.rpc-row {
display: flex;
flex-wrap: wrap;
margin-bottom: 15px;
gap: 20px;
}
.rpc-col {
flex: 1;
min-width: 280px;
}
.rpc-label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #333;
}
.rpc-input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.rpc-input:focus {
border-color: #0073aa;
outline: none;
}
.rpc-header {
background-color: #0073aa;
color: white;
padding: 10px 15px;
margin: -20px -20px 20px -20px;
border-radius: 8px 8px 0 0;
text-align: center;
}
.rpc-header h2 {
margin: 0;
font-size: 24px;
}
.rpc-btn {
background-color: #28a745;
color: white;
border: none;
padding: 12px 24px;
font-size: 18px;
border-radius: 4px;
cursor: pointer;
width: 100%;
transition: background-color 0.3s;
font-weight: bold;
}
.rpc-btn:hover {
background-color: #218838;
}
.rpc-result-box {
background-color: #fff;
border: 1px solid #ddd;
border-radius: 4px;
padding: 20px;
margin-top: 20px;
box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
.rpc-metric {
display: flex;
justify-content: space-between;
border-bottom: 1px solid #eee;
padding: 10px 0;
font-size: 16px;
}
.rpc-metric:last-child {
border-bottom: none;
}
.rpc-metric-label {
color: #555;
}
.rpc-metric-value {
font-weight: bold;
color: #333;
}
.rpc-metric-value.positive {
color: #28a745;
}
.rpc-metric-value.negative {
color: #dc3545;
}
.rpc-highlight {
font-size: 20px;
background-color: #f0f8ff;
padding: 15px;
border-radius: 4px;
margin-bottom: 15px;
border-left: 5px solid #0073aa;
}
/* Article Styles */
.rpc-article {
margin-top: 40px;
color: #444;
line-height: 1.6;
}
.rpc-article h2 {
font-size: 22px;
color: #2c3e50;
margin-top: 30px;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
}
.rpc-article p {
margin-bottom: 15px;
}
.rpc-article ul {
margin-bottom: 15px;
padding-left: 20px;
}
.rpc-article li {
margin-bottom: 8px;
}
function calculateRental() {
// Get Inputs
var price = parseFloat(document.getElementById('rpcPrice').value) || 0;
var downPct = parseFloat(document.getElementById('rpcDown').value) || 0;
var rate = parseFloat(document.getElementById('rpcRate').value) || 0;
var term = parseFloat(document.getElementById('rpcTerm').value) || 0;
var closing = parseFloat(document.getElementById('rpcClosing').value) || 0;
var rent = parseFloat(document.getElementById('rpcRent').value) || 0;
var hoa = parseFloat(document.getElementById('rpcHoa').value) || 0;
var taxAnnual = parseFloat(document.getElementById('rpcTax').value) || 0;
var insAnnual = parseFloat(document.getElementById('rpcInsurance').value) || 0;
var maintPct = parseFloat(document.getElementById('rpcMaint').value) || 0;
// Calculations
var downAmount = price * (downPct / 100);
var loanAmount = price – downAmount;
// Mortgage Calculation (Monthly P&I)
var monthlyRate = (rate / 100) / 12;
var numPayments = term * 12;
var mortgage = 0;
if (rate > 0) {
mortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numPayments)) / (Math.pow(1 + monthlyRate, numPayments) – 1);
} else {
mortgage = loanAmount / numPayments;
}
// Monthly Expenses
var monthlyTax = taxAnnual / 12;
var monthlyIns = insAnnual / 12;
var monthlyMaint = rent * (maintPct / 100);
var operatingExpenses = monthlyTax + monthlyIns + hoa + monthlyMaint;
var totalMonthlyExpenses = operatingExpenses + mortgage;
// Net Operating Income (NOI)
var monthlyNOI = rent – operatingExpenses;
var annualNOI = monthlyNOI * 12;
// Cash Flow
var monthlyCashFlow = rent – totalMonthlyExpenses;
var annualCashFlow = monthlyCashFlow * 12;
// Investment Metrics
var totalInitialInvestment = downAmount + closing;
var cocReturn = 0;
var capRate = 0;
if (totalInitialInvestment > 0) {
cocReturn = (annualCashFlow / totalInitialInvestment) * 100;
}
if (price > 0) {
capRate = (annualNOI / price) * 100;
}
// Display Results
document.getElementById('resCashFlow').innerHTML = formatCurrency(monthlyCashFlow);
document.getElementById('resCashFlow').className = 'rpc-metric-value ' + (monthlyCashFlow >= 0 ? 'positive' : 'negative');
document.getElementById('resCoc').innerHTML = cocReturn.toFixed(2) + '%';
document.getElementById('resCoc').className = 'rpc-metric-value ' + (cocReturn >= 0 ? 'positive' : 'negative');
document.getElementById('resCap').innerHTML = capRate.toFixed(2) + '%';
document.getElementById('resNoi').innerHTML = formatCurrency(annualNOI);
document.getElementById('resMortgage').innerHTML = formatCurrency(mortgage);
document.getElementById('resTotalExp').innerHTML = formatCurrency(totalMonthlyExpenses);
document.getElementById('rpcResult').style.display = 'block';
}
function formatCurrency(num) {
return '$' + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
Rental Property Cash Flow Calculator
Purchase & Loan Details
Income & Expenses
Monthly Cash Flow
$0.00
Cash on Cash Return (CoC)
0.00%
Cap Rate
0.00%
Net Operating Income (Annual)
$0.00
Monthly Mortgage (P&I)
$0.00
Total Monthly Expenses
$0.00
How to Analyze a Rental Property Investment
Investing in real estate is one of the most reliable ways to build long-term wealth. However, the difference between a profitable asset and a financial burden often comes down to the numbers. Using a Rental Property Cash Flow Calculator is essential for evaluating the potential performance of a deal before you sign on the dotted line.
Key Metrics Explained
This calculator provides four critical metrics that every real estate investor should understand:
- Cash Flow: This is the net amount of money moving in or out of the business after all expenses and mortgage payments. Positive cash flow means the property pays for itself and generates profit. Ideally, you want a buffer (e.g., $200+ per month per door) to handle unexpected costs.
- Cash on Cash Return (CoC): This measures the annual return on the actual cash you invested (Down Payment + Closing Costs). Unlike pure ROI, it ignores the loan amount, focusing strictly on the efficiency of your deployed capital. A CoC of 8-12% is often considered a solid target for residential rentals.
- Cap Rate (Capitalization Rate): Cap Rate is the ratio of Net Operating Income (NOI) to the property's purchase price. It represents the potential return if you bought the property with all cash. It is useful for comparing the profitability of different properties regardless of financing terms.
- Net Operating Income (NOI): This is your total income minus operating expenses (Taxes, Insurance, HOA, Maintenance), excluding mortgage payments. Lenders look at NOI to determine if a property can support debt service.
Hidden Costs to Watch For
New investors often overestimate cash flow by ignoring "phantom" expenses. Our calculator includes a Maintenance & Vacancy field for this reason. Even if a property is currently rented and in good condition, you should budget 5-10% of rent for future repairs and 5-8% for vacancy periods when you are between tenants. Failing to account for these will lead to negative cash flow surprises down the road.
How to Use This Calculator
Start by inputting the purchase price and your financing details. Be accurate with your interest rate and loan term. Next, estimate your rental income based on comparable properties in the neighborhood (comps). Finally, input your fixed expenses like taxes, insurance, and HOA fees. The calculator will instantly determine if the deal makes financial sense, allowing you to make data-driven investment decisions.