#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-group {
flex: 1 1 45%;
min-width: 250px;
margin-bottom: 15px;
}
#rental-calculator-wrapper label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #333;
font-size: 14px;
}
#rental-calculator-wrapper input {
width: 100%;
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
#rental-calculator-wrapper input:focus {
border-color: #3498db;
outline: none;
}
#rental-calculator-wrapper .section-title {
width: 100%;
font-size: 18px;
font-weight: bold;
color: #2980b9;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
margin-bottom: 15px;
margin-top: 10px;
}
#rental-calculator-wrapper button {
width: 100%;
padding: 15px;
background: #27ae60;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background 0.3s;
margin-top: 10px;
}
#rental-calculator-wrapper button:hover {
background: #219150;
}
#rental-calculator-wrapper .results-area {
width: 100%;
background: #f9f9f9;
padding: 20px;
border-radius: 6px;
margin-top: 20px;
border: 1px solid #eee;
display: none;
}
#rental-calculator-wrapper .result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
#rental-calculator-wrapper .result-row:last-child {
border-bottom: none;
}
#rental-calculator-wrapper .result-label {
color: #555;
font-weight: 600;
}
#rental-calculator-wrapper .result-value {
font-weight: bold;
color: #2c3e50;
}
#rental-calculator-wrapper .result-highlight {
font-size: 20px;
color: #27ae60;
}
#rental-calculator-wrapper .error-msg {
color: #c0392b;
text-align: center;
display: none;
margin-top: 10px;
}
.article-content {
padding: 25px;
line-height: 1.6;
color: #333;
border-top: 1px solid #eee;
}
.article-content h3 {
color: #2c3e50;
margin-top: 25px;
}
.article-content ul {
margin-bottom: 20px;
}
.article-content li {
margin-bottom: 8px;
}
function calculateRental() {
// Get inputs
var price = parseFloat(document.getElementById('purchasePrice').value);
var downPercent = parseFloat(document.getElementById('downPayment').value);
var interestRate = parseFloat(document.getElementById('interestRate').value);
var years = parseFloat(document.getElementById('loanTerm').value);
var closingCosts = parseFloat(document.getElementById('closingCosts').value);
var rent = parseFloat(document.getElementById('monthlyRent').value);
var taxAnnual = parseFloat(document.getElementById('propertyTax').value);
var insAnnual = parseFloat(document.getElementById('insurance').value);
var hoaMonthly = parseFloat(document.getElementById('hoa').value);
var vacancyRate = parseFloat(document.getElementById('vacancyRate').value);
var maintRate = parseFloat(document.getElementById('maintenanceRate').value);
// Validation
if (isNaN(price) || isNaN(downPercent) || isNaN(interestRate) || isNaN(years) || isNaN(rent)) {
document.getElementById('errorMsg').style.display = 'block';
document.getElementById('resultsArea').style.display = 'none';
return;
} else {
document.getElementById('errorMsg').style.display = 'none';
}
// Calculations
var downPaymentAmount = price * (downPercent / 100);
var loanAmount = price – downPaymentAmount;
// Mortgage Calculation (P&I)
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = years * 12;
var mortgagePayment = 0;
if (interestRate === 0) {
mortgagePayment = loanAmount / numberOfPayments;
} else {
mortgagePayment = (loanAmount * monthlyRate) / (1 – Math.pow(1 + monthlyRate, -numberOfPayments));
}
// Monthly Expenses Breakdown
var taxMonthly = taxAnnual / 12;
var insMonthly = insAnnual / 12;
var vacancyMonthly = rent * (vacancyRate / 100);
var maintMonthly = rent * (maintRate / 100);
// Total Operating Expenses (excluding mortgage)
var operatingExpenses = taxMonthly + insMonthly + hoaMonthly + vacancyMonthly + maintMonthly;
// Total Monthly Expenses (including mortgage)
var totalMonthlyExpenses = operatingExpenses + mortgagePayment;
// NOI
var noiMonthly = rent – operatingExpenses;
var noiAnnual = noiMonthly * 12;
// Cash Flow
var cashFlowMonthly = rent – totalMonthlyExpenses;
var cashFlowAnnual = cashFlowMonthly * 12;
// Cash on Cash Return
var totalCashInvested = downPaymentAmount + closingCosts;
var cashOnCash = 0;
if (totalCashInvested > 0) {
cashOnCash = (cashFlowAnnual / totalCashInvested) * 100;
}
// Cap Rate
var capRate = (noiAnnual / price) * 100;
// Display Results
document.getElementById('resMortgage').innerText = '$' + mortgagePayment.toFixed(2);
document.getElementById('resExpenses').innerText = '$' + totalMonthlyExpenses.toFixed(2);
document.getElementById('resNOI').innerText = '$' + noiMonthly.toFixed(2);
document.getElementById('resCashFlow').innerText = '$' + cashFlowMonthly.toFixed(2);
document.getElementById('resCoC').innerText = cashOnCash.toFixed(2) + '%';
document.getElementById('resCapRate').innerText = capRate.toFixed(2) + '%';
// Color logic for cash flow
var cfElement = document.getElementById('resCashFlow');
if (cashFlowMonthly >= 0) {
cfElement.style.color = '#27ae60';
} else {
cfElement.style.color = '#c0392b';
}
document.getElementById('resultsArea').style.display = 'block';
}
Rental Property Cash Flow Calculator
Purchase Information
Income & Expenses
Please enter valid numerical values.
Monthly Mortgage (P&I):
$0.00
Total Monthly Expenses:
$0.00
Net Operating Income (NOI):
$0.00
Monthly Cash Flow:
$0.00
Cash on Cash Return (Annual):
0.00%
Cap Rate:
0.00%
How to Analyze a Rental Property Deal
Successful real estate investing relies on accurate math, not gut feelings. This Rental Property Cash Flow Calculator is designed to help investors determine the viability of a potential investment property by analyzing its income, expenses, and ultimate return on investment.
Understanding the Key Metrics
When you input your data above, the calculator outputs several critical financial indicators:
- Monthly Cash Flow: This is your profit after all expenses (mortgage, taxes, insurance, repairs) are paid. Positive cash flow means the property pays for itself and puts money in your pocket.
- Net Operating Income (NOI): This represents the profitability of the property before financing costs. It is calculated as Total Income – Operating Expenses (excluding mortgage payments).
- Cash on Cash Return (CoC): This is arguably the most important metric for investors. It measures the annual return on the actual cash you invested (down payment + closing costs). A CoC of 8-12% is generally considered good in many markets.
- Cap Rate: The Capitalization Rate measures the natural rate of return of the property assuming you bought it for all cash. It helps compare properties regardless of financing.
Typical Expense Guidelines
If you are new to investing, it can be hard to estimate expenses. Here are some industry standards used by professionals:
- Vacancy Rate: Always budget for vacancy. 5% represents about 18 days vacant per year, while 8-10% is safer for high-turnover areas.
- Maintenance & CapEx: Budgeting 5-10% of gross rent for repairs (broken toilets, paint) and Capital Expenditures (new roof, HVAC) is crucial to avoid cash flow shock.
- Management Fees: If you hire a property manager, they typically charge 8-10% of the monthly rent.
Use this tool to run "what-if" scenarios. Adjust the purchase price or down payment to see how it affects your Cash on Cash return and ensure your investment meets your financial goals.