HELOC Calculator is a free, independent tool that estimates your available home equity line of credit and what payments look like across both the draw period and the repayment period.
The tool applies the standard loan-to-value (LTV) formula lenders use: it multiplies your home's current value by your selected max LTV ratio (typically 80–85%) and subtracts your existing mortgage balance to estimate your maximum credit line. Draw-period payments are calculated as interest-only on your drawn balance, using the standard monthly interest formula. Repayment-period payments use a standard amortization formula (the same math behind any installment loan) to spread principal and interest over your chosen repayment term.
This tool does not constitute financial or lending advice, and it is not a loan offer or pre-qualification. HELOC rates are variable and change with the market; your actual credit limit, rate, and terms depend on your specific lender, credit score, debt-to-income ratio, and property. Always get quotes from multiple lenders and read the full terms, including rate caps and fees, before opening a line of credit.
This site is not affiliated with, endorsed by, or sponsored by any bank, credit union, or mortgage lender. It is supported by display advertising (Google AdSense) so the calculator can remain free with no signup. All calculations run locally in your browser — nothing you enter is transmitted, stored, or sold.