Home Equity Loan Calculator: Estimate Monthly Cost

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

Formula

The calculator uses the standard level-payment loan formula, with monthly payments and a fixed rate:

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 the term in years × 12.
• Total interest is the displayed monthly payment × n − P. It uses the payment rounded to cents, so it is an estimate of interest across the scheduled payments.

The formula spreads repayment across equal monthly payments. Each payment includes interest on the outstanding balance and a principal contribution. Early in the schedule, interest generally makes up a larger share; as principal is repaid, that share falls. The calculator assumes the APR is the rate used for this arithmetic. A lender may disclose a different contractual rate or use different payment details, so compare the assumptions with the loan documents.

Worked Example

Using the calculator’s defaults—$20,000 borrowed, 8% APR, and a five-year term:

1. Convert APR to a monthly rate: 8 ÷ 1,200 = 0.0066667, or about 0.6667% per month.
2. Convert the term to payments: 5 × 12 = 60 months.
3. Substitute into the formula: $20,000 × 0.0066667 ÷ [1 − (1 + 0.0066667)⁻⁶⁰].
4. The monthly payment is approximately $405.53, rounded to cents.
5. Estimated total interest is $405.53 × 60 − $20,000 = $4,331.80.

Actual final-payment amounts can differ because lenders may calculate interest using their exact dates, rounding method, and contractual terms.

Assumptions

• The interest rate stays fixed for the full term.
• Payments are monthly, made on schedule; the formula does not model irregular payment dates.
• Interest is compounded monthly using APR ÷ 12.
• Fees, taxes, insurance, property costs, and any lender-specific charges are not included.

How a Home Equity Loan Estimate Works

A home equity loan is generally structured as a lump-sum loan secured by a home, with repayment over an agreed term. That differs from a home equity line of credit, which is revolving credit that may allow borrowing at different times and may have variable rates or changing payment rules. This calculator models only a single advance repaid through equal monthly payments at a fixed rate.

Use the loan amount you expect to borrow—not the property’s value or the equity figure by itself. The lender determines the amount and terms available; this calculator does not estimate approval, eligibility, or a borrowing limit. Enter the APR and term from a written quote or loan disclosure when available. If you are exploring possibilities, treat the entered rate and amount as scenarios rather than a prediction of an offer.

The monthly figure is useful for understanding the scheduled loan payment, but it is not a complete household budget. It does not account for other debts, income changes, property expenses, or the possibility of missed or late payments. A loan secured by a home also involves collateral risk: failure to meet contractual obligations can have serious consequences for the property. Review the lender’s disclosures and consider the full repayment obligation before making decisions.

Reading the Result and Avoiding Errors

The payment is principal and interest only under the stated assumptions. Total interest is the amount above the original principal implied by the rounded scheduled payment. It is not the total amount paid: estimated total payments would be the monthly payment multiplied by the number of months, including repayment of principal.

• Enter APR as a percentage: use 8 for 8%, not 0.08. The formula converts the percentage to a monthly decimal rate.
• Enter the term in years: a five-year term means 60 monthly payments, not five payments.
• Use the amount actually borrowed: if charges are added to the balance, check the disclosure to see whether they are part of the amount financed.
• Compare like with like: estimates are only comparable when the loan amount, APR basis, term, and payment assumptions match.
• Expect rounding differences: the calculator rounds the payment to cents; a lender’s exact daily accrual and final payment may produce a slightly different total.

APR is an annualized measure used for comparison and does not, by itself, describe every fee or cash-flow detail in a specific contract. Ask the lender for the amount financed, payment schedule, total of payments, and any charges that apply. Use the lender-provided figures for a precise contractual comparison.

Limits and Related Loan Types

This estimate is not a payoff schedule and does not model extra payments, skipped payments, variable rates, a balloon payment, or a changing balance. Paying additional principal can change the payoff timeline and interest, but the result depends on how the lender applies extra funds and whether the contract permits the intended payment method. To estimate those effects, a calculator needs additional inputs and assumptions.

A home equity line of credit is not interchangeable with a fixed lump-sum home equity loan. A line may have a draw period, changing balances, and rate or payment changes that a single fixed-payment formula cannot represent. Likewise, refinancing an existing loan involves separate costs and terms not included here. Ask for the applicable disclosures and use a calculator designed for the specific product if its payment structure differs.

Frequently Asked Questions

How do I estimate a home equity loan’s monthly payment?
Enter the amount borrowed, APR, and term in years. The calculator converts APR to a monthly rate and applies the fixed-payment formula to estimate principal and interest.

Does the monthly cost include taxes and insurance?
No. The result covers estimated loan principal and interest only. It excludes property taxes, homeowners insurance, fees, and other expenses unless separately included in a lender’s payment quote.

Is a home equity loan payment fixed?
This calculator assumes a fixed APR and equal monthly payments. Whether a particular loan has those features depends on its contract; check the lender’s documents.

Why is my lender’s payment different from the calculator?
The APR, amount financed, term, payment dates, fees, rounding, or final-payment treatment may differ. Compare the calculator inputs with the lender’s disclosed figures and schedule.

Can this calculator estimate a home equity line of credit?
No. It assumes one lump-sum balance, a fixed rate, and equal payments. A line of credit can have changing balances and other payment rules.

Does this estimate show how much I can borrow?
No. It calculates payments for an amount you enter; it does not determine property equity, approval, or a lender’s borrowing limit.

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