Determine how much credit you can access from your home's value
Most lenders allow 80% to 85%.
Your Results
Total Maximum Combined Loan Value:$0
Existing Mortgage:-$0
Estimated HELOC Amount:$0
Warning: Your mortgage balance exceeds the lending limit for this LTV ratio.
How the HELOC Calculator Works
A Home Equity Line of Credit (HELOC) is a revolving line of credit that uses your home as collateral. Unlike a standard home equity loan, a HELOC allows you to borrow against your equity as needed, pay it back, and borrow again during a set period (the draw period).
The HELOC Calculation Formula
Lenders calculate your available credit using your home's current market value and your "Loan-to-Value" (LTV) ratio. The common formula is:
Step 2: Subtract your existing mortgage. If you owe $250,000, the result is $400,000 – $250,000.
Step 3: Your available HELOC limit would be $150,000.
Why Your LTV Ratio Matters
The LTV ratio represents the risk a lender is willing to take. While 80% is the industry standard, some lenders may offer up to 90% for borrowers with excellent credit scores, while others may restrict it to 70% for investment properties or in volatile markets. Keep in mind that having a higher LTV often results in a higher interest rate.
Key Factors to Consider
Interest Rates: HELOCs usually have variable interest rates tied to the prime rate.
Draw Period: Typically 10 years where you can withdraw funds and make interest-only payments.
Repayment Period: Typically 15-20 years where you can no longer withdraw funds and must pay back both principal and interest.
Appraisal Requirements: Most lenders will require a formal appraisal to verify your home's current market value before final approval.
function calculateHELOC() {
var homeValue = parseFloat(document.getElementById('homeValue').value);
var mortgageBalance = parseFloat(document.getElementById('mortgageBalance').value);
var ltvLimit = parseFloat(document.getElementById('ltvLimit').value);
// Validate inputs
if (isNaN(homeValue) || isNaN(mortgageBalance) || isNaN(ltvLimit) || homeValue <= 0) {
alert("Please enter valid positive numbers for all fields.");
return;
}
// Calculation Logic
var maxLoanValue = homeValue * (ltvLimit / 100);
var helocAmount = maxLoanValue – mortgageBalance;
// Handle UI updates
document.getElementById('helocResultContainer').style.display = 'block';
// Format as currency
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
minimumFractionDigits: 0,
maximumFractionDigits: 0
});
document.getElementById('maxLoanValueText').innerHTML = formatter.format(maxLoanValue);
document.getElementById('existingMortgageText').innerHTML = "-" + formatter.format(mortgageBalance);
var errorNote = document.getElementById('errorNote');
if (helocAmount < 0) {
document.getElementById('estimatedHELOCText').innerHTML = formatter.format(0);
document.getElementById('estimatedHELOCText').style.color = '#c0392b';
errorNote.style.display = 'block';
} else {
document.getElementById('estimatedHELOCText').innerHTML = formatter.format(helocAmount);
document.getElementById('estimatedHELOCText').style.color = '#27ae60';
errorNote.style.display = 'none';
}
// Scroll to result smoothly
document.getElementById('helocResultContainer').scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}