#rental-calculator-wrapper .calc-container {
background: #f9f9f9;
padding: 30px;
border-radius: 8px;
box-shadow: 0 4px 15px rgba(0,0,0,0.1);
margin-bottom: 40px;
border: 1px solid #e0e0e0;
}
#rental-calculator-wrapper .calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
#rental-calculator-wrapper .calc-grid {
grid-template-columns: 1fr;
}
}
#rental-calculator-wrapper .input-group {
margin-bottom: 15px;
}
#rental-calculator-wrapper label {
display: block;
margin-bottom: 5px;
font-weight: 600;
font-size: 0.9em;
color: #2c3e50;
}
#rental-calculator-wrapper input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
#rental-calculator-wrapper input:focus {
border-color: #27ae60;
outline: none;
box-shadow: 0 0 5px rgba(39, 174, 96, 0.3);
}
#rental-calculator-wrapper .section-title {
grid-column: 1 / -1;
margin-top: 10px;
margin-bottom: 10px;
font-size: 1.1em;
color: #27ae60;
border-bottom: 2px solid #27ae60;
padding-bottom: 5px;
}
#rental-calculator-wrapper button.calc-btn {
grid-column: 1 / -1;
background-color: #27ae60;
color: white;
padding: 15px;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background 0.3s;
margin-top: 10px;
}
#rental-calculator-wrapper button.calc-btn:hover {
background-color: #219150;
}
#rental-calculator-wrapper #results-area {
display: none;
grid-column: 1 / -1;
background: #fff;
padding: 20px;
border-radius: 4px;
border-left: 5px solid #27ae60;
margin-top: 20px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
#rental-calculator-wrapper .result-row {
display: flex;
justify-content: space-between;
padding: 8px 0;
border-bottom: 1px solid #eee;
}
#rental-calculator-wrapper .result-row:last-child {
border-bottom: none;
}
#rental-calculator-wrapper .result-label {
font-weight: 500;
}
#rental-calculator-wrapper .result-value {
font-weight: 700;
color: #2c3e50;
}
#rental-calculator-wrapper .highlight-result {
color: #27ae60;
font-size: 1.2em;
}
#rental-calculator-wrapper .negative {
color: #c0392b;
}
/* SEO Content Styling */
#rental-calculator-wrapper .seo-content h2 {
font-size: 24px;
margin-top: 30px;
color: #2c3e50;
}
#rental-calculator-wrapper .seo-content h3 {
font-size: 20px;
margin-top: 20px;
color: #34495e;
}
#rental-calculator-wrapper .seo-content p {
margin-bottom: 15px;
}
#rental-calculator-wrapper .seo-content ul {
margin-bottom: 20px;
padding-left: 20px;
}
#rental-calculator-wrapper .seo-content li {
margin-bottom: 8px;
}
function calculateRentalROI() {
// Get Input Values
var price = parseFloat(document.getElementById('purchasePrice').value) || 0;
var down = parseFloat(document.getElementById('downPayment').value) || 0;
var rate = parseFloat(document.getElementById('interestRate').value) || 0;
var years = parseFloat(document.getElementById('loanTerm').value) || 0;
var closing = parseFloat(document.getElementById('closingCosts').value) || 0;
var reno = parseFloat(document.getElementById('renovationCosts').value) || 0;
var rent = parseFloat(document.getElementById('monthlyRent').value) || 0;
var vacancy = parseFloat(document.getElementById('vacancyRate').value) || 0;
var tax = parseFloat(document.getElementById('annualTax').value) || 0;
var insurance = parseFloat(document.getElementById('annualInsurance').value) || 0;
var maint = parseFloat(document.getElementById('monthlyMaintenance').value) || 0;
var hoa = parseFloat(document.getElementById('monthlyHOA').value) || 0;
// 1. Calculate Mortgage
var loanAmount = price – down;
var monthlyRate = (rate / 100) / 12;
var numPayments = years * 12;
var monthlyMortgage = 0;
if (rate > 0 && years > 0) {
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numPayments)) / (Math.pow(1 + monthlyRate, numPayments) – 1);
} else if (rate === 0 && years > 0) {
monthlyMortgage = loanAmount / numPayments;
}
// 2. Income Calculations
var grossAnnualRent = rent * 12;
var vacancyLoss = grossAnnualRent * (vacancy / 100);
var effectiveGrossIncome = grossAnnualRent – vacancyLoss;
// 3. Expense Calculations (Operating)
// Note: Mortgage is Debt Service, not Operating Expense for NOI calculations
var annualOperatingExpenses = tax + insurance + (maint * 12) + (hoa * 12);
// 4. Net Operating Income (NOI)
var noi = effectiveGrossIncome – annualOperatingExpenses;
// 5. Cash Flow
var annualDebtService = monthlyMortgage * 12;
var annualCashFlow = noi – annualDebtService;
var monthlyCashFlow = annualCashFlow / 12;
// 6. Investment Returns
var totalInitialInvestment = down + closing + reno;
var cocReturn = 0;
if (totalInitialInvestment > 0) {
cocReturn = (annualCashFlow / totalInitialInvestment) * 100;
}
var capRate = 0;
if (price > 0) {
capRate = (noi / price) * 100;
}
// Display Results
document.getElementById('results-area').style.display = 'block';
// Helper for currency formatting
var fmtMoney = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' });
document.getElementById('res-monthly-cashflow').innerText = fmtMoney.format(monthlyCashFlow);
document.getElementById('res-annual-cashflow').innerText = fmtMoney.format(annualCashFlow);
document.getElementById('res-coc-return').innerText = cocReturn.toFixed(2) + "%";
document.getElementById('res-cap-rate').innerText = capRate.toFixed(2) + "%";
document.getElementById('res-noi').innerText = fmtMoney.format(noi);
document.getElementById('res-total-investment').innerText = fmtMoney.format(totalInitialInvestment);
document.getElementById('res-mortgage').innerText = fmtMoney.format(monthlyMortgage);
// Styling adjustments for negative flow
var flowEl = document.getElementById('res-monthly-cashflow');
if (monthlyCashFlow < 0) {
flowEl.classList.add('negative');
flowEl.classList.remove('highlight-result');
} else {
flowEl.classList.remove('negative');
flowEl.classList.add('highlight-result');
}
}
Rental Property Cash Flow Calculator
Purchase Information
Income & Expenses
Investment Analysis
Monthly Net Cash Flow:
$0.00
Annual Net Cash Flow:
$0.00
Cash on Cash Return (ROI):
0.00%
Cap Rate:
0.00%
Net Operating Income (NOI):
$0.00
Total Initial Investment:
$0.00
Monthly Mortgage P&I:
$0.00
Understanding Rental Property ROI
Investing in real estate is a proven strategy for building wealth, but not every property is a good deal. To ensure your investment pays off, you must look beyond the monthly rent check and analyze the profitability using specific financial metrics. This Rental Property Cash Flow Calculator helps you evaluate the potential return on investment (ROI) by factoring in income, operating expenses, and debt service.
Key Metrics Explained
When analyzing a rental property, two metrics are paramount:
- Cash on Cash Return (CoC): This measures the annual return on the actual cash you invested (down payment, closing costs, and renovations). It gives you a realistic view of how hard your money is working. A CoC return of 8-12% is often considered a solid target for investors.
- Cap Rate (Capitalization Rate): This measures the property's natural rate of return assuming you bought it with all cash. It is calculated by dividing the Net Operating Income (NOI) by the Purchase Price. Cap Rate is excellent for comparing properties regardless of how they are financed.
- Net Operating Income (NOI): This is your total income (rent minus vacancy) minus operating expenses (taxes, insurance, maintenance). Crucially, NOI excludes mortgage payments.
How to Calculate Cash Flow
Your monthly cash flow is the profit you keep after all bills are paid. The formula used in this calculator is:
Cash Flow = (Gross Rent – Vacancy Allowance) – (Operating Expenses + Mortgage Payments)
Ideally, you want a property that generates positive cash flow from day one. Negative cash flow implies you are losing money every month just to hold the property, banking solely on future appreciation—a risky strategy known as speculation.
Example Scenario
Imagine purchasing a property for $200,000 with a 20% down payment ($40,000). If you rent it for $1,800/month and your total monthly expenses (mortgage, tax, insurance, maintenance) equal $1,400, your net positive cash flow is $400/month. Over a year, that is $4,800 in profit. Your Cash on Cash return would be roughly 12% ($4,800 divided by your $40k investment), representing a very healthy investment.
Tips for Accurate Calculations
Many new investors underestimate expenses. Always include a Vacancy Rate (usually 5-8% depending on the market) to account for turnover periods where the unit sits empty. Additionally, set aside money for Maintenance and Capital Expenditures (CapEx), such as replacing a roof or water heater, even if you don't spend that money every month.