Estimated percentage of time the property sits empty.
Gross Annual Income:–
Vacancy Loss:–
Effective Gross Income:–
Net Operating Income (NOI):–
Capitalization Rate:0.00%
function calculateCapRate() {
// Get Input Values
var price = parseFloat(document.getElementById('propertyPrice').value);
var monthlyRent = parseFloat(document.getElementById('monthlyRent').value);
var expenses = parseFloat(document.getElementById('annualExpenses').value);
var vacancy = parseFloat(document.getElementById('vacancyRate').value);
// Validation
if (isNaN(price) || price <= 0) {
alert("Please enter a valid Property Price.");
return;
}
if (isNaN(monthlyRent) || monthlyRent < 0) {
alert("Please enter a valid Monthly Rental Income.");
return;
}
if (isNaN(expenses) || expenses < 0) {
expenses = 0; // Default to 0 if empty
}
if (isNaN(vacancy) || vacancy < 0) {
vacancy = 0; // Default to 0 if empty
}
// 1. Calculate Gross Annual Income
var grossAnnualIncome = monthlyRent * 12;
// 2. Calculate Vacancy Loss
var vacancyLoss = grossAnnualIncome * (vacancy / 100);
// 3. Calculate Effective Gross Income
var effectiveGrossIncome = grossAnnualIncome – vacancyLoss;
// 4. Calculate Net Operating Income (NOI)
var noi = effectiveGrossIncome – expenses;
// 5. Calculate Cap Rate
var capRate = (noi / price) * 100;
// Format Currency Helper
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
});
// Update DOM
document.getElementById('resGrossIncome').innerHTML = formatter.format(grossAnnualIncome);
document.getElementById('resVacancyLoss').innerHTML = "-" + formatter.format(vacancyLoss);
document.getElementById('resEffectiveIncome').innerHTML = formatter.format(effectiveGrossIncome);
document.getElementById('resNOI').innerHTML = formatter.format(noi);
document.getElementById('resCapRate').innerHTML = capRate.toFixed(2) + "%";
// Show Results
document.getElementById('resultsBox').style.display = "block";
}
Understanding the Capitalization Rate (Cap Rate)
For real estate investors, the Capitalization Rate, or "Cap Rate," is one of the most fundamental metrics used to evaluate the profitability and return potential of an investment property. Unlike a simple ROI calculation, the Cap Rate focuses specifically on the property's ability to generate natural income relative to its market value, excluding the impact of mortgage financing.
How the Cap Rate Formula Works
The formula used in this calculator is industry-standard:
Cap Rate = (Net Operating Income / Current Market Value) x 100
To derive these figures, we perform the following steps:
Gross Annual Income: Your monthly rent multiplied by 12.
Vacancy Loss: A deduction to account for periods when the property is untenanted (typically 5-10%).
Net Operating Income (NOI): The effective income minus all annual operating expenses (taxes, insurance, repairs, property management fees). Note that NOI does not include mortgage payments.
What is a "Good" Cap Rate?
There is no single "correct" Cap Rate, as it varies significantly by location, property type, and the current economic environment. However, general guidelines suggest:
4% – 5%: Often found in high-demand, low-risk areas (like downtown metropolitan centers). These properties appreciate well but offer lower immediate cash flow.
6% – 8%: Considered a healthy balance between risk and return for most residential rental properties.
10%+: High yield, but often associated with higher risk neighborhoods or properties requiring significant renovation.
Why Use This Calculator?
Using a Cap Rate calculator allows you to quickly compare different properties on an apples-to-apples basis. Because it ignores financing (mortgage debt), it tells you purely how good the deal is. Once you identify a property with a strong Cap Rate, you can then move on to calculating Cash-on-Cash return to factor in your specific loan terms.