Calculate Contract Rate to Salary

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Rental Property ROI Calculator

Investment Analysis

Monthly Mortgage P&I:
Total Monthly Expenses:
Monthly Cash Flow:
Net Operating Income (Annual):
Cap Rate:
Cash on Cash Return:

How to Calculate Rental Property ROI

Calculating the Return on Investment (ROI) for a rental property involves analyzing several financial metrics to determine the profitability of the asset. Unlike a simple savings account, real estate involves leverage (debt), operating expenses, and tax implications.

Key Metrics Explained

  • Cash Flow: This is the net amount of money moving in or out of the investment monthly. It is calculated by subtracting the mortgage payment and operating expenses from the rental income.
  • Net Operating Income (NOI): This calculates the profitability of the property excluding debt service. It is essential for determining the Cap Rate. Formula: Income – Operating Expenses.
  • Cap Rate (Capitalization Rate): This metric compares the property's purchase price to the income it generates. It helps investors compare properties regardless of financing methods.
  • Cash on Cash Return: This is arguably the most important metric for leveraged investors. It measures the annual pre-tax cash flow against the actual cash invested (down payment + closing costs).

Example Scenario

Imagine you purchase a single-family home for $250,000 with a $50,000 down payment. You rent it out for $2,200/month.

If your annual expenses (taxes, insurance, maintenance) are $6,200 and your annual mortgage payments total roughly $15,180:

  1. Total Annual Income: $26,400
  2. NOI: $26,400 – $6,200 = $20,200
  3. Cash Flow: $20,200 – $15,180 (Mortgage) = $5,020
  4. Cash on Cash Return: ($5,020 / $50,000) * 100 = 10.04%

This calculator helps you perform these complex estimations instantly to decide if a property is a "deal" or a "pass".

function calculateRentalROI() { // 1. Get Input Values var price = parseFloat(document.getElementById('purchasePrice').value); var down = parseFloat(document.getElementById('downPayment').value); var rate = parseFloat(document.getElementById('interestRate').value); var years = parseFloat(document.getElementById('loanTerm').value); var rent = parseFloat(document.getElementById('monthlyRent').value); var tax = parseFloat(document.getElementById('annualTax').value); var insurance = parseFloat(document.getElementById('annualInsurance').value); var maintenance = parseFloat(document.getElementById('annualMaintenance').value); // Validation if (isNaN(price) || isNaN(down) || isNaN(rate) || isNaN(rent)) { alert("Please enter valid numbers for all fields."); return; } // 2. Calculate Mortgage (Principal and Interest) var loanAmount = price – down; var monthlyRate = rate / 100 / 12; var numberOfPayments = years * 12; // Standard Mortgage Formula: M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1] var monthlyMortgage = 0; if (rate > 0) { monthlyMortgage = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1); } else { monthlyMortgage = loanAmount / numberOfPayments; } // 3. Calculate Expenses and Income var annualOpExpenses = tax + insurance + maintenance; var monthlyOpExpenses = annualOpExpenses / 12; var totalMonthlyExpenses = monthlyMortgage + monthlyOpExpenses; var annualIncome = rent * 12; var noi = annualIncome – annualOpExpenses; // Net Operating Income var monthlyCashFlow = rent – totalMonthlyExpenses; var annualCashFlow = monthlyCashFlow * 12; // 4. Calculate ROI Metrics // Cap Rate = (NOI / Purchase Price) * 100 var capRate = (noi / price) * 100; // Cash on Cash = (Annual Cash Flow / Total Cash Invested) * 100 // Assuming Total Cash Invested is just Down Payment for this simple calc (could include closing costs) var cashOnCash = 0; if (down > 0) { cashOnCash = (annualCashFlow / down) * 100; } // 5. Update HTML document.getElementById('resMortgage').innerText = "$" + monthlyMortgage.toFixed(2); document.getElementById('resExpenses').innerText = "$" + totalMonthlyExpenses.toFixed(2); // Handle styling for negative cash flow var cashFlowElem = document.getElementById('resCashFlow'); cashFlowElem.innerText = "$" + monthlyCashFlow.toFixed(2); if (monthlyCashFlow < 0) { cashFlowElem.style.color = "#e74c3c"; } else { cashFlowElem.style.color = "#27ae60"; } document.getElementById('resNOI').innerText = "$" + noi.toFixed(2); document.getElementById('resCapRate').innerText = capRate.toFixed(2) + "%"; var cocElem = document.getElementById('resCoC'); cocElem.innerText = cashOnCash.toFixed(2) + "%"; if (cashOnCash < 0) { cocElem.style.color = "#e74c3c"; } else { cocElem.style.color = "#27ae60"; } // Show Results container document.getElementById('roiResults').style.display = "block"; }

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