Borrowing Against Home Equity: Costs and Options

Borrowing against home equity means using the portion of your home’s value that you own as security for a loan or line of credit. This page’s calculator estimates the monthly payment and total interest for a fixed-rate, fully amortizing loan; enter the amount borrowed, annual APR, and term to see both results.

Formula

The calculator uses the standard level-payment formula for a fixed-rate loan that is repaid through equal monthly payments:

Monthly payment = P × r ÷ [1 − (1 + r)⁻ⁿ]

• P is the amount borrowed, in dollars.
• r is the monthly interest rate, calculated as APR ÷ 1,200. APR is entered as a percentage per year.
• n is the number of monthly payments, calculated as years × 12.
• Total interest is the rounded monthly payment × n − P.

The payment result is rounded to cents. Total interest uses that rounded payment, so it reflects the displayed scheduled payment across the full term. A lender’s final payment or payoff amount may differ because of its exact dates, rounding, fees, or loan terms.

Worked Example

Using the calculator defaults: a $20,000 loan, 8% APR, and a five-year term.

1. Convert the APR to a monthly rate: 8 ÷ 1,200 = 0.0066667.
2. Convert the term to payments: 5 × 12 = 60 monthly payments.
3. Substitute into the formula: $20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] = approximately $405.53 per month.
4. Calculate interest using the rounded payment: $405.53 × 60 − $20,000 = $4,331.80.

The calculator therefore shows a monthly payment of $405.53 and total interest of $4,331.80.

Assumptions

• The APR and payment remain fixed for the full term.
• Payments are equal, made monthly, with the first payment one month after borrowing.
• Interest compounds monthly at APR ÷ 12.
• The estimate excludes fees, taxes, insurance, PMI, and escrow, and assumes no missed or extra payments.

How Home Equity Borrowing Works

Home equity is the difference between a home’s current market value and the balances secured by it. For example, if a home is valued at $400,000 and the mortgage balance is $250,000, the arithmetic difference is $150,000. That figure is not necessarily the amount a homeowner can borrow: a lender sets its own underwriting and valuation requirements, and may account for other secured debts and the borrower’s finances. Get any actual borrowing limit, rate, fees, and terms directly from the lender.

Unlike an unsecured loan, a home-equity loan is secured by the property. If payments are not made as agreed, the home may be at risk of foreclosure under applicable law and contract terms. Borrowing can therefore turn an expense or debt that was not secured by the home into debt that is.

Common Ways to Borrow

• Home-equity loan: Typically provides a lump sum repaid on a schedule. A fixed-rate structure can make scheduled principal-and-interest payments predictable; verify whether the specific offer has a fixed or variable rate and what fees apply.
• Home-equity line of credit (HELOC): Provides access to credit up to an approved limit, often allowing borrowing in stages. Rates, payment requirements, access periods, and repayment arrangements depend on the contract; a variable rate can make payments change.
• Cash-out refinance: Replaces an existing mortgage with a new, larger mortgage and pays out some difference, subject to the transaction’s terms and costs. It changes the mortgage itself, rather than creating a separate home-equity loan or line.

These products are not interchangeable. Compare the full contract, including whether the rate can change, how payments are calculated, when repayment begins, and what happens at the end of any draw period. The calculator above models only a fixed-rate installment loan, not a HELOC’s changing balance or a cash-out refinance’s new mortgage.

Costs and Risks to Examine

Interest is only one part of the cost. Ask for an itemized disclosure showing any application, valuation, closing, annual, transaction, or early-termination charges that apply. Find out whether a quoted APR includes the fees relevant to the offer, and compare the amount received with the total amount repaid. A longer term can lower the scheduled monthly payment while increasing total interest if the rate and balance are otherwise unchanged.

Consider uncertainty as well as the scheduled payment. A variable rate may rise; a HELOC payment can change when the balance or repayment phase changes; and a household’s income or expenses may shift during a long loan term. The home is collateral, so missed payments can have more serious consequences than missed payments on an unsecured debt. Do not treat home equity as cash without accounting for repayment and the possibility that the home’s value may change.

When to Use This Calculator and Its Limits

Use the estimate to understand the payment mechanics of a fixed-rate loan, test different amounts or terms, or check how much scheduled interest follows from the entered assumptions. For instance, entering a lender’s quoted loan amount, APR, and term can produce a rough comparison figure, but it does not establish eligibility or reproduce a lender’s official offer.

Enter APR as a percentage, such as 8 for eight percent—not 0.08. Enter the term in years, not months. The formula assumes a positive rate and a level payment schedule; it does not include fees financed into the balance unless you add them to the loan amount. Rounding each payment to cents also means the final amount may not match a lender’s exact amortization schedule.

Frequently Asked Questions

How much can I borrow against my home equity?
The difference between home value and secured balances gives a rough equity figure, not a borrowing limit. The lender determines any available amount using its valuation, underwriting, and contract terms; ask the lender for a specific figure.

Is a home-equity loan the same as a HELOC?
No. A home-equity loan generally pays a lump sum with scheduled repayment, while a HELOC provides a credit line that can be drawn over time. Rates, access, fees, and repayment terms vary by contract.

Can I lose my home if I cannot repay?
Because the home secures the debt, failure to meet the contract’s payment obligations can put it at risk of foreclosure, subject to applicable law and the agreement. Review the lender’s default and collection terms before borrowing.

Does this calculator work for a HELOC?
Not directly. It assumes one fixed loan amount, a fixed APR, and equal monthly payments over a set term. A HELOC may have a changing balance, variable rate, and different payment phases.

Does the monthly payment include fees or taxes?
No. The estimate includes principal and interest only. Check the lender’s disclosure for fees and any other costs or payments tied to the product.

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

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in p | 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