.rp-calc-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
color: #333;
line-height: 1.6;
}
.rp-calc-container {
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
padding: 30px;
margin: 30px 0;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.rp-calc-title {
text-align: center;
margin-bottom: 25px;
color: #2c3e50;
font-size: 24px;
font-weight: 700;
}
.rp-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
.rp-input-group {
margin-bottom: 15px;
}
.rp-input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
font-size: 14px;
color: #555;
}
.rp-input-group input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box; /* Important for padding */
}
.rp-input-group input:focus {
border-color: #3498db;
outline: none;
box-shadow: 0 0 5px rgba(52,152,219,0.3);
}
.rp-section-header {
grid-column: 1 / -1;
font-size: 18px;
font-weight: bold;
color: #34495e;
margin-top: 10px;
margin-bottom: 10px;
border-bottom: 2px solid #ddd;
padding-bottom: 5px;
}
.rp-btn {
grid-column: 1 / -1;
background-color: #27ae60;
color: white;
padding: 15px;
border: none;
border-radius: 5px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s;
margin-top: 20px;
width: 100%;
}
.rp-btn:hover {
background-color: #219150;
}
.rp-result-box {
grid-column: 1 / -1;
background: #fff;
border: 1px solid #ddd;
border-radius: 5px;
padding: 20px;
margin-top: 20px;
display: none; /* Hidden by default */
}
.rp-result-row {
display: flex;
justify-content: space-between;
margin-bottom: 10px;
padding-bottom: 10px;
border-bottom: 1px solid #eee;
}
.rp-result-row.final {
border-bottom: none;
font-size: 20px;
font-weight: 800;
color: #27ae60;
margin-top: 10px;
}
.rp-result-row.negative {
color: #c0392b;
}
.rp-result-label {
font-weight: 600;
}
@media (max-width: 600px) {
.rp-grid {
grid-template-columns: 1fr;
}
}
function calculateRentalCashFlow() {
// 1. Get Input Values
var price = parseFloat(document.getElementById('rp_price').value);
var downPct = parseFloat(document.getElementById('rp_down_pct').value);
var interestRate = parseFloat(document.getElementById('rp_rate').value);
var termYears = parseFloat(document.getElementById('rp_term').value);
var rent = parseFloat(document.getElementById('rp_rent').value);
var vacancyPct = parseFloat(document.getElementById('rp_vacancy').value);
var taxAnnual = parseFloat(document.getElementById('rp_tax').value);
var insAnnual = parseFloat(document.getElementById('rp_insurance').value);
var maintMonthly = parseFloat(document.getElementById('rp_maintenance').value);
var hoaMonthly = parseFloat(document.getElementById('rp_hoa').value);
var mgmtPct = parseFloat(document.getElementById('rp_mgmt').value);
// Validation
if (isNaN(price) || isNaN(rent) || isNaN(downPct)) {
alert("Please enter valid numbers for Purchase Price, Down Payment, and Rent.");
return;
}
// 2. Calculate Mortgage (Principal + Interest)
var downAmount = price * (downPct / 100);
var loanAmount = price – downAmount;
var monthlyRate = (interestRate / 100) / 12;
var totalPayments = termYears * 12;
var monthlyMortgage = 0;
if (interestRate === 0) {
monthlyMortgage = loanAmount / totalPayments;
} else {
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, totalPayments)) / (Math.pow(1 + monthlyRate, totalPayments) – 1);
}
// 3. Calculate Monthly Expenses (Operating)
var monthlyTax = taxAnnual / 12;
var monthlyIns = insAnnual / 12;
var monthlyMgmt = rent * (mgmtPct / 100);
var totalMonthlyOpEx = monthlyTax + monthlyIns + maintMonthly + hoaMonthly + monthlyMgmt;
// 4. Calculate Income
var vacancyLoss = rent * (vacancyPct / 100);
var effectiveIncome = rent – vacancyLoss;
// 5. Calculate Cash Flow
var totalOutflow = monthlyMortgage + totalMonthlyOpEx;
var monthlyCashFlow = effectiveIncome – totalOutflow;
var annualCashFlow = monthlyCashFlow * 12;
// 6. Calculate Cash on Cash Return
// Initial Investment = Down Payment (simplified, ignoring closing costs for this basic calc)
var initialInvestment = downAmount;
var cocReturn = 0;
if (initialInvestment > 0) {
cocReturn = (annualCashFlow / initialInvestment) * 100;
}
// 7. Update DOM
document.getElementById('res_mortgage').innerText = "$" + monthlyMortgage.toFixed(2);
document.getElementById('res_opex').innerText = "$" + totalMonthlyOpEx.toFixed(2);
document.getElementById('res_income').innerText = "$" + effectiveIncome.toFixed(2);
var cfElement = document.getElementById('res_cashflow');
var cfRow = document.getElementById('row_cashflow');
cfElement.innerText = "$" + monthlyCashFlow.toFixed(2);
document.getElementById('res_annual_cashflow').innerText = "$" + annualCashFlow.toFixed(2);
document.getElementById('res_coc').innerText = cocReturn.toFixed(2) + "%";
// Color coding for positive/negative cash flow
if (monthlyCashFlow < 0) {
cfRow.style.color = "#c0392b";
} else {
cfRow.style.color = "#27ae60";
}
// Show result box
document.getElementById('rp_result_box').style.display = 'block';
}
Rental Property Cash Flow Calculator
Purchase & Loan Details
Income Details
Recurring Expenses
Monthly Mortgage (P&I):
$0.00
Total Monthly Expenses (w/o Mortgage):
$0.00
Effective Monthly Income (after Vacancy):
$0.00
Net Monthly Cash Flow:
$0.00
Annual Cash Flow:
$0.00
Cash on Cash Return (ROI):
0.00%
Understanding Rental Property Cash Flow
Investing in real estate is one of the most reliable ways to build wealth, but the difference between a successful investment and a financial burden often comes down to one metric: Cash Flow. This Rental Property Cash Flow Calculator is designed to help investors accurately project the profitability of a potential purchase.
What is Cash Flow?
Cash flow represents the net amount of money moving in and out of a business or investment. In real estate terms, it is the money left over from your rental income after all operating expenses and debt service (mortgage payments) have been paid. Positive cash flow means the property is putting money into your pocket every month, while negative cash flow means you are paying out of pocket to hold the asset.
How to Use This Calculator
To get the most accurate results, you need to input specific data regarding the property and financing. Here is a breakdown of the fields used in the calculator:
- Purchase Price & Down Payment: These determine your loan amount. A higher down payment reduces your monthly mortgage, thereby increasing cash flow.
- Vacancy Rate: Properties are rarely occupied 365 days a year. A standard vacancy rate is 5% to 8%, accounting for turnover periods between tenants.
- Maintenance & Repairs: Even if the house is new, things break. It is prudent to budget 1% of the property value annually or a fixed monthly amount (e.g., $150) for repairs.
- Property Management: If you hire a professional company to manage tenants, they typically charge 8% to 10% of the monthly rent. If you self-manage, enter 0.
- Cash on Cash Return (CoC): This is a crucial ROI metric. It measures the annual cash income earned on the cash you actually invested (your down payment). A good CoC return varies by market but often ranges from 8% to 12% or higher.
Example Scenario
Imagine you purchase a property for $250,000 with a 20% down payment ($50,000). You secure a loan at 6.5% interest for 30 years.
If you rent the property for $2,200/month, but have to pay property taxes, insurance, and set aside money for maintenance, your total expenses might eat up a significant portion of that rent. Using the calculator above, you can determine if the remaining margin justifies the risk of the investment.
Disclaimer: This calculator is for educational purposes only. Always consult with a financial advisor or real estate professional before making investment decisions.