Equity Line of Credit Refinance Calculator

This equity line of credit refinance calculator estimates the monthly payment and total interest for a fixed-rate loan used to refinance a home equity line of credit (HELOC). Enter the new loan amount, APR, and term to see the estimated payment and interest; it does not determine whether refinancing is available or suitable for you.

Formula

The calculator models a fully amortizing loan with a fixed annual percentage rate (APR) and equal monthly payments. It uses the standard level-payment formula:

• Monthly payment: M = P × r ÷ [1 − (1 + r)⁻ⁿ]
• Total interest: I = M × n − P

Here, P is the new loan amount in dollars, APR is the annual rate entered as a percentage, r = APR ÷ 1,200 is the monthly rate as a decimal, n is the term in years × 12 months, M is the monthly payment in dollars, and I is estimated total interest in dollars. The displayed payment is rounded to cents. Total interest uses that rounded payment, so it reflects the calculator’s scheduled-payment estimate.

Worked Example

Using the default inputs—P = $20,000, APR = 8%, and a five-year term:

1. Monthly rate: r = 8 ÷ 1,200 = 0.0066667.
2. Number of payments: n = 5 × 12 = 60.
3. Payment: M = 20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] ≈ $405.53 per month.
4. Total interest: I = $405.53 × 60 − $20,000 = $4,331.80.

The figures are estimates based on the formula and displayed precision. Actual loan schedules may differ due to lender rounding, payment dates, fees, or terms not represented here.

Assumptions

• The interest rate is fixed for the full term.
• Payments are equal monthly payments, made at the end of each monthly period.
• Interest compounds monthly at APR ÷ 12.
• The calculation excludes lender fees, taxes, insurance, PMI, escrow, and any existing HELOC payoff charges.

What Refinancing a HELOC Means

A HELOC is generally a revolving credit line secured by a home: a borrower can draw funds up to an available limit, and the balance and payment may change as borrowing and repayment occur. Refinancing means replacing that existing debt with a new loan or credit arrangement. This calculator focuses on one common arithmetic case: converting the amount being refinanced into a fixed-rate loan with a set term and level monthly payments.

The amount entered should represent the new loan principal, not necessarily the original HELOC limit. For example, if the current balance is $30,000, the credit line limit might be higher, but the amount needed to pay off the balance may differ because of accrued interest, charges, or other amounts included in the refinance. Use a payoff quote or other verified figure from the lender for an accurate principal estimate. If costs are financed into the new loan, the amount borrowed would include them; this calculator has no separate fee input.

How to Use and Read the Estimate

• New loan amount: Enter the principal being modeled in dollars.
• Interest rate: Enter the proposed APR as a percentage, such as 8 for 8%, not 0.08.
• Term: Enter the duration in years. The formula converts it to monthly payments.
• Monthly payment: Treat this as the modeled principal-and-interest payment under the assumptions above.
• Total interest: This estimates the interest paid across all modeled payments, not the total amount of every possible refinancing cost.

Changing the term changes both the payment schedule and the period over which interest is calculated. A longer term spreads principal repayment over more months, while a shorter term means fewer payments. The calculator shows the arithmetic consequences for the inputs; it does not compare the full costs or terms of two actual offers.

Costs, Comparisons, and Limits

To evaluate a real refinance offer, identify the payoff amount, the proposed APR, the term, and any charges that affect the amount borrowed or the total paid. Request the lender’s written disclosures for the actual payment schedule and costs. This tool does not calculate an adjustable-rate HELOC payment, a draw-period payment, a changing balance, an interest-only period, or the payment on a refinance that has a variable rate.

A useful comparison requires consistent assumptions. For example, compare the same payoff balance and account for the remaining payments on the existing debt as well as the proposed loan’s term and costs. Comparing only monthly payments can be misleading: a lower payment could result from extending repayment over more months, and the total interest estimate could then be higher. Conversely, a payment estimate alone does not show whether a quoted rate can change or whether fees are paid separately.

Do not interpret the result as an approval estimate or a prediction of the rate a lender will offer. Rates, fees, and available terms are inputs that must come from the actual offer. The formula also assumes the balance is fully repaid with the stated equal payments and does not model missed or extra payments.

Common Mistakes and Alternatives

• Entering a percentage incorrectly: use 8 for 8%, not 0.08.
• Using the credit-line limit instead of the amount actually needed to refinance.
• Forgetting that a financed charge increases the principal and can affect payment and interest.
• Comparing payment amounts without comparing term length and total repayment.
• Assuming a current HELOC’s variable rate or changing balance can be represented by this fixed-rate formula.

Other possible arrangements may include keeping the existing line, replacing it with another line, or using a different fixed-payment loan. Their costs and repayment mechanics vary. The calculator can model only a fixed-rate, fully amortizing loan with the three inputs shown; use a separate calculation for a different structure.

Frequently Asked Questions

Can I refinance a HELOC into a fixed-rate loan?
Some lending arrangements may allow a HELOC balance to be replaced with a fixed-rate loan, but availability and terms depend on the specific offer. This calculator illustrates the payment math and does not establish eligibility.

Does this calculate my current HELOC payment?
No. It estimates payments on a new fixed-rate, fully amortizing loan. A HELOC may have a variable rate, changing balance, or different payment rules that this formula does not model.

Should I enter my HELOC limit or current balance?
Use the amount of new principal you want to model. A payoff figure may differ from the current balance because of accrued interest or other amounts; obtain a current payoff amount from the lender.

Does total interest include refinance fees?
No. The calculator includes interest implied by the entered principal, APR, and term. It does not separately include fees, taxes, insurance, or other costs.

Why might my lender’s payment differ?
The actual payment can reflect a different principal, APR, term, payment date, rounding method, fee treatment, or loan structure. The lender’s disclosure provides the terms for the actual transaction.

This result is an estimate, and the lender’s disclosure gives the exact figures.

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in p | New loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
out pmt | Monthly payment | $ | p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2