#rental-calculator-wrapper * {
box-sizing: border-box;
}
#rental-calculator-wrapper .calc-header {
background: #2c3e50;
color: #fff;
padding: 20px;
text-align: center;
}
#rental-calculator-wrapper .calc-header h2 {
margin: 0;
font-size: 24px;
}
#rental-calculator-wrapper .calc-body {
padding: 25px;
display: flex;
flex-wrap: wrap;
gap: 20px;
}
#rental-calculator-wrapper .input-section {
flex: 1;
min-width: 300px;
}
#rental-calculator-wrapper .results-section {
flex: 1;
min-width: 300px;
background: #f8f9fa;
padding: 20px;
border-radius: 8px;
border: 1px solid #e9ecef;
}
#rental-calculator-wrapper .form-group {
margin-bottom: 15px;
}
#rental-calculator-wrapper label {
display: block;
font-weight: 600;
margin-bottom: 5px;
font-size: 14px;
color: #495057;
}
#rental-calculator-wrapper input[type="number"] {
width: 100%;
padding: 10px;
border: 1px solid #ced4da;
border-radius: 4px;
font-size: 16px;
}
#rental-calculator-wrapper .section-title {
font-size: 18px;
color: #2c3e50;
border-bottom: 2px solid #27ae60;
padding-bottom: 5px;
margin-bottom: 15px;
margin-top: 0;
}
#rental-calculator-wrapper button.calc-btn {
width: 100%;
background: #27ae60;
color: white;
border: none;
padding: 15px;
font-size: 18px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
transition: background 0.3s;
margin-top: 10px;
}
#rental-calculator-wrapper button.calc-btn:hover {
background: #219150;
}
#rental-calculator-wrapper .result-row {
display: flex;
justify-content: space-between;
margin-bottom: 12px;
padding-bottom: 8px;
border-bottom: 1px solid #dee2e6;
}
#rental-calculator-wrapper .result-row.main-result {
font-size: 20px;
font-weight: 800;
color: #2c3e50;
border-bottom: 2px solid #2c3e50;
margin-top: 15px;
}
#rental-calculator-wrapper .result-label {
color: #6c757d;
}
#rental-calculator-wrapper .result-value {
font-weight: 700;
color: #2c3e50;
}
#rental-calculator-wrapper .positive {
color: #27ae60;
}
#rental-calculator-wrapper .negative {
color: #c0392b;
}
#rental-content-article {
padding: 25px;
border-top: 1px solid #eee;
color: #333;
line-height: 1.6;
}
#rental-content-article h2 {
color: #2c3e50;
margin-top: 25px;
}
#rental-content-article h3 {
color: #27ae60;
margin-top: 20px;
}
#rental-content-article p {
margin-bottom: 15px;
}
#rental-content-article ul {
margin-bottom: 15px;
padding-left: 20px;
}
function calculateRentalROI() {
// 1. Get Inputs
var price = parseFloat(document.getElementById('prop_price').value);
var downPercent = parseFloat(document.getElementById('prop_down').value);
var closingCosts = parseFloat(document.getElementById('prop_closing').value);
var interestRate = parseFloat(document.getElementById('prop_rate').value);
var loanTerm = parseFloat(document.getElementById('prop_term').value);
var monthlyRent = parseFloat(document.getElementById('prop_rent').value);
var taxAnnual = parseFloat(document.getElementById('prop_tax').value);
var insuranceAnnual = parseFloat(document.getElementById('prop_ins').value);
var hoaMonthly = parseFloat(document.getElementById('prop_hoa').value);
var maintPercent = parseFloat(document.getElementById('prop_maint').value);
// Validation
if (isNaN(price) || isNaN(downPercent) || isNaN(interestRate) || isNaN(monthlyRent)) {
alert("Please enter valid numbers for Price, Down Payment, Rate, and Rent.");
return;
}
// 2. Calculations
var downPaymentAmount = price * (downPercent / 100);
var loanAmount = price – downPaymentAmount;
var totalInitialCash = downPaymentAmount + closingCosts;
// Mortgage Calculation (Monthly P&I)
var monthlyRate = (interestRate / 100) / 12;
var totalPayments = loanTerm * 12;
var monthlyMortgage = 0;
if (interestRate === 0) {
monthlyMortgage = loanAmount / totalPayments;
} else {
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, totalPayments)) / (Math.pow(1 + monthlyRate, totalPayments) – 1);
}
// Expense Calculations
var monthlyTax = taxAnnual / 12;
var monthlyIns = insuranceAnnual / 12;
var monthlyMaintAndVacancy = monthlyRent * (maintPercent / 100);
var totalOperatingExpenses = monthlyTax + monthlyIns + hoaMonthly + monthlyMaintAndVacancy;
var totalMonthlyExpenses = totalOperatingExpenses + monthlyMortgage;
// Profit Calculations
var monthlyNOI = monthlyRent – totalOperatingExpenses;
var monthlyCashFlow = monthlyRent – totalMonthlyExpenses;
var annualCashFlow = monthlyCashFlow * 12;
var annualNOI = monthlyNOI * 12;
// ROI Metrics
var cocReturn = 0;
if (totalInitialCash > 0) {
cocReturn = (annualCashFlow / totalInitialCash) * 100;
}
var capRate = 0;
if (price > 0) {
capRate = (annualNOI / price) * 100;
}
// 3. Update UI
function formatMoney(num) {
return '$' + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
document.getElementById('res_investment').innerText = formatMoney(totalInitialCash);
document.getElementById('res_mortgage').innerText = formatMoney(monthlyMortgage);
document.getElementById('res_expenses').innerText = formatMoney(totalMonthlyExpenses);
document.getElementById('res_noi').innerText = formatMoney(monthlyNOI);
var cfElement = document.getElementById('res_cashflow');
cfElement.innerText = formatMoney(monthlyCashFlow);
if(monthlyCashFlow >= 0) {
cfElement.className = "result-value positive";
} else {
cfElement.className = "result-value negative";
}
var cocElement = document.getElementById('res_coc');
cocElement.innerText = cocReturn.toFixed(2) + '%';
if(cocReturn >= 0) {
cocElement.className = "result-value positive";
} else {
cocElement.className = "result-value negative";
}
document.getElementById('res_cap').innerText = capRate.toFixed(2) + '%';
var annCfElement = document.getElementById('res_annual_cf');
annCfElement.innerText = formatMoney(annualCashFlow);
if(annualCashFlow >= 0) {
annCfElement.className = "result-value positive";
} else {
annCfElement.className = "result-value negative";
}
}
Rental Property ROI Calculator
Purchase Details
Loan Details
Income & Expenses
Investment Analysis
Total Cash Needed:
$0.00
Monthly Mortgage (P&I):
$0.00
Total Monthly Expenses:
$0.00
Net Operating Income (Monthly):
$0.00
Monthly Cash Flow:
$0.00
Performance Metrics
Cash on Cash Return (ROI):
0.00%
Cap Rate:
0.00%
Annual Cash Flow:
$0.00
Mastering Your Rental Property Investment
Investing in real estate is a numbers game. Whether you are analyzing a single-family home, a duplex, or a condo, the difference between a profitable asset and a money pit lies in the calculations. This Rental Property ROI Calculator is designed to help investors accurately project cash flow and returns before signing on the dotted line.
Key Metrics Explained
- Cash Flow: This is the profit you pocket every month after all expenses (mortgage, taxes, insurance, repairs) are paid. Positive cash flow is essential for long-term sustainability.
- Cash on Cash Return (CoC ROI): This metric measures the annual return on the actual cash you invested (down payment + closing costs). For example, if you invest $50,000 and make $5,000 a year in profit, your CoC return is 10%.
- Cap Rate (Capitalization Rate): This calculates the property's natural rate of return without considering the mortgage. It helps compare the profitability of different properties regardless of how they are financed.
- NOI (Net Operating Income): The total income generated by the property minus all operating expenses, excluding the mortgage payment.
How to Use This Calculator
To get the most accurate results, input realistic numbers for your local market:
- Purchase Price & Loan: Enter the price and your loan terms. A typical conventional loan requires 20-25% down.
- Income: Input the expected monthly rent. Be conservative; check local listings (comps) to see what similar units rent for.
- Expenses: Don't underestimate expenses. We've included fields for Taxes, Insurance, and HOA. The "Maintenance & Vacancy Reserve" is crucial; setting aside 10-15% of rent is standard practice to cover empty months and broken water heaters.
Example Scenario
Imagine buying a property for $250,000 with 20% down ($50,000). If the rent is $2,200/month and your total monthly expenses (mortgage + taxes + maintenance) are $1,900, your monthly cash flow is $300. This results in an annual profit of $3,600. On a total cash investment of roughly $55,000 (including closing costs), your Cash on Cash Return would be approximately 6.5%.