left over after all bills are paid. It is calculated by taking your total monthly rental income and subtracting all operating expenses and debt service (mortgage payments). Positive cash flow is essential for a sustainable investment.
2. Cash on Cash Return (CoC)
Cash on Cash Return measures the annual return on the actual cash you invested, rather than the total purchase price. It provides a realistic view of how hard your money is working for you.
Formula: (Annual Pre-Tax Cash Flow / Total Cash Invested) x 100
3. Cap Rate (Capitalization Rate)
Cap Rate measures the property's natural rate of return assuming it was bought with all cash (no loan). It helps compare the profitability of different properties regardless of financing.
Formula: (Net Operating Income / Purchase Price) x 100
How to Interpret Your Results
- Cash Flow: Aim for at least $200-$300 per door per month for single-family homes to cover unexpected capital expenditures.
- CoC Return: Many investors target 8-12% or higher, comparing it against stock market returns (historically 7-10%).
- Cap Rate: A higher Cap Rate generally indicates higher risk or a better deal. A 4-5% Cap Rate is common in high-appreciation areas, while 8-10% is seen in cash-flow-heavy markets.
Expenses to Watch Out For
Many new investors overestimate profit by ignoring hidden costs. This calculator accounts for:
- Vacancy: The estimated percentage of time the property sits empty.
- Maintenance: Setting aside 5-10% of rent for repairs is prudent.
- Management Fees: Professional property managers typically charge 8-10% of collected rent.
function calculateROI() {
// Get Input Values
var purchasePrice = parseFloat(document.getElementById('purchasePrice').value) || 0;
var downPaymentPerc = parseFloat(document.getElementById('downPaymentPerc').value) || 0;
var closingCosts = parseFloat(document.getElementById('closingCosts').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 propTaxRate = parseFloat(document.getElementById('propTax').value) || 0;
var annualInsurance = parseFloat(document.getElementById('insurance').value) || 0;
var monthlyHOA = parseFloat(document.getElementById('hoa').value) || 0;
var vacancyRate = parseFloat(document.getElementById('vacancyRate').value) || 0;
var maintenanceRate = parseFloat(document.getElementById('maintenance').value) || 0;
var managementRate = parseFloat(document.getElementById('management').value) || 0;
// 1. Calculate Mortgage
var downPaymentAmount = purchasePrice * (downPaymentPerc / 100);
var loanAmount = purchasePrice – downPaymentAmount;
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = loanTerm * 12;
var monthlyMortgage = 0;
if (loanAmount > 0 && interestRate > 0) {
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1);
} else if (loanAmount > 0 && interestRate === 0) {
monthlyMortgage = loanAmount / numberOfPayments;
}
// 2. Calculate Monthly Operating Expenses
var monthlyTax = (purchasePrice * (propTaxRate / 100)) / 12;
var monthlyInsurance = annualInsurance / 12;
var monthlyVacancy = monthlyRent * (vacancyRate / 100);
var monthlyMaintenance = monthlyRent * (maintenanceRate / 100);
var monthlyManagement = monthlyRent * (managementRate / 100);
var totalOperatingExpenses = monthlyTax + monthlyInsurance + monthlyHOA + monthlyVacancy + monthlyMaintenance + monthlyManagement;
var totalMonthlyExpenses = totalOperatingExpenses + monthlyMortgage;
// 3. Calculate Cash Flow
var monthlyCashFlow = monthlyRent – totalMonthlyExpenses;
var annualCashFlow = monthlyCashFlow * 12;
// 4. Calculate NOI (Net Operating Income)
// NOI = Income – Operating Expenses (Excludes Mortgage)
var monthlyNOI = monthlyRent – totalOperatingExpenses;
var annualNOI = monthlyNOI * 12;
// 5. Calculate Returns
var totalCashInvested = downPaymentAmount + closingCosts;
var cocReturn = 0;
if (totalCashInvested > 0) {
cocReturn = (annualCashFlow / totalCashInvested) * 100;
}
var capRate = 0;
if (purchasePrice > 0) {
capRate = (annualNOI / purchasePrice) * 100;
}
// Display Results
var cashFlowEl = document.getElementById('monthlyCashFlow');
cashFlowEl.innerText = formatCurrency(monthlyCashFlow);
if(monthlyCashFlow < 0) {
cashFlowEl.classList.add('negative');
} else {
cashFlowEl.classList.remove('negative');
}
document.getElementById('cocReturn').innerText = cocReturn.toFixed(2) + '%';
// Secondary Results
document.getElementById('capRate').innerText = capRate.toFixed(2) + '%';
document.getElementById('totalExpenses').innerText = formatCurrency(totalMonthlyExpenses);
document.getElementById('monthlyNOI').innerText = formatCurrency(monthlyNOI);
}
function formatCurrency(num) {
return '$' + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
// Initialize calculation on load
calculateROI();