HELOC Calculator

Estimate how much home equity may be available for a HELOC, plus the draw-period payment and the repayment-period payment.

Property and existing mortgage

Start with the current value of the property and the balance of your first mortgage or any existing liens.

Line request

Lenders usually cap the total mortgage balance plus HELOC at a combined loan-to-value limit.

Combined LTV measures the first mortgage plus the HELOC against the current home value.

HELOC terms

This estimate assumes an interest-only draw period followed by an amortized repayment period at the same rate.

During repayment, the balance is treated like a standard amortizing loan using the same rate entered above.

How to Use the HELOC Calculator

Estimate how much home equity may be available for a HELOC, plus the draw-period payment and the repayment-period payment. This calculator is part of our mortgage & loans collection, where readers compare payment scenarios, borrowing costs, affordability, refinance math, and payoff timing before making a decision. Model monthly payments, APR, amortization, refinance savings, points, PMI, and rent-versus-buy so you can compare scenarios before applying.

Start with realistic values for Current Home Value, Current Mortgage Balance, Requested HELOC Line, and Max Combined LTV (%). Those inputs usually carry the biggest weight in the estimate, so it helps to change one assumption at a time and review how the output moves.

When you review the output, look beyond the single headline number. Compare conservative and aggressive assumptions, because the range between those scenarios often reveals more about monthly payment, total interest, affordability, and payoff speed than one estimate on its own.

After you review the result, compare it with Loan Calculator, Annual Percentage Rate (APR) Calculator, and Payment / Amortization Calculator. Looking at related calculators side by side can show whether the main trade-off is monthly payment, total interest, affordability, and payoff speed, and it gives you a better starting point for a lender conversation or financial planning decision.

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Frequently Asked Questions

Use the HELOC Calculator to test realistic scenarios before you borrow, save, invest, or change a payment strategy. Start with Current Home Value, Current Mortgage Balance, Requested HELOC Line, and Max Combined LTV (%), review the result, and then adjust one input at a time so you can compare the impact clearly.

Inputs such as Current Home Value, Current Mortgage Balance, Requested HELOC Line, and Max Combined LTV (%) usually drive the result the most. In the mortgage & loans category, small changes in rates, term length, upfront fees, escrow costs, and payment strategy can materially change the estimate, so it is worth testing conservative assumptions as well as optimistic ones.

Compare the result with Loan Calculator, Annual Percentage Rate (APR) Calculator, and Payment / Amortization Calculator. That gives you better context for deciding whether your main priority is monthly payment, total interest, affordability, and payoff speed, rather than relying on a single estimate in isolation.