.calculator-container {
max-width: 800px;
margin: 0 auto;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background: #fff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}
.calc-header {
text-align: center;
margin-bottom: 30px;
border-bottom: 2px solid #f0f0f0;
padding-bottom: 10px;
}
.calc-header h2 {
color: #2c3e50;
margin: 0;
}
.input-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 600px) {
.input-grid {
grid-template-columns: 1fr;
}
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #555;
font-size: 0.9em;
}
.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: #3498db;
outline: none;
}
.input-suffix {
position: relative;
}
.input-suffix input {
padding-right: 30px;
}
.input-suffix span {
position: absolute;
right: 10px;
top: 10px;
color: #888;
}
.calc-btn-wrapper {
text-align: center;
margin-top: 20px;
}
.calc-btn {
background-color: #27ae60;
color: white;
border: none;
padding: 12px 30px;
font-size: 18px;
border-radius: 5px;
cursor: pointer;
transition: background 0.3s;
}
.calc-btn:hover {
background-color: #219150;
}
.results-section {
background-color: #f8f9fa;
padding: 20px;
margin-top: 30px;
border-radius: 6px;
border-left: 5px solid #27ae60;
}
.result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #e9ecef;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
font-weight: 600;
color: #444;
}
.result-value {
font-weight: 700;
color: #2c3e50;
font-size: 1.1em;
}
.highlight-result {
color: #27ae60;
font-size: 1.3em;
}
.article-content {
margin-top: 50px;
line-height: 1.6;
color: #333;
}
.article-content h3 {
color: #2c3e50;
margin-top: 30px;
}
.article-content p {
margin-bottom: 15px;
}
.metric-card {
background: #eef2f7;
padding: 15px;
border-radius: 5px;
margin-bottom: 15px;
}
function calculateRentalROI() {
// 1. Get Inputs
var price = parseFloat(document.getElementById('purchasePrice').value);
var downPayment = parseFloat(document.getElementById('downPayment').value);
var interestRate = parseFloat(document.getElementById('interestRate').value);
var termYears = parseFloat(document.getElementById('loanTerm').value);
var rent = parseFloat(document.getElementById('monthlyRent').value);
var fixedExpenses = parseFloat(document.getElementById('monthlyExpenses').value);
var vacancyRate = parseFloat(document.getElementById('vacancyRate').value);
var repairRate = parseFloat(document.getElementById('repairRate').value);
// Validation
if (isNaN(price) || isNaN(downPayment) || isNaN(rent) || isNaN(interestRate) || isNaN(termYears)) {
alert("Please ensure all fields contain valid numbers.");
return;
}
// 2. Mortgage Calculation (Principal & Interest)
var loanAmount = price – downPayment;
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = termYears * 12;
var monthlyMortgage = 0;
if (interestRate > 0) {
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1);
} else {
monthlyMortgage = loanAmount / numberOfPayments;
}
// 3. Operational Expenses Calculation
var monthlyVacancyCost = rent * (vacancyRate / 100);
var monthlyRepairCost = rent * (repairRate / 100);
// Total Operating Expenses (Expenses + Vacancy + Repairs, EXCLUDING Mortgage)
var operatingExpenses = fixedExpenses + monthlyVacancyCost + monthlyRepairCost;
// Total Outflow (Operating + Mortgage)
var totalMonthlyOutflow = operatingExpenses + monthlyMortgage;
// 4. Key Metrics Calculation
// NOI = Income – Operating Expenses (Before Mortgage)
var monthlyNOI = rent – operatingExpenses;
var annualNOI = monthlyNOI * 12;
// Cash Flow = Income – Total Outflow
var monthlyCashFlow = rent – totalMonthlyOutflow;
var annualCashFlow = monthlyCashFlow * 12;
// Cap Rate = (Annual NOI / Purchase Price) * 100
var capRate = (annualNOI / price) * 100;
// Cash on Cash Return = (Annual Cash Flow / Total Cash Invested) * 100
// Assuming Cash Invested is just Down Payment for this simple calc (could add closing costs)
var cashInvested = downPayment;
var cashOnCash = 0;
if (cashInvested > 0) {
cashOnCash = (annualCashFlow / cashInvested) * 100;
}
// 5. Update UI
document.getElementById('dispMortgage').innerHTML = "$" + monthlyMortgage.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('dispTotalExp').innerHTML = "$" + totalMonthlyOutflow.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('dispMonthlyNOI').innerHTML = "$" + monthlyNOI.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
var cashFlowElem = document.getElementById('dispCashFlow');
cashFlowElem.innerHTML = "$" + monthlyCashFlow.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
cashFlowElem.style.color = monthlyCashFlow >= 0 ? '#27ae60' : '#c0392b';
document.getElementById('dispAnnualCF').innerHTML = "$" + annualCashFlow.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('dispCapRate').innerHTML = capRate.toFixed(2) + "%";
var cocElem = document.getElementById('dispCoC');
cocElem.innerHTML = cashOnCash.toFixed(2) + "%";
cocElem.style.color = cashOnCash >= 0 ? '#27ae60' : '#c0392b';
document.getElementById('resultsArea').style.display = "block";
}
Rental Property ROI Calculator
Analyze cash flow, cap rate, and cash-on-cash return for your real estate investment.
%
(Taxes, Insurance, HOA)
%
%
Investment Analysis
Monthly Mortgage Payment (P&I):
$0.00
Total Monthly Expenses:
$0.00
Monthly Net Operating Income (NOI):
$0.00
Monthly Cash Flow:
$0.00
Annual Cash Flow:
$0.00
Cap Rate:
0.00%
Cash on Cash Return (CoC):
0.00%
Understanding Rental Property ROI
Investing in real estate requires precise calculations to ensure a property will generate profit. This Rental Property ROI Calculator helps investors analyze the financial performance of a potential buy-and-hold asset by breaking down income, expenses, and key return metrics.
Key Metrics Explained
Cash Flow:
This is the profit remaining after all expenses and mortgage payments are made. Positive cash flow is essential for a sustainable rental business. It is calculated as: Gross Rent – (Mortgage + Taxes + Insurance + HOA + Maintenance + Vacancy).
This is the profit remaining after all expenses and mortgage payments are made. Positive cash flow is essential for a sustainable rental business. It is calculated as: Gross Rent – (Mortgage + Taxes + Insurance + HOA + Maintenance + Vacancy).
Cash on Cash Return (CoC):
This metric measures the annual return on the actual cash you invested (down payment). It gives a better picture of your money's velocity compared to generic stock market returns. A generic rule of thumb for many investors is to aim for 8-12% CoC.
This metric measures the annual return on the actual cash you invested (down payment). It gives a better picture of your money's velocity compared to generic stock market returns. A generic rule of thumb for many investors is to aim for 8-12% CoC.
Cap Rate (Capitalization Rate):
Cap Rate evaluates the profitability of a property regardless of how it is financed. It is calculated by dividing the Net Operating Income (NOI) by the property price. It is useful for comparing the raw potential of different properties.
Cap Rate evaluates the profitability of a property regardless of how it is financed. It is calculated by dividing the Net Operating Income (NOI) by the property price. It is useful for comparing the raw potential of different properties.
Why Factor in Vacancy and Repairs?
Novice investors often make the mistake of calculating ROI based solely on rent minus mortgage. However, real life incurs "phantom costs":
- Vacancy Rate: Properties will not be occupied 100% of the time. Setting aside 5% to 8% of monthly rent ensures you have a buffer for turnover periods.
- Maintenance Reserve: Water heaters break and roofs leak. Allocating 5% to 10% of income for repairs prevents cash flow shock when capital expenditures arise.
Use the calculator above to adjust these variables and stress-test your investment deal before making an offer.