.rental-calculator-container {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
padding: 20px;
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
}
.rental-calc-header {
text-align: center;
margin-bottom: 30px;
}
.rental-calc-header h2 {
color: #2c3e50;
margin-bottom: 10px;
}
.rental-input-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
.rental-input-grid {
grid-template-columns: 1fr;
}
}
.rental-input-group {
margin-bottom: 15px;
}
.rental-input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #555;
font-size: 0.9em;
}
.rental-input-group input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
}
.rental-input-group input:focus {
border-color: #3498db;
outline: none;
}
.rental-calc-btn {
display: block;
width: 100%;
padding: 15px;
background-color: #27ae60;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
margin-top: 20px;
transition: background-color 0.3s;
}
.rental-calc-btn:hover {
background-color: #219150;
}
.rental-results {
margin-top: 30px;
background: #fff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 5px rgba(0,0,0,0.05);
display: none;
}
.result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.result-row.highlight {
background-color: #e8f8f5;
padding: 15px;
border-radius: 4px;
border-bottom: none;
margin-top: 10px;
}
.result-value {
font-weight: bold;
color: #2c3e50;
}
.result-row.highlight .result-value {
color: #27ae60;
font-size: 1.2em;
}
.seo-content {
margin-top: 50px;
line-height: 1.6;
color: #333;
}
.seo-content h3 {
color: #2c3e50;
margin-top: 25px;
}
.error-msg {
color: #c0392b;
text-align: center;
margin-top: 10px;
display: none;
}
function calculateRentalResults() {
// Get Input Values
var price = parseFloat(document.getElementById('purchasePrice').value);
var downPercent = parseFloat(document.getElementById('downPaymentPercent').value);
var rate = parseFloat(document.getElementById('interestRate').value);
var years = parseFloat(document.getElementById('loanTerm').value);
var rent = parseFloat(document.getElementById('monthlyRent').value);
var tax = parseFloat(document.getElementById('annualTaxes').value);
var insurance = parseFloat(document.getElementById('annualInsurance').value);
var hoa = parseFloat(document.getElementById('monthlyHOA').value);
var vacancyPercent = parseFloat(document.getElementById('vacancyRate').value);
var errorDiv = document.getElementById('errorDisplay');
var resultsDiv = document.getElementById('rentalResults');
// Validation
if (isNaN(price) || isNaN(downPercent) || isNaN(rate) || isNaN(years) || isNaN(rent) ||
isNaN(tax) || isNaN(insurance) || isNaN(hoa) || isNaN(vacancyPercent)) {
errorDiv.style.display = 'block';
resultsDiv.style.display = 'none';
return;
}
errorDiv.style.display = 'none';
// Calculations
var downPayment = price * (downPercent / 100);
var loanAmount = price – downPayment;
// Mortgage Calculation (Principal & Interest)
var monthlyRate = (rate / 100) / 12;
var numPayments = years * 12;
var mortgagePayment = 0;
if (rate === 0) {
mortgagePayment = loanAmount / numPayments;
} else {
mortgagePayment = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numPayments)) / (Math.pow(1 + monthlyRate, numPayments) – 1);
}
// Monthly Expense Calculations
var monthlyTax = tax / 12;
var monthlyIns = insurance / 12;
var monthlyVacancyCost = rent * (vacancyPercent / 100);
var operatingExpenses = monthlyTax + monthlyIns + hoa + monthlyVacancyCost;
var totalMonthlyExpenses = mortgagePayment + operatingExpenses;
// Income and Cash Flow
var cashFlow = rent – totalMonthlyExpenses;
var annualCashFlow = cashFlow * 12;
// Return Metrics
var totalInvested = downPayment; // Simplified to down payment only for this level
var cocReturn = 0;
if (totalInvested > 0) {
cocReturn = (annualCashFlow / totalInvested) * 100;
}
// Cap Rate = Net Operating Income (Income – OpEx) / Price
// Note: NOI excludes mortgage payments
var noi = (rent * 12) – (operatingExpenses * 12);
var capRate = (noi / price) * 100;
// Update DOM
document.getElementById('resIncome').innerText = '$' + rent.toFixed(2);
document.getElementById('resMortgage').innerText = '$' + mortgagePayment.toFixed(2);
document.getElementById('resOpEx').innerText = '$' + operatingExpenses.toFixed(2);
document.getElementById('resTotalExp').innerText = '$' + totalMonthlyExpenses.toFixed(2);
var cfElement = document.getElementById('resCashFlow');
cfElement.innerText = '$' + cashFlow.toFixed(2);
cfElement.style.color = cashFlow >= 0 ? '#27ae60' : '#c0392b';
var cocElement = document.getElementById('resCOC');
cocElement.innerText = cocReturn.toFixed(2) + '%';
cocElement.style.color = cocReturn >= 0 ? '#27ae60' : '#c0392b';
document.getElementById('resCapRate').innerText = capRate.toFixed(2) + '%';
document.getElementById('resInvested').innerText = '$' + totalInvested.toFixed(2);
resultsDiv.style.display = 'block';
}
Rental Property Cash Flow Calculator
Analyze your real estate investment potential with precision.
Please enter valid positive numbers for all fields.
Monthly Analysis
Gross Monthly Income:
$0.00
Principal & Interest (Mortgage):
$0.00
Operating Expenses (Tax, Ins, HOA, Vacancy):
$0.00
Total Monthly Expenses:
$0.00
Net Monthly Cash Flow:
$0.00
Annual Returns
Cash-on-Cash Return (ROI):
0.00%
Cap Rate:
0.00%
Total Cash Invested (Down Payment):
$0.00
Mastering Rental Property Analysis
Investing in real estate is one of the most reliable ways to build wealth, but success hinges on the numbers. This Rental Property Cash Flow Calculator helps you look beyond the asking price to determine the true profitability of an investment asset.
Key Metrics Explained
- Cash Flow: This is the net profit you pocket every month after all bills are paid. It is calculated as Total Income – Total Expenses. Positive cash flow is essential for a sustainable investment strategy.
- Cash-on-Cash Return (CoC): This metric compares your annual pre-tax cash flow to the total cash invested (your down payment). It is arguably the most important metric for investors because it measures the efficiency of your specific capital.
- Cap Rate (Capitalization Rate): This measures the rate of return on a real estate investment property based on the income that the property is expected to generate. Unlike CoC, Cap Rate ignores financing, allowing you to compare the raw potential of different properties regardless of how they are bought.
The Importance of Vacancy & Maintenance
Novice investors often make the mistake of assuming a property will be occupied 100% of the time and nothing will break. This calculator includes a field for Vacancy & Repairs Provision. A standard conservative estimate is to set aside 10-15% of the gross rent to cover months where the unit is empty and for future repairs (like a new roof or HVAC repairs).
How to Use This Tool
simply enter your purchase details, financing terms, and expected operating costs. The calculator will instantly derive your projected monthly cash flow. Use this to "stress test" your deal: what happens to your cash flow if the interest rate rises by 1%? What if the vacancy rate doubles? Running these scenarios helps you buy with confidence.