Analyze the potential profitability of your real estate investment.
Monthly Cash Flow:$0.00
Cash on Cash Return (CoC):0.00%
Cap Rate:0.00%
Net Operating Income (Annual):$0.00
Total Cash Invested:$0.00
Monthly Mortgage (P&I):$0.00
function calculateRentalROI() {
// 1. Get Inputs
var price = parseFloat(document.getElementById("purchasePrice").value) || 0;
var downPercent = parseFloat(document.getElementById("downPaymentPercent").value) || 0;
var interestRate = parseFloat(document.getElementById("interestRate").value) || 0;
var termYears = parseFloat(document.getElementById("loanTerm").value) || 0;
var closingCosts = parseFloat(document.getElementById("closingCosts").value) || 0;
var rent = parseFloat(document.getElementById("monthlyRent").value) || 0;
var tax = parseFloat(document.getElementById("annualTaxes").value) || 0;
var insurance = parseFloat(document.getElementById("annualInsurance").value) || 0;
var maintPercent = parseFloat(document.getElementById("maintenance").value) || 0;
var vacancyPercent = parseFloat(document.getElementById("vacancy").value) || 0;
// 2. Initial Calculations (Purchase)
var downPaymentAmount = price * (downPercent / 100);
var loanAmount = price – downPaymentAmount;
var totalInvested = downPaymentAmount + closingCosts;
// 3. Mortgage Calculation (Monthly P&I)
var monthlyRate = (interestRate / 100) / 12;
var totalPayments = termYears * 12;
var monthlyMortgage = 0;
if (interestRate > 0) {
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, totalPayments)) / (Math.pow(1 + monthlyRate, totalPayments) – 1);
} else {
monthlyMortgage = loanAmount / totalPayments;
}
// 4. Income Calculations (Annual)
var grossAnnualRent = rent * 12;
var vacancyLoss = grossAnnualRent * (vacancyPercent / 100);
var effectiveGrossIncome = grossAnnualRent – vacancyLoss;
// 5. Expense Calculations (Annual)
var maintenanceCost = grossAnnualRent * (maintPercent / 100);
var operatingExpenses = tax + insurance + maintenanceCost;
// 6. Metric Calculations
var noi = effectiveGrossIncome – operatingExpenses; // Net Operating Income
var annualDebtService = monthlyMortgage * 12;
var annualCashFlow = noi – annualDebtService;
var monthlyCashFlow = annualCashFlow / 12;
var capRate = (noi / price) * 100;
var cocReturn = (annualCashFlow / totalInvested) * 100;
// 7. Display Results
// Helper function for currency formatting
var fmtMoney = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD' });
document.getElementById("monthlyCashFlow").innerText = fmtMoney.format(monthlyCashFlow);
document.getElementById("monthlyCashFlow").style.color = monthlyCashFlow >= 0 ? "#27ae60" : "#c0392b";
document.getElementById("cocReturn").innerText = cocReturn.toFixed(2) + "%";
document.getElementById("cocReturn").style.color = cocReturn >= 0 ? "#27ae60" : "#c0392b";
document.getElementById("capRate").innerText = capRate.toFixed(2) + "%";
document.getElementById("noiAnnual").innerText = fmtMoney.format(noi);
document.getElementById("totalInvested").innerText = fmtMoney.format(totalInvested);
document.getElementById("monthlyMortgage").innerText = fmtMoney.format(monthlyMortgage);
// Show the result section
document.getElementById("resultsArea").style.display = "block";
}
Why Use a Rental Property ROI Calculator?
Investing in real estate is one of the most reliable ways to build wealth, but it requires precise math. A Rental Property ROI Calculator helps investors distinguish between a lucrative asset and a money pit. By analyzing factors like cash flow, cap rate, and cash-on-cash return, you can make data-driven decisions rather than relying on gut feelings.
Understanding the Key Metrics
When evaluating a rental property, there are three primary metrics you should focus on:
Cash Flow: This is the net amount of money moving into or out of your business after all expenses and mortgage payments are made. Positive cash flow is essential for long-term sustainability.
Cash on Cash Return (CoC): This measures the annual return on the actual cash you invested (down payment + closing costs), rather than the total purchase price. It is arguably the most important metric for investors using leverage.
Cap Rate (Capitalization Rate): This metric helps you compare the profitability of different properties irrespective of financing. It is calculated by dividing the Net Operating Income (NOI) by the property's purchase price.
How to Calculate Rental Property Profitability
To accurately calculate your potential returns, you must account for all expenses, not just the obvious ones like the mortgage payment. Here is a breakdown of the expenses used in our calculator:
1. Operating Expenses
These are the costs required to keep the property running. They include:
Property Taxes & Insurance: These are fixed annual costs.
Maintenance: Even if a house is new, you should budget 1% of the property value or 5-10% of the rent annually for repairs.
Vacancy Rate: You won't have a tenant 100% of the time. Budgeting 5-8% for vacancy ensures you aren't caught off guard during turnover periods.
2. Net Operating Income (NOI)
The NOI is your total rental income minus all operating expenses. Note that NOI does not include mortgage payments. This figure is crucial for calculating the Cap Rate.
What is a Good ROI for Rental Property?
While "good" is subjective, many investors aim for a Cash on Cash return of 8-12%. In highly appreciative markets, investors might accept a lower cash flow (4-6%) in exchange for long-term equity growth. Conversely, in stable markets with low appreciation, investors often demand higher immediate cash flow.
Use the calculator above to adjust your down payment, interest rate, and rental assumptions to see how different scenarios impact your bottom line.