.rp-calc-wrapper {
max-width: 800px;
margin: 20px auto;
padding: 25px;
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.rp-calc-header {
text-align: center;
margin-bottom: 25px;
}
.rp-calc-header h2 {
color: #2c3e50;
margin-bottom: 10px;
}
.rp-input-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
.rp-input-grid {
grid-template-columns: 1fr;
}
}
.rp-input-group {
display: flex;
flex-direction: column;
}
.rp-input-group label {
font-weight: 600;
font-size: 14px;
color: #555;
margin-bottom: 5px;
}
.rp-input-group input {
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
}
.rp-section-title {
grid-column: 1 / -1;
font-size: 18px;
font-weight: bold;
color: #2980b9;
margin-top: 15px;
border-bottom: 2px solid #2980b9;
padding-bottom: 5px;
}
.rp-calc-btn {
grid-column: 1 / -1;
background-color: #27ae60;
color: white;
border: none;
padding: 15px;
font-size: 18px;
font-weight: bold;
border-radius: 5px;
cursor: pointer;
margin-top: 20px;
transition: background 0.3s;
}
.rp-calc-btn:hover {
background-color: #219150;
}
.rp-results-container {
margin-top: 30px;
background: #fff;
padding: 20px;
border-radius: 5px;
border: 1px solid #ddd;
display: none;
}
.rp-result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.rp-result-row:last-child {
border-bottom: none;
}
.rp-result-label {
color: #555;
font-weight: 500;
}
.rp-result-value {
font-weight: bold;
color: #2c3e50;
}
.rp-highlight {
color: #27ae60;
font-size: 1.1em;
}
.rp-article-content {
max-width: 800px;
margin: 40px auto;
font-family: inherit;
line-height: 1.6;
color: #333;
}
.rp-article-content h2 {
color: #2c3e50;
border-bottom: 1px solid #eee;
padding-bottom: 10px;
}
.rp-article-content h3 {
color: #2980b9;
margin-top: 25px;
}
.rp-article-content ul {
margin-bottom: 20px;
padding-left: 20px;
}
.rp-article-content p {
margin-bottom: 15px;
}
Investment Analysis
Monthly Net Cash Flow
—
Annual Net Cash Flow
—
Cash on Cash Return (CoC)
—
Cap Rate
—
Net Operating Income (NOI) / Yr
—
Total Cash Needed to Close
—
Monthly Mortgage Payment (P&I)
—
Total Monthly Expenses
—
function calculateRental() {
// 1. Get Values
var price = parseFloat(document.getElementById('purchasePrice').value) || 0;
var downPercent = parseFloat(document.getElementById('downPayment').value) || 0;
var rate = parseFloat(document.getElementById('interestRate').value) || 0;
var years = parseFloat(document.getElementById('loanTerm').value) || 0;
var closingCosts = parseFloat(document.getElementById('closingCosts').value) || 0;
var rent = parseFloat(document.getElementById('monthlyRent').value) || 0;
var vacancyPercent = parseFloat(document.getElementById('vacancyRate').value) || 0;
var taxYear = parseFloat(document.getElementById('annualTax').value) || 0;
var insYear = parseFloat(document.getElementById('annualInsurance').value) || 0;
var mgmtPercent = parseFloat(document.getElementById('mgmtFee').value) || 0;
var maintMonth = parseFloat(document.getElementById('maintenance').value) || 0;
var hoaMonth = parseFloat(document.getElementById('hoa').value) || 0;
// 2. Calculations – Loan
var downAmount = price * (downPercent / 100);
var loanAmount = price – downAmount;
var monthlyRate = rate / 100 / 12;
var numPayments = years * 12;
var monthlyMortgage = 0;
if (rate > 0) {
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numPayments)) / (Math.pow(1 + monthlyRate, numPayments) – 1);
} else {
monthlyMortgage = loanAmount / numPayments;
}
// 3. Calculations – Operating Expenses
var vacancyCost = rent * (vacancyPercent / 100);
var mgmtCost = rent * (mgmtPercent / 100);
var taxMonth = taxYear / 12;
var insMonth = insYear / 12;
// Total Operating Expenses (Excluding Mortgage)
var operatingExpensesMonth = taxMonth + insMonth + hoaMonth + maintMonth + vacancyCost + mgmtCost;
// Total Expenses (Including Mortgage)
var totalExpensesMonth = operatingExpensesMonth + monthlyMortgage;
// 4. Calculations – Income & Returns
var netOperatingIncomeMonth = rent – operatingExpensesMonth; // NOI
var cashFlowMonth = rent – totalExpensesMonth;
var cashFlowYear = cashFlowMonth * 12;
var noiYear = netOperatingIncomeMonth * 12;
var totalCashInvested = downAmount + closingCosts;
var cocReturn = 0;
if (totalCashInvested > 0) {
cocReturn = (cashFlowYear / totalCashInvested) * 100;
}
var capRate = 0;
if (price > 0) {
capRate = (noiYear / price) * 100;
}
// 5. Display Results
document.getElementById('monthlyCashFlow').innerHTML = "$" + cashFlowMonth.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ",");
document.getElementById('annualCashFlow').innerHTML = "$" + cashFlowYear.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ",");
document.getElementById('cocReturn').innerHTML = cocReturn.toFixed(2) + "%";
document.getElementById('capRate').innerHTML = capRate.toFixed(2) + "%";
document.getElementById('noiYear').innerHTML = "$" + noiYear.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ",");
document.getElementById('totalCashInvested').innerHTML = "$" + totalCashInvested.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ",");
document.getElementById('mortgagePayment').innerHTML = "$" + monthlyMortgage.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ",");
document.getElementById('totalExpenses').innerHTML = "$" + totalExpensesMonth.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ",");
// Show result box
document.getElementById('results').style.display = "block";
}
Understanding Rental Property Cash Flow
Calculating the potential profitability of a real estate investment is crucial before signing any contracts. This Rental Property Cash Flow Calculator helps investors determine whether a specific property will generate positive income or result in a monthly loss. By analyzing key metrics like Cash on Cash Return (CoC) and Cap Rate, you can compare different investment opportunities objectively.
What is Positive Cash Flow?
Positive cash flow occurs when a property's gross rental income exceeds all of its expenses, including the mortgage, taxes, insurance, and operating costs. A positive cash flow ensures that the property pays for itself and provides profit to the owner. Conversely, negative cash flow means the owner must pay out of pocket every month to keep the property running, which is generally considered a risky investment strategy.
Key Metrics Explained
- Net Operating Income (NOI): This is the total income generated by the property minus all operating expenses. Crucially, NOI excludes mortgage payments. It represents the profitability of the property itself, regardless of financing.
- Cash on Cash Return (CoC): This metric calculates the annual return you earn on the actual cash you invested (Down Payment + Closing Costs). It is often considered the most important metric for investors using leverage (mortgages). A CoC return of 8-12% is often considered a strong target for residential rentals.
- Cap Rate (Capitalization Rate): Calculated as NOI divided by the Purchase Price. The Cap Rate helps compare the profitability of properties with different prices and indicates the potential return if you bought the property entirely with cash.
How to Estimate Expenses
One of the biggest mistakes new investors make is underestimating expenses. When using this calculator, be sure to account for:
- Vacancy Rate: Properties are rarely occupied 365 days a year. A standard assumption is 5-8% vacancy (roughly 2-3 weeks per year).
- Maintenance & Repairs: Even if a house is new, things break. Setting aside 5-10% of the rent for future repairs is a prudent financial habit.
- Management Fees: If you hire a property manager, they typically charge 8-10% of the monthly rent. If you manage it yourself, you should still account for this "cost" as it represents the value of your time.
Using the Calculator
Input your purchase details, financing terms, and estimated rental income above. Be realistic with your numbers. It is always better to estimate expenses slightly higher and income slightly lower to ensure a margin of safety in your investment analysis.