Calculate your monthly profit, Cap Rate, and Cash-on-Cash Return.
Please enter valid positive numbers for all fields.
Monthly Cash Flow$0.00
Cash on Cash Return0.00%
Cap Rate0.00%
Monthly Income (Adjusted for Vacancy)$0.00
Monthly Expenses (Total)$0.00
Monthly Mortgage Payment$0.00
Net Operating Income (Annual)$0.00
Total Cash Invested$0.00
function calculateRentalValues() {
// 1. Retrieve all inputs
var price = parseFloat(document.getElementById('rpcPurchasePrice').value);
var downPercent = parseFloat(document.getElementById('rpcDownPayment').value);
var interestRate = parseFloat(document.getElementById('rpcInterestRate').value);
var years = parseFloat(document.getElementById('rpcLoanTerm').value);
var rent = parseFloat(document.getElementById('rpcMonthlyRent').value);
var vacancyRate = parseFloat(document.getElementById('rpcVacancy').value);
var annualTax = parseFloat(document.getElementById('rpcPropertyTax').value);
var annualInsurance = parseFloat(document.getElementById('rpcInsurance').value);
var hoa = parseFloat(document.getElementById('rpcHoa').value);
var maintenancePercent = parseFloat(document.getElementById('rpcMaintenance').value);
var managementPercent = parseFloat(document.getElementById('rpcManagement').value);
var closingCosts = parseFloat(document.getElementById('rpcClosingCosts').value);
// 2. Validation
if (isNaN(price) || isNaN(downPercent) || isNaN(interestRate) || isNaN(years) ||
isNaN(rent) || isNaN(vacancyRate) || isNaN(annualTax) || isNaN(annualInsurance) ||
isNaN(hoa) || isNaN(maintenancePercent) || isNaN(managementPercent) || isNaN(closingCosts)) {
document.getElementById('rpcError').style.display = 'block';
document.getElementById('rpcResults').style.display = 'none';
return;
}
document.getElementById('rpcError').style.display = 'none';
// 3. Calculation Logic
// Initial Investment
var downPaymentAmount = price * (downPercent / 100);
var loanAmount = price – downPaymentAmount;
var totalCashInvested = downPaymentAmount + closingCosts;
// Mortgage Calculation (Principal + Interest)
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = years * 12;
var monthlyMortgage = 0;
if (interestRate === 0) {
monthlyMortgage = loanAmount / numberOfPayments;
} else {
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1);
}
// Monthly Income Adjustments
var vacancyLoss = rent * (vacancyRate / 100);
var effectiveGrossIncome = rent – vacancyLoss;
// Monthly Expenses (Operating)
var monthlyTax = annualTax / 12;
var monthlyInsurance = annualInsurance / 12;
var maintenanceCost = rent * (maintenancePercent / 100);
var managementCost = rent * (managementPercent / 100);
var totalOperatingExpenses = monthlyTax + monthlyInsurance + hoa + maintenanceCost + managementCost;
// Net Operating Income (NOI) – Annual
// NOI = (Gross Operating Income – Operating Expenses) * 12
var monthlyNOI = effectiveGrossIncome – totalOperatingExpenses;
var annualNOI = monthlyNOI * 12;
// Cash Flow
var totalMonthlyExpenses = totalOperatingExpenses + monthlyMortgage;
var monthlyCashFlow = effectiveGrossIncome – totalMonthlyExpenses;
var annualCashFlow = monthlyCashFlow * 12;
// Returns
var capRate = (annualNOI / price) * 100;
var cashOnCash = (annualCashFlow / totalCashInvested) * 100;
// 4. Update UI
var cashFlowElement = document.getElementById('resCashFlow');
cashFlowElement.innerHTML = "$" + monthlyCashFlow.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
if (monthlyCashFlow >= 0) {
cashFlowElement.className = "rpc-result-value rpc-highlight";
cashFlowElement.style.color = "#27ae60";
} else {
cashFlowElement.className = "rpc-result-value rpc-negative";
cashFlowElement.style.color = "#c0392b";
}
document.getElementById('resCoc').innerHTML = cashOnCash.toFixed(2) + "%";
document.getElementById('resCapRate').innerHTML = capRate.toFixed(2) + "%";
document.getElementById('resIncome').innerHTML = "$" + effectiveGrossIncome.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resExpenses').innerHTML = "$" + totalMonthlyExpenses.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resMortgage').innerHTML = "$" + monthlyMortgage.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resNOI').innerHTML = "$" + annualNOI.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resInvested').innerHTML = "$" + totalCashInvested.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('rpcResults').style.display = 'block';
}
Rental Property Cash Flow Calculator: Analyze Your Investment
Investing in real estate is one of the most reliable ways to build wealth, but it requires careful analysis to ensure profitability. A Rental Property Cash Flow Calculator is an essential tool for investors to evaluate a potential property before signing on the dotted line.
This tool helps you determine if a property will generate positive cash flow (profit) after all expenses and debt service are paid. It calculates critical metrics like Net Operating Income (NOI), Cap Rate, and Cash-on-Cash Return to give you a clear picture of the investment's performance.
Understanding the Key Metrics
When analyzing rental properties, three numbers matter most:
Cash Flow: This is the money left in your pocket every month after paying the mortgage, taxes, insurance, and maintenance. Positive cash flow ensures the property pays for itself and provides income.
Cash-on-Cash Return (CoC): This measures the return on the actual cash you invested (down payment + closing costs). A CoC of 8-12% is often considered a solid benchmark for rental properties, outperforming the average stock market return.
Cap Rate (Capitalization Rate): This metric evaluates the profitability of the property regardless of how you finance it. It is calculated by dividing the Net Operating Income (NOI) by the purchase price. It helps compare properties apples-to-apples.
How to Use This Calculator
To get the most accurate results, you will need to input specific financial details about the property:
1. Purchase Details
Enter the purchase price and your financing terms. The interest rate and loan term significantly impact your monthly mortgage payment, which is usually the largest expense.
2. Rental Income
Input the gross monthly rent. Be realistic—check local listings for comparable properties. Don't forget to account for Vacancy Rate. No property is occupied 100% of the time; a standard vacancy rate is 5% to 8% depending on the market.
3. Operating Expenses
Many new investors underestimate expenses. Ensure you account for:
Property Taxes & Insurance: These are fixed annual costs.
HOA Fees: If the property is in a managed community, this can eat into profits.
Maintenance & CapEx: Set aside 5-10% of rent for repairs (leaky faucets, painting) and capital expenditures (new roof, HVAC replacement).
Property Management: If you don't plan to be a landlord yourself, expect to pay a manager 8-10% of the monthly rent.
What is a Good Cash Flow?
A "good" cash flow depends on your goals. Some investors aim for $100-$200 per door in pure profit per month, while others prioritize high appreciation potential and accept lower monthly cash flow. However, negative cash flow is a risk; it means you are paying out of pocket every month to hold the property.
Why Calculate Net Operating Income (NOI)?
NOI is the income the property generates after operating expenses but before mortgage payments. Lenders look at NOI to determine if the property generates enough income to cover the debt (DSCR loans). A higher NOI increases the property's value.
Use this calculator to tweak your numbers—try offering a lower purchase price or finding a better interest rate—to see how it affects your bottom line.