HELOC Calculator

How to Use the HELOC Results

A HELOC is a revolving line of credit secured by your home equity. Unlike a fixed home-equity loan, you are approved for a credit limit and can draw only what you need. The house is collateral, so lenders usually limit the combined loan-to-value ratio across the first mortgage and the HELOC. This calculator estimates that capacity, then separates the draw-period payment from the later repayment-period payment.

The important variables are home value, outstanding mortgage balance, desired line, draw amount, rate, draw period, and repayment period. Home value and mortgage balance determine available equity. Desired credit line is the limit you want, while draw amount is the balance you actually use. Rate drives both the interest-only payment and the repayment payment. Draw period is the phase when many HELOCs require only interest. Repayment period is when the balance amortizes.

Interpret the results in stages. Available equity tells you whether the requested limit is realistic under an 85% CLTV assumption. The interest-only payment shows the lighter draw-period burden, but it is not the permanent cost of borrowing. The repayment P&I amount is often the more important number because the payment can jump when principal repayment begins. Total interest combines interest paid during the draw period with amortized repayment interest.

The rate-sensitivity table matters because most HELOCs have variable rates tied to prime or another benchmark. A payment that works at 8.5% may feel very different if the rate resets to 10.5%. Before using a HELOC for renovations, consolidation, or emergency liquidity, compare the payment shock with your cash reserve and timeline. If the HELOC is part of a purchase or renovation plan, pair this tool with the first-time home buyer guide and the mortgage calculator.

Use the draw amount honestly. A large unused line can provide flexibility, but interest is charged on the outstanding balance, not the approved limit. If you expect staggered renovation draws, run several scenarios with partial use and a higher-rate stress case. The safest HELOC plan has a clear payoff source before the repayment period starts, not just hope that rates or income cooperate later.

Also decide whether the HELOC is a bridge, a backup source of liquidity, or a long-term borrowing plan. A bridge can be reasonable when a bonus, asset sale, or refinance is likely to repay the balance. Long-term use needs more caution because variable-rate debt secured by the home can become expensive quickly. If the purpose is debt consolidation, compare the HELOC payment with the unsecured payoff plan before moving credit-card debt onto the house.