Analyze your real estate investment deal accurately.
Investment Analysis
Monthly Mortgage (P&I):$0.00
Total Monthly Expenses:$0.00
Net Operating Income (NOI) / Month:$0.00
Total Cash Invested:$0.00
Monthly Cash Flow:$0.00
Cash on Cash Return:0.00%
Cap Rate:0.00%
function calculateRental() {
// 1. Get Inputs
var price = parseFloat(document.getElementById('rc_price').value);
var downPercent = parseFloat(document.getElementById('rc_down_percent').value);
var interestRate = parseFloat(document.getElementById('rc_interest').value);
var termYears = parseFloat(document.getElementById('rc_term').value);
var closingCosts = parseFloat(document.getElementById('rc_closing').value);
var monthlyRent = parseFloat(document.getElementById('rc_rent').value);
var vacancyRate = parseFloat(document.getElementById('rc_vacancy').value);
var annualTax = parseFloat(document.getElementById('rc_tax').value);
var annualInsurance = parseFloat(document.getElementById('rc_insurance').value);
var monthlyMaint = parseFloat(document.getElementById('rc_maintenance').value);
var mgmtFeePercent = parseFloat(document.getElementById('rc_management').value);
// Validation
if (isNaN(price) || isNaN(monthlyRent) || isNaN(interestRate) || isNaN(termYears)) {
alert("Please enter valid numbers for Price, Rent, Interest Rate, and Term.");
return;
}
// 2. Calculations
// Loan Calculation
var downPaymentAmount = price * (downPercent / 100);
var loanAmount = price – downPaymentAmount;
var monthlyRate = (interestRate / 100) / 12;
var totalMonths = termYears * 12;
var monthlyMortgage = 0;
if (interestRate === 0) {
monthlyMortgage = loanAmount / totalMonths;
} else {
monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, totalMonths)) / (Math.pow(1 + monthlyRate, totalMonths) – 1);
}
// Operating Income
var vacancyLoss = monthlyRent * (vacancyRate / 100);
var effectiveGrossIncome = monthlyRent – vacancyLoss;
// Operating Expenses
var monthlyTax = annualTax / 12;
var monthlyInsurance = annualInsurance / 12;
var monthlyMgmt = monthlyRent * (mgmtFeePercent / 100); // Usually based on gross rent collected, simplified to rent
var totalMonthlyExpenses = monthlyTax + monthlyInsurance + monthlyMaint + monthlyMgmt + monthlyMortgage;
var operatingExpensesOnly = monthlyTax + monthlyInsurance + monthlyMaint + monthlyMgmt; // Excluding mortgage for NOI
// Metrics
var monthlyNOI = effectiveGrossIncome – operatingExpensesOnly;
var monthlyCashFlow = effectiveGrossIncome – totalMonthlyExpenses;
var annualCashFlow = monthlyCashFlow * 12;
var annualNOI = monthlyNOI * 12;
var totalCashInvested = downPaymentAmount + closingCosts;
var cashOnCash = 0;
if (totalCashInvested > 0) {
cashOnCash = (annualCashFlow / totalCashInvested) * 100;
}
var capRate = 0;
if (price > 0) {
capRate = (annualNOI / price) * 100;
}
// 3. Display Results
document.getElementById('res_mortgage').innerText = formatCurrency(monthlyMortgage);
document.getElementById('res_expenses').innerText = formatCurrency(totalMonthlyExpenses);
document.getElementById('res_noi').innerText = formatCurrency(monthlyNOI);
document.getElementById('res_invested').innerText = formatCurrency(totalCashInvested);
var cfElement = document.getElementById('res_cashflow');
cfElement.innerText = formatCurrency(monthlyCashFlow);
if (monthlyCashFlow >= 0) {
cfElement.className = "rental-result-value highlight-result";
} else {
cfElement.className = "rental-result-value highlight-negative";
}
var cocElement = document.getElementById('res_coc');
cocElement.innerText = cashOnCash.toFixed(2) + "%";
if (cashOnCash >= 0) {
cocElement.className = "rental-result-value highlight-result";
} else {
cocElement.className = "rental-result-value highlight-negative";
}
document.getElementById('res_caprate').innerText = capRate.toFixed(2) + "%";
// Show results
document.getElementById('rc_results').style.display = "block";
}
function formatCurrency(num) {
return "$" + num.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
}
Understanding Rental Property Cash Flow
Successful real estate investing hinges on the ability to accurately forecast the financial performance of a potential property. This Rental Property Cash Flow Calculator helps investors determine the viability of a deal by breaking down income, expenses, and financing costs.
What is Cash Flow?
Cash flow is the net amount of money moving into and out of a business. In real estate, positive cash flow means the property's income exceeds all expenses, putting money in your pocket every month.
Key Metrics Calculated
To make an informed decision, you shouldn't rely on a single number. This tool provides several critical indicators:
Net Operating Income (NOI): This represents the profitability of the property before adding in financing costs and taxes. It is calculated by subtracting operating expenses (maintenance, insurance, taxes, vacancy) from the effective gross income.
Cash on Cash Return (CoC): This is arguably the most important metric for investors using leverage. It measures the annual return on the actual cash you invested (Down Payment + Closing Costs). A common target for investors is 8-12%.
Cap Rate (Capitalization Rate): This metric compares the property's NOI to its purchase price. It helps compare properties regardless of how they are financed. Higher cap rates generally indicate higher risk or higher potential return.
How to Improve Your Cash Flow
If the calculator shows negative or low cash flow, consider these adjustments:
Negotiate the Purchase Price: A lower price reduces your loan amount and monthly mortgage payment.
Increase the Down Payment: Putting more money down reduces monthly debt service, though it may lower your Cash on Cash return initially.
Look for Value-Add Opportunities: Can you renovate to increase the rent? Higher rental income directly boosts NOI and Cash Flow.
Review Expenses: Shop around for cheaper insurance or challenge the property tax assessment to lower operating costs.
The 50% Rule and 1% Rule
While this calculator provides exact figures based on your inputs, investors often use "napkin math" rules for quick screening:
The 1% Rule: The monthly rent should be at least 1% of the purchase price. For example, a $200,000 home should rent for $2,000/month.
The 50% Rule: Assume that 50% of your rental income will go toward operating expenses (excluding the mortgage). If the remaining 50% can cover the mortgage and leave a profit, it's a good sign.
Use the calculator above to move beyond these estimates and get a precise financial picture of your next investment property.