.calc-wrapper {
max-width: 800px;
margin: 0 auto;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
color: #333;
line-height: 1.6;
}
.calc-container {
background: #f8f9fa;
padding: 30px;
border-radius: 8px;
box-shadow: 0 4px 6px rgba(0,0,0,0.1);
margin-bottom: 40px;
border: 1px solid #e9ecef;
}
.calc-title {
text-align: center;
margin-bottom: 25px;
color: #2c3e50;
font-size: 24px;
font-weight: 700;
}
.input-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
.input-grid {
grid-template-columns: 1fr;
}
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
font-size: 14px;
color: #495057;
}
.input-group input, .input-group select {
width: 100%;
padding: 10px;
border: 1px solid #ced4da;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.input-group input:focus {
border-color: #4CAF50;
outline: none;
}
.section-header {
grid-column: 1 / -1;
margin-top: 10px;
margin-bottom: 10px;
font-size: 18px;
color: #2c3e50;
border-bottom: 2px solid #ddd;
padding-bottom: 5px;
}
.calc-btn {
display: block;
width: 100%;
padding: 15px;
background-color: #2c3e50;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background 0.3s;
margin-top: 20px;
}
.calc-btn:hover {
background-color: #1a252f;
}
.results-box {
margin-top: 30px;
background: white;
padding: 20px;
border-radius: 6px;
border: 1px solid #e9ecef;
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
font-weight: 500;
color: #555;
}
.result-value {
font-weight: 700;
color: #2c3e50;
}
.highlight-result {
background-color: #f0fdf4;
padding: 15px;
border-radius: 4px;
margin-top: 15px;
border: 1px solid #bbf7d0;
}
.highlight-result .result-value {
color: #166534;
font-size: 1.2em;
}
.error-msg {
color: #dc3545;
text-align: center;
margin-top: 10px;
display: none;
}
.content-section h2 {
color: #2c3e50;
margin-top: 30px;
}
.content-section h3 {
color: #34495e;
margin-top: 20px;
}
.content-section p {
margin-bottom: 15px;
color: #555;
}
.content-section ul {
margin-bottom: 15px;
padding-left: 20px;
}
.content-section li {
margin-bottom: 8px;
}
function calculateROI() {
// Get Input Values
var price = parseFloat(document.getElementById('purchasePrice').value);
var downPercent = parseFloat(document.getElementById('downPayment').value);
var closingCosts = parseFloat(document.getElementById('closingCosts').value);
var interestRate = parseFloat(document.getElementById('interestRate').value);
var loanTerm = parseFloat(document.getElementById('loanTerm').value);
var rent = parseFloat(document.getElementById('monthlyRent').value);
var propertyTax = parseFloat(document.getElementById('propertyTax').value);
var insurance = parseFloat(document.getElementById('insurance').value);
var hoa = parseFloat(document.getElementById('hoa').value);
var maintenancePercent = parseFloat(document.getElementById('maintenance').value);
var vacancyPercent = parseFloat(document.getElementById('vacancy').value);
var managementPercent = parseFloat(document.getElementById('management').value);
// Validation
if (isNaN(price) || isNaN(downPercent) || isNaN(rent) || isNaN(interestRate)) {
document.getElementById('errorMsg').style.display = 'block';
document.getElementById('results').style.display = 'none';
return;
} else {
document.getElementById('errorMsg').style.display = 'none';
}
// Loan Calculations
var downPaymentAmount = price * (downPercent / 100);
var loanAmount = price – downPaymentAmount;
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = loanTerm * 12;
var mortgagePayment = 0;
if (interestRate > 0) {
mortgagePayment = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1);
} else {
mortgagePayment = loanAmount / numberOfPayments;
}
// Monthly Expenses
var monthlyTax = propertyTax / 12;
var monthlyIns = insurance / 12;
var monthlyMaintenance = rent * (maintenancePercent / 100);
var monthlyVacancy = rent * (vacancyPercent / 100);
var monthlyManagement = rent * (managementPercent / 100);
var fixedExpenses = monthlyTax + monthlyIns + hoa;
var operatingExpenses = fixedExpenses + monthlyMaintenance + monthlyVacancy + monthlyManagement;
var totalMonthlyExpenses = operatingExpenses + mortgagePayment;
// Cash Flow
var monthlyCashFlow = rent – totalMonthlyExpenses;
var annualCashFlow = monthlyCashFlow * 12;
// NOI (Net Operating Income)
// NOI = Annual Income – Operating Expenses (Excluding Debt Service)
var annualGrossIncome = rent * 12;
var annualOperatingExpenses = operatingExpenses * 12;
var annualNOI = annualGrossIncome – annualOperatingExpenses;
// ROI Metrics
var totalInitialInvestment = downPaymentAmount + closingCosts;
var capRate = (annualNOI / price) * 100;
var cashOnCash = (annualCashFlow / totalInitialInvestment) * 100;
// Formatting Function
function formatCurrency(num) {
return '$' + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
function formatPercent(num) {
return num.toFixed(2) + '%';
}
// Display Results
document.getElementById('resGrossRent').innerHTML = formatCurrency(rent);
document.getElementById('resVacancy').innerHTML = formatCurrency(monthlyVacancy);
document.getElementById('resManagement').innerHTML = formatCurrency(monthlyManagement);
document.getElementById('resMaintenance').innerHTML = formatCurrency(monthlyMaintenance);
document.getElementById('resFixedExpenses').innerHTML = formatCurrency(fixedExpenses);
document.getElementById('resMortgage').innerHTML = formatCurrency(mortgagePayment);
document.getElementById('resCashFlow').innerHTML = formatCurrency(monthlyCashFlow);
if(monthlyCashFlow < 0) {
document.getElementById('resCashFlow').style.color = '#dc3545';
} else {
document.getElementById('resCashFlow').style.color = '#166534';
}
document.getElementById('resTotalInvested').innerHTML = formatCurrency(totalInitialInvestment);
document.getElementById('resNOI').innerHTML = formatCurrency(annualNOI);
document.getElementById('resCapRate').innerHTML = formatPercent(capRate);
document.getElementById('resCoC').innerHTML = formatPercent(cashOnCash);
document.getElementById('results').style.display = 'block';
}
Rental Property ROI Calculator
Purchase Info
30 Years
15 Years
10 Years
Income & Expenses
Please enter valid numeric values for all fields.
Monthly Cash Flow Analysis
Gross Monthly Rent:
– Vacancy Loss:
– Property Management:
– Maintenance Reserve:
– Tax, Insurance & HOA:
– Mortgage Payment (P&I):
Monthly Cash Flow:
Investment Returns
Total Initial Cash Invested:
Net Operating Income (NOI) Annual:
Cap Rate:
Cash on Cash Return:
How to Analyze Rental Property Investments
Investing in real estate is one of the most reliable ways to build wealth, but simply buying a property doesn't guarantee a profit. Successful investors rely on specific metrics to determine if a property is a "deal" or a money pit. This calculator helps you evaluate the two most critical numbers in rental investing: Cash Flow and Return on Investment (ROI).
Understanding the Key Metrics
- Net Operating Income (NOI): This is the total income the property generates minus all operating expenses (taxes, insurance, maintenance), but excluding mortgage payments. It represents the profitability of the asset itself, regardless of financing.
- Cap Rate (Capitalization Rate): Calculated as
NOI / Purchase Price. This metric allows you to compare the profitability of different properties directly, assuming they were bought with all cash. A higher Cap Rate generally indicates a better return, though often with higher risk. - Cash on Cash Return: This is arguably the most important metric for leveraged investors. It is calculated as
Annual Cash Flow / Total Cash Invested. It tells you exactly how hard your actual dollars (down payment + closing costs) are working for you.
What is a "Good" Return?
There is no single answer, as it depends on your strategy and local market.
For Cash Flow, many investors look for at least $100-$200 per door per month in pure profit after all expenses and reserves. In high-cost markets, cash flow might be lower, but appreciation potential is higher.
For Cash on Cash Return, the stock market historically returns about 7-10% (inflation-adjusted). Therefore, many real estate investors aim for a Cash on Cash return of 8-12% or higher to justify the lack of liquidity and the effort of managing property.
The 50% Rule and 1% Rule
While this calculator provides precise numbers, investors often use "rules of thumb" for quick screening:
- The 1% Rule: Does the monthly rent equal at least 1% of the purchase price? If a home costs $200,000, it should rent for $2,000. This is a quick test for cash flow potential.
- The 50% Rule: Assume that 50% of your gross rent will go toward operating expenses (not including the mortgage). If your mortgage payment is more than the remaining 50%, the property likely won't cash flow.
Use the calculator above to move beyond these rough estimates and get an accurate financial picture of your potential investment property.