To calculate LTV for a HELOC, you actually run two numbers. Plain loan-to-value is your current mortgage balance divided by your home’s appraised value, times 100. Combined loan-to-value (CLTV) is the one HELOC lenders care about: add your mortgage balance to the HELOC you want, divide by the home’s value, and multiply by 100. Most lenders cap CLTV between 80 and 85 percent, so where you land decides whether you qualify and what rate you pay.
The Three Numbers You Need First
Every version of the calculation uses the same inputs. Get these right and the math takes a minute.
- Your current mortgage balance. Pull the unpaid principal from your most recent statement or your servicer’s portal, not the original loan amount.
- Your home’s value. This comes from an appraisal or an alternative valuation the lender accepts. More on how that number gets set below.
- The HELOC amount you want. Even if you don’t plan to draw it all at once, the full credit line matters for one of the ratios.
Only debts secured by the home go into these ratios. Car loans, student loans, and credit cards affect your debt-to-income ratio but have no place here. The numerator is your first mortgage plus any existing home equity loan plus the HELOC in play.1Fannie Mae. Combined Loan-to-Value (CLTV) Ratios
Calculating Plain LTV
LTV describes your first mortgage alone. Divide your mortgage balance by the appraised value, then multiply by 100.
If your home appraises at $400,000 and you owe $200,000, your LTV is 50 percent. That means you have roughly 50 percent equity, which is the pool a HELOC lender can let you borrow against. LTV on its own tells the lender nothing about the new HELOC, though. That is what CLTV is for.
Calculating CLTV, the Ratio That Decides Approval
CLTV captures the total debt that will be secured by your home once the HELOC is open. Add your mortgage balance, the outstanding balance of any existing home equity loan, and the HELOC you are requesting. Divide by the property value. Multiply by 100.1Fannie Mae. Combined Loan-to-Value (CLTV) Ratios
Use the $400,000 home with a $200,000 mortgage. Ask for a $50,000 HELOC and your secured debt totals $250,000. Divide by $400,000 and you get a CLTV of 62.5 percent, comfortably inside most lenders’ limits.
Change the numbers. If you owe $300,000 and want a $60,000 HELOC, total secured debt is $360,000. Divided by $400,000, that is a 90 percent CLTV. Most lenders would decline this outright because it leaves only a 10 percent equity cushion.
HCLTV, the Ratio That Uses Your Full Credit Line
There is a third ratio that catches borrowers off guard. The high combined loan-to-value ratio (HCLTV) uses the full credit limit of any HELOC, not just the drawn balance. If you have a $100,000 HELOC and have borrowed $20,000, CLTV counts the $20,000; HCLTV counts the full $100,000.2Fannie Mae. Home Equity Combined Loan-to-Value (HCLTV) Ratios
The formula adds your first mortgage’s original loan amount, the maximum credit line of every HELOC regardless of what has been drawn, and the unpaid balance of any closed-end subordinate loans. Divide the total by the lesser of the sale price or appraised value.2Fannie Mae. Home Equity Combined Loan-to-Value (HCLTV) Ratios
This matters because lenders selling into the secondary market must calculate HCLTV for eligibility. A CLTV of 65 percent based on current usage can still fail if the full available credit line pushes HCLTV above the cap. HCLTV can never be lower than CLTV, since it always counts at least as much debt.
How Your Home Gets Valued
The denominator is usually where borrowers lose control of the calculation. Lenders need a defensible value before they will run the ratios, and the method they pick directly moves the result.
A traditional full appraisal, with a licensed appraiser inspecting inside and out, is the most thorough option and typically costs $300 or more. A growing share of HELOC applications skip the visit. Industry data from 2024 shows more than 75 percent of home equity originations used an automated valuation model (AVM) or desktop valuation instead of a full appraisal.
An AVM is a computer algorithm that estimates value from public records and comparable sales. It is cheap for the lender and returns a result in minutes. Lenders tend to accept AVMs for borrowers with strong credit who are asking for a smaller line relative to their equity. A desktop valuation sits between an AVM and a full appraisal: a licensed appraiser reviews data and photos without visiting. A drive-by appraisal, where the appraiser views the exterior from the street, is another middle option. If you think the valuation came in low, ask whether a full appraisal is available.
Where Lenders Draw the Line
Most lenders set the maximum CLTV between 80 and 85 percent for a standard HELOC. Borrowers with excellent credit sometimes reach 85 percent. Jumbo HELOCs often sit lower, around 65 to 75 percent, because the dollar amounts carry more risk. Fannie Mae allows subordinate financing on a primary residence up to a 90 percent CLTV and HCLTV, though individual lenders frequently impose tighter caps.3Fannie Mae. Eligibility Matrix
Staying under the cap is not the whole story. Your ratio also prices your loan. Fannie Mae’s loan-level price adjustment matrix shows the pattern. A borrower with a 740 to 759 credit score at an LTV between 75 and 80 percent faces a 0.875 percent price adjustment. Push LTV above 80 percent and the adjustment climbs to 1.000 percent. For cash-out refinances, the penalty is steeper: that same borrower at 75 to 80 percent LTV sees a 2.375 percent adjustment.4Fannie Mae. Loan-Level Price Adjustment Matrix These adjustments translate into a higher rate or upfront fees.
Higher credit scores soften the hit. A borrower scoring 780 or above pays no adjustment until LTV exceeds 75 percent on a purchase, and even then the adjustment is a modest 0.375 percent. The ratio and the score work together, and the best pricing goes to borrowers who look good on both.4Fannie Mae. Loan-Level Price Adjustment Matrix
How to Lower Your Ratio Before You Apply
If your CLTV is too high for approval or lands you in an expensive pricing tier, you have three levers.
Pay down the mortgage balance. This directly shrinks the numerator. An extra $10,000 toward principal on a $400,000 home drops your LTV by 2.5 percentage points.
Grow the denominator through a higher valuation. If you have made significant improvements or home prices in your area have risen since your last appraisal, a fresh valuation may push you below a threshold that matters.
Ask for less. You do not have to request the maximum line your lender offers. Dropping a request from $80,000 to $50,000 can move an 85 percent CLTV down to 77 percent, which often means a better pricing tier and a cleaner approval.
Timing is a lever too. If normal mortgage payments will carry your first-lien LTV below 80 percent within a year or two, waiting can earn you better HELOC terms and avoid the complications a subordinate lien creates on the first mortgage side.