Home Equity Loan Calculator: Estimate Monthly Payments

A home equity loan calculator estimates your fixed monthly principal-and-interest payment and total interest from the amount borrowed, APR, and repayment term. Enter the loan amount, annual percentage rate, and term to see the estimated payment and interest; the result does not include lender fees or other housing costs.

Formula

The calculator uses the standard level-payment formula for a fully amortizing loan. It calculates an unrounded monthly payment from the principal, monthly interest rate, and number of monthly payments, then displays the payment to the nearest cent:

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

• P is the amount borrowed, in dollars.
• r is the monthly interest rate as a decimal: APR ÷ 1,200. For an 8% APR, r = 0.08 ÷ 12.
• n is the number of monthly payments: term in years × 12.

Total interest is estimated as the displayed monthly payment multiplied by the number of payments, minus the original principal: total interest = monthly payment × n − P. Because this calculator rounds the monthly payment to cents before calculating total interest, the estimate follows the payment amount shown.

Worked Example

Using the calculator’s defaults, the loan amount is $20,000, APR is 8%, and the term is 5 years. These inputs give a monthly rate of 0.08 ÷ 12 = 0.0066667 and 5 × 12 = 60 monthly payments.

1. Monthly payment = 20,000 × 0.0066667 ÷ [1 − (1 + 0.0066667)⁻⁶⁰].
2. The unrounded result is about $405.5279, which rounds to $405.53 per month.
3. Total of displayed payments = $405.53 × 60 = $24,331.80.
4. Estimated total interest = $24,331.80 − $20,000 = $4,331.80.

Assumptions

• The interest rate stays fixed for the entire term.
• Payments are made monthly, with the first payment one month after borrowing.
• Interest compounds monthly using APR divided by 12.
• The estimate excludes fees, taxes, insurance, and escrow; none of those costs is an input here.

How Home Equity Loan Payments Work

A home equity loan is generally structured as a lump sum repaid through scheduled installments. In a fixed-rate, fully amortizing arrangement, the principal-and-interest payment is level each month, but the parts making up that payment change over time. Early payments devote a larger share to interest; later payments devote more to reducing principal.

That distinction explains why multiplying the initial loan amount by the APR does not produce the monthly payment. Interest is charged on the outstanding balance, which declines as principal is repaid. The amortization formula accounts for that changing balance and spreads repayment over the selected number of months.

Using and Reading the Estimate

Enter the amount you expect to borrow, not the value of your home or the amount of equity you estimate it contains. Use the APR and term shown in a lender’s loan offer or disclosure when available. A percentage should be entered as a percentage: enter 8 for 8%, not 0.08. The APR is an input, not a prediction; obtain the actual figure and any applicable costs directly from the lender.

The first output is the estimated monthly principal-and-interest payment. The second is the estimated interest across the full term, assuming every scheduled payment is made as calculated. It is not the total amount paid: add the original principal to the interest estimate to get the modeled total of payments. For the example, that total is $24,331.80.

The calculator uses the stated term in years and converts it to months. A shorter term usually means fewer payments and less time for interest to accrue, but a higher monthly payment in the formula. A longer term spreads repayment across more months. The calculator does not judge whether either payment fits a household budget or whether a borrower will qualify.

Costs, Comparisons, and Limits

A payment estimate is not a complete borrowing-cost quote. Fees or other charges may affect the amount received, the amount owed, or the APR, depending on the loan terms. Property-related taxes, insurance, and escrow costs are outside this calculation. Check the lender’s written disclosures for the actual payment schedule, fees, and total cost rather than treating the calculator output as an offer.

A home equity loan is commonly contrasted with a home equity line of credit (HELOC). A loan generally provides a lump sum with scheduled repayment; a line of credit allows borrowing in stages under its own terms. A single fixed-payment formula cannot accurately model a line of credit with changing balances, variable rates, or an initial draw period. Use a calculator designed for that product if those features apply.

Other limits matter too. This estimate assumes a constant APR and equal monthly payments, so it does not model a variable rate, skipped or late payments, extra principal payments, or a payoff before the end of the term. It also does not calculate available equity, lender approval, or the consequences of borrowing against a home. Those questions depend on facts and terms not entered here.

Common Calculation Mistakes

• Entering 0.08 instead of 8: the APR field expects a percentage, so 8 represents 8%.
• Using the wrong amount: enter the loan principal, not the home’s market value or estimated equity.
• Mixing years and months: enter the term in years; the formula multiplies it by 12.
• Comparing payments without checking terms: different APRs, loan amounts, and repayment lengths change the result. Compare the underlying terms as well as the payment.
• Assuming the payment includes everything: the displayed amount covers modeled principal and interest only.

Rounding also creates small differences. The formula uses full precision to calculate the payment and displays cents; the total-interest output uses that displayed, rounded payment. A lender’s schedule may differ slightly due to its exact payment dates, rounding practices, fees, or contract terms.

Frequently Asked Questions

How do I calculate a home equity loan payment?
Use the loan amount, monthly interest rate (APR divided by 12), and number of monthly payments in the level-payment formula. The calculator performs those steps and rounds the payment to cents.

Does a home equity loan payment include taxes and insurance?
Not in this calculator. It estimates principal and interest only. Check the loan documents and other applicable housing bills for costs not included in the payment estimate.

Why does more of an early payment go to interest?
Interest is calculated on the outstanding balance. At the beginning, the balance is close to the original amount; as principal falls, the interest portion generally declines and more of the level payment reduces principal.

Can I use this calculator for a HELOC?
Not reliably when the balance or rate can change, or when borrowing happens in stages. This calculation assumes one lump-sum principal amount, a fixed APR, and equal monthly payments throughout the term.

Why might my lender’s payment differ?
The lender may use different rounding or payment-date conventions, and the quoted loan may include terms or charges this estimate does not model. Use the lender’s disclosure for the contractual figures.

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

Related

• Mortgage Loan Amount Calculator: The Loan a Monthly Payment Repays
• Home Equity Loan Calculator: Amount Up to a CLTV Limit and Payment
• Mortgage Calculator With Escrow: Payment With Tax and Insurance

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