.calc-container {
max-width: 800px;
margin: 0 auto;
padding: 20px;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
background: #f9f9f9;
border: 1px solid #e0e0e0;
border-radius: 8px;
}
.calc-header {
text-align: center;
margin-bottom: 25px;
}
.calc-header h2 {
color: #2c3e50;
margin-bottom: 10px;
}
.calc-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
}
@media (max-width: 768px) {
.calc-grid {
grid-template-columns: 1fr;
}
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #555;
}
.input-group input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
font-size: 16px;
}
.input-group input:focus {
border-color: #3498db;
outline: none;
}
.calc-btn {
grid-column: 1 / -1;
background-color: #27ae60;
color: white;
border: none;
padding: 15px;
font-size: 18px;
border-radius: 4px;
cursor: pointer;
transition: background 0.3s;
margin-top: 10px;
}
.calc-btn:hover {
background-color: #219150;
}
.results-section {
grid-column: 1 / -1;
background: #fff;
padding: 20px;
border-radius: 6px;
border: 1px solid #ddd;
margin-top: 20px;
display: none; /* Hidden by default */
}
.result-row {
display: flex;
justify-content: space-between;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.result-row:last-child {
border-bottom: none;
}
.result-label {
color: #7f8c8d;
}
.result-value {
font-weight: bold;
color: #2c3e50;
}
.highlight-result {
background-color: #f0f9ff;
padding: 15px;
border-radius: 4px;
margin-top: 10px;
}
.highlight-result .result-value {
color: #2980b9;
font-size: 1.2em;
}
.pos-cf { color: #27ae60 !important; }
.neg-cf { color: #c0392b !important; }
/* SEO Content Styles */
.seo-content {
max-width: 800px;
margin: 40px auto;
line-height: 1.6;
color: #333;
}
.seo-content h2 {
color: #2c3e50;
border-bottom: 2px solid #3498db;
padding-bottom: 10px;
margin-top: 30px;
}
.seo-content h3 {
color: #34495e;
margin-top: 25px;
}
.seo-content ul {
margin-bottom: 20px;
}
.seo-content li {
margin-bottom: 10px;
}
function calculateRental() {
// 1. Get Inputs using standard var
var priceInput = document.getElementById("propPrice");
var downInput = document.getElementById("downPercent");
var rateInput = document.getElementById("intRate");
var termInput = document.getElementById("loanTerm");
var rentInput = document.getElementById("monthlyRent");
var taxInput = document.getElementById("taxRate");
var insuranceInput = document.getElementById("insuranceYearly");
var maintInput = document.getElementById("maintPercent");
var vacancyInput = document.getElementById("vacancyPercent");
var hoaInput = document.getElementById("hoaFee");
// 2. Parse values
var price = parseFloat(priceInput.value);
var downPercent = parseFloat(downInput.value);
var interestRate = parseFloat(rateInput.value);
var years = parseFloat(termInput.value);
var rent = parseFloat(rentInput.value);
var taxRate = parseFloat(taxInput.value);
var insurance = parseFloat(insuranceInput.value);
var maintPercent = parseFloat(maintInput.value);
var vacancyPercent = parseFloat(vacancyInput.value);
var hoa = parseFloat(hoaInput.value);
// 3. Validation
if (isNaN(price) || isNaN(downPercent) || isNaN(interestRate) || isNaN(years) || isNaN(rent)) {
alert("Please fill in all numeric fields correctly.");
return;
}
// 4. Calculations
// Loan Calculation
var downPaymentAmount = price * (downPercent / 100);
var loanAmount = price – downPaymentAmount;
var monthlyRate = (interestRate / 100) / 12;
var numberOfPayments = years * 12;
// Mortgage Payment (P&I)
var mortgagePayment = 0;
if (interestRate === 0) {
mortgagePayment = loanAmount / numberOfPayments;
} else {
mortgagePayment = loanAmount * (monthlyRate * Math.pow(1 + monthlyRate, numberOfPayments)) / (Math.pow(1 + monthlyRate, numberOfPayments) – 1);
}
// Monthly Expenses
var monthlyTax = (price * (taxRate / 100)) / 12;
var monthlyInsurance = insurance / 12;
var monthlyMaint = rent * (maintPercent / 100);
var monthlyVacancy = rent * (vacancyPercent / 100);
var monthlyHOA = isNaN(hoa) ? 0 : hoa;
var totalMonthlyExpenses = monthlyTax + monthlyInsurance + monthlyMaint + monthlyVacancy + monthlyHOA;
var totalMonthlyOutflow = mortgagePayment + totalMonthlyExpenses;
// Cash Flow
var monthlyCashFlow = rent – totalMonthlyOutflow;
var annualCashFlow = monthlyCashFlow * 12;
// Net Operating Income (NOI)
// NOI = Income – Operating Expenses (Exclude Mortgage Interest & Tax dep – usually excludes debt service entirely)
// Standard NOI = (Gross Income – Vacancy – Operating Expenses)
// Operating Expenses here: Tax, Insurance, Maint, HOA. NOT Mortgage.
var grossAnnualIncome = rent * 12;
var annualVacancy = monthlyVacancy * 12;
var effectiveGrossIncome = grossAnnualIncome – annualVacancy;
var annualOperatingExpenses = (monthlyTax + monthlyInsurance + monthlyMaint + monthlyHOA) * 12;
var noi = effectiveGrossIncome – annualOperatingExpenses;
// Cap Rate
// Cap Rate = NOI / Purchase Price
var capRate = (noi / price) * 100;
// Cash on Cash Return
// CoC = Annual Cash Flow / Total Cash Invested
// Assuming Closing costs are ~2% of price for simplicity in this estimate, or just use Down Payment if specific costs aren't asked.
// Let's assume Cash Invested = Down Payment + (Price * 0.03 Closing Costs estimation)
var closingCosts = price * 0.03;
var totalCashInvested = downPaymentAmount + closingCosts;
var cocReturn = (annualCashFlow / totalCashInvested) * 100;
// 5. Display Results
document.getElementById("resMortgage").innerText = "$" + mortgagePayment.toFixed(2);
document.getElementById("resTax").innerText = "$" + monthlyTax.toFixed(2);
document.getElementById("resOps").innerText = "$" + (totalMonthlyExpenses – monthlyTax).toFixed(2); // Ops ex taxes
document.getElementById("resTotalCost").innerText = "$" + totalMonthlyOutflow.toFixed(2);
var cfElement = document.getElementById("resCashFlow");
cfElement.innerText = "$" + monthlyCashFlow.toFixed(2);
if (monthlyCashFlow >= 0) {
cfElement.className = "result-value pos-cf";
} else {
cfElement.className = "result-value neg-cf";
}
document.getElementById("resNOI").innerText = "$" + noi.toFixed(2);
document.getElementById("resCap").innerText = capRate.toFixed(2) + "%";
document.getElementById("resCOC").innerText = cocReturn.toFixed(2) + "%";
// Show section
document.getElementById("resultsArea").style.display = "block";
}
Rental Property Cash Flow Calculator
Analyze the profitability of your real estate investment.
Investment Analysis
Monthly P&I Mortgage:$0.00
Monthly Property Tax:$0.00
Other Monthly Expenses (Ins, HOA, Maint):$0.00
Total Monthly Outflow:$0.00
Net Monthly Cash Flow:$0.00
Net Operating Income (NOI Yearly):$0.00
Cap Rate:0.00%
Cash on Cash Return:0.00%
Understanding Rental Property Cash Flow
Calculating cash flow is the single most important step in real estate investing. Positive cash flow ensures your investment puts money in your pocket every month after all expenses are paid. This Rental Property Cash Flow Calculator helps investors evaluate whether a potential deal is an asset or a liability.
Key Metrics Explained
1. Monthly Cash Flow
This is the profit remaining after all operating expenses and debt service (mortgage payments) are deducted from the rental income.
Formula: Rental Income – (Mortgage + Taxes + Insurance + HOA + Maintenance + Vacancy)
2. Net Operating Income (NOI)
NOI measures the profitability of a property before adding in any costs from financing or taxes. It is crucial for determining the raw earnings power of the real estate asset.
3. Cap Rate (Capitalization Rate)
The Cap Rate is a way to compare the return on investment of different properties, assuming you paid all cash. It helps compare properties in different markets regardless of financing terms.
Formula: (NOI / Purchase Price) × 100
4. Cash on Cash Return (CoC)
This is perhaps the most practical metric for investors using leverage (mortgages). It calculates the annual return on the actual cash you invested (Down Payment + Closing Costs).
Formula: (Annual Cash Flow / Total Cash Invested) × 100
What is a "Good" Return?
Cash Flow: Many investors target $100-$300 per door per month as a minimum.
Cash on Cash: A return of 8-12% is often considered good in stable markets, while aggressive investors may look for 15%+.
Cap Rate: Generally, 4-6% indicates a lower risk/high appreciation area, while 8-10% indicates higher cash flow but potentially higher risk.
Estimating Expenses Correctly
Novice investors often underestimate expenses. Always account for:
Vacancy: Properties won't be rented 365 days a year. Use 5-8% as a buffer.
Maintenance: Roofs leak and toilets break. Set aside 5-10% of rent for repairs.
Property Management: Even if you self-manage, account for your time (usually 8-10% of rent).