.calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 768px) {
.calc-grid {
grid-template-columns: 1fr;
}
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #333;
font-size: 14px;
}
.input-group input {
width: 100%;
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.input-group input:focus {
border-color: #0073aa;
outline: none;
}
.calc-btn {
background-color: #0073aa;
color: white;
border: none;
padding: 15px 30px;
font-size: 18px;
border-radius: 4px;
cursor: pointer;
width: 100%;
margin-top: 10px;
transition: background 0.3s;
}
.calc-btn:hover {
background-color: #005177;
}
.results-box {
background: #f8f9fa;
padding: 20px;
border-radius: 4px;
margin-top: 25px;
border-left: 5px solid #0073aa;
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 {
color: #555;
font-weight: 500;
}
.result-value {
font-weight: 700;
color: #2c3e50;
font-size: 18px;
}
.cash-flow-positive {
color: #27ae60;
}
.cash-flow-negative {
color: #c0392b;
}
.article-content {
margin-top: 40px;
line-height: 1.6;
color: #444;
}
.article-content h2 {
color: #2c3e50;
margin-top: 30px;
}
.article-content ul {
padding-left: 20px;
}
.article-content li {
margin-bottom: 10px;
}
function calculateCashFlow() {
// Get Input Values
var price = parseFloat(document.getElementById('purchasePrice').value) || 0;
var downPct = parseFloat(document.getElementById('downPayment').value) || 0;
var rate = parseFloat(document.getElementById('interestRate').value) || 0;
var term = parseFloat(document.getElementById('loanTerm').value) || 0;
var closingCosts = parseFloat(document.getElementById('closingCosts').value) || 0;
var rent = parseFloat(document.getElementById('monthlyRent').value) || 0;
var vacancyPct = parseFloat(document.getElementById('vacancyRate').value) || 0;
var tax = parseFloat(document.getElementById('annualTax').value) || 0;
var insurance = parseFloat(document.getElementById('annualInsurance').value) || 0;
var maintPct = parseFloat(document.getElementById('maintenanceRate').value) || 0;
var mgmtPct = parseFloat(document.getElementById('managementFee').value) || 0;
// Calculations
// 1. Initial Investment
var downPaymentAmt = price * (downPct / 100);
var loanAmount = price – downPaymentAmt;
var totalCashInvested = downPaymentAmt + closingCosts;
// 2. Mortgage Payment (P&I)
var monthlyRate = (rate / 100) / 12;
var totalPayments = term * 12;
var mortgagePayment = 0;
if (rate === 0) {
mortgagePayment = loanAmount / totalPayments;
} else {
mortgagePayment = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, totalPayments)) / (Math.pow(1 + monthlyRate, totalPayments) – 1);
}
if (isNaN(mortgagePayment) || !isFinite(mortgagePayment)) {
mortgagePayment = 0;
}
// 3. Monthly Expenses
var monthlyTax = tax / 12;
var monthlyIns = insurance / 12;
var vacancyCost = rent * (vacancyPct / 100);
var maintCost = rent * (maintPct / 100);
var mgmtCost = rent * (mgmtPct / 100);
var totalOpExpenses = monthlyTax + monthlyIns + vacancyCost + maintCost + mgmtCost;
// 4. Net Operating Income (NOI)
var effectiveGrossIncome = rent – vacancyCost; // NOI usually derived from Effective Gross
// Re-adjust op expenses for display (excluding vacancy which reduces gross)
var visibleOpExpenses = monthlyTax + monthlyIns + maintCost + mgmtCost + vacancyCost;
var noi = rent – visibleOpExpenses;
// 5. Cash Flow
var monthlyCashFlow = noi – mortgagePayment;
var annualCashFlow = monthlyCashFlow * 12;
// 6. Returns
var cashOnCash = 0;
if (totalCashInvested > 0) {
cashOnCash = (annualCashFlow / totalCashInvested) * 100;
}
var capRate = 0;
if (price > 0) {
capRate = ((noi * 12) / price) * 100;
}
// Display Results
document.getElementById('resGrossIncome').innerText = '$' + rent.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resOpExpenses').innerText = '$' + visibleOpExpenses.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resNOI').innerText = '$' + noi.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resMortgage').innerText = '$' + mortgagePayment.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
var cfElement = document.getElementById('resCashFlow');
cfElement.innerText = '$' + monthlyCashFlow.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
// Color coding for cash flow
if (monthlyCashFlow >= 0) {
cfElement.className = 'result-value cash-flow-positive';
} else {
cfElement.className = 'result-value cash-flow-negative';
}
document.getElementById('resCoC').innerText = cashOnCash.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}) + '%';
document.getElementById('resCapRate').innerText = capRate.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}) + '%';
document.getElementById('resInvested').innerText = '$' + totalCashInvested.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
// Show result box
document.getElementById('resultBox').style.display = 'block';
}
Rental Property Cash Flow Calculator
Purchase & Loan
Income & Expenses
Monthly Financial Performance
Gross Monthly Income:
$0.00
Operating Expenses (w/ Vacancy):
$0.00
Net Operating Income (NOI):
$0.00
Mortgage Payment (P&I):
$0.00
Monthly Cash Flow:
$0.00
Investment Returns
Cash on Cash Return (ROI):
0.00%
Cap Rate:
0.00%
Total Cash Invested:
$0.00
Understanding Rental Property Cash Flow
Successful real estate investing relies heavily on positive cash flow. This Rental Property Cash Flow Calculator helps investors analyze potential deals by breaking down income, operating expenses, and debt service to reveal the true profitability of an asset.
Key Metrics Explained
- NOI (Net Operating Income): This is your total income minus operating expenses, excluding mortgage payments. It represents the inherent profitability of the property itself.
- Cash Flow: The money left over after paying all operating expenses and the mortgage. Positive cash flow means the property is putting money in your pocket every month.
- Cash on Cash Return: A percentage that measures the annual return on the actual cash you invested (down payment + closing costs), rather than the total price of the property.
How to Calculate Rental Cash Flow
To accurately calculate cash flow, you must account for all "hidden" costs. Many new investors make the mistake of only subtracting the mortgage from the rent. However, you must also deduct:
- Vacancy Rates: The estimated percentage of time the property sits empty.
- Maintenance & CapEx: Money set aside for repairs and capital expenditures (like a new roof).
- Property Management: Even if you self-manage, it is wise to budget for this expense to see if the deal holds up as a passive investment.
Example Calculation
Imagine buying a property for $300,000 with 20% down. If the property rents for $2,500/month and your total operating expenses (taxes, insurance, vacancy, maintenance) average $800/month, your NOI is $1,700.
If your mortgage payment is $1,500, your monthly cash flow is $200. This positive cash flow ensures the asset sustains itself while potentially appreciating in value over time.