By Jessica Martinez · Contributing Writer, Business & FinanceEnter your home value and outstanding debt. The calculator returns your equity, your loan-to-value ratio, and the rough amount available to borrow at an 80% LTV ceiling.
By Jessica Martinez · Contributing Writer, Business & FinanceA desktop math check, not an appraisal. Lenders will order their own valuation before offering real numbers.
Take what your home would sell for, subtract every loan secured against it, and what is left is your equity. On a $450,000 home carrying a $180,000 mortgage and nothing else, that is $270,000. The calculator also converts that into a loan-to-value ratio and estimates the room left under a typical 80% combined-LTV ceiling.
LTV is just your total secured debt divided by home value, expressed as a percent. A 40% LTV means you owe 40 cents of every dollar the home is worth; a 90% LTV means you owe 90 cents on the dollar and have very little cushion. Lenders use LTV as their main risk gauge for a HELOC or cash-out refinance, and most cap combined LTV, meaning your current mortgage plus the new loan, somewhere between 80% and 90% depending on the product and your credit.
This calculator is deliberately narrow. It does not know your credit score, your income, or which lender you would use, so treat the tappable figure as a ceiling estimate rather than an offer. If you are weighing this against a reverse mortgage instead of a HELOC, the two products use completely different math, since a HECM's payout formula is driven by age and an interest-rate factor rather than a flat 80% line. The HECM payout tool elsewhere on this site runs that separate formula on the same kind of inputs.
Lenders leave a cushion below full value so a drop in price or a missed payment does not immediately put the loan underwater. Some lenders go to 85%; this calculator uses 80% as a conservative planning line, not a guarantee any specific lender offers that exact number.
No. A HECM reverse mortgage uses an entirely different formula based on age and a HUD-published factor, which is usually well under 80% of value. This page's ceiling applies to conventional equity products like a HELOC or cash-out refinance, not to a reverse mortgage.
The tappable amount shown will read zero, because the math floors at zero rather than showing a negative number. That is the calculator telling you there is no room left under an 80% ceiling given what you already owe.
An online estimate is fine for a rough pass, but every real product decision, a HELOC, a refinance or a reverse mortgage, will rely on a formal appraisal ordered by the lender. Treat the online number as a starting guess, not a ceiling.
Curious what a reverse mortgage would pay out on the same house instead of a HELOC? Run the numbers in the HECM proceeds estimator. Weighing the two products head to head based on your age and payment preference? The age-and-payments comparison tool gives a direct recommendation.