Home Equity Loan Payments: Calculate Your Monthly Cost

Calculate an estimated fixed monthly payment on a home equity loan by entering the amount borrowed, annual interest rate (APR), and repayment term. The calculator also estimates total interest over the term; it does not include lender fees or other costs.

Formula

The calculator treats the loan as a fixed-rate loan with equal monthly payments. It uses the standard amortizing-loan payment formula:

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

• P is the loan principal, in dollars.
• r is the monthly interest rate, calculated as APR ÷ 1,200. The APR is entered as a percentage per year.
• n is the number of monthly payments, calculated as the term in years × 12.

The payment is rounded to the nearest cent. Estimated total interest is the rounded monthly payment multiplied by the number of payments, minus the original principal: interest = payment × n − P. Because the displayed payment is rounded, this total is an estimate and may differ slightly from a lender’s final amortization schedule.

Worked Example

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

1. Convert APR to a monthly rate: 8 ÷ 1,200 = 0.0066667.
2. Find the number of payments: 5 × 12 = 60.
3. Apply the payment formula: $20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] = $405.53 per month, rounded to cents.
4. Estimate total interest using the rounded payment: $405.53 × 60 − $20,000 = $4,331.80.

The estimate is therefore a monthly payment of $405.53 and total interest of $4,331.80 across 60 payments, under the stated assumptions.

Assumptions

• The interest rate is fixed for the full repayment term.
• Payments are equal, made monthly, and begin one month after borrowing.
• Interest is compounded monthly using APR ÷ 12.
• Fees, taxes, insurance, PMI, escrow, and any lender-specific charges are not included.

How Home Equity Loan Payments Work

A home equity loan generally provides a lump sum that is repaid over an agreed term. The home is used as collateral, but this calculator only performs payment arithmetic; it does not assess the property, loan eligibility, or the consequences of borrowing. Payment size depends primarily on principal, APR, and term.

At the beginning of a standard amortizing loan, a larger share of each payment goes toward interest because the balance is higher. As the balance falls, more of each level payment goes toward principal. The payment shown here combines both components. It is not the same as the total cost of owning or maintaining a home, nor does it include any separate charges attached to a loan.

How to Use and Interpret the Estimate

• Enter the amount you expect to borrow, not the estimated value of your home.
• Use the annual APR supplied in a lender’s written quote or disclosure. Do not substitute a rate found elsewhere; rates and fees are individual inputs and can change.
• Enter the repayment period in years. For example, a 10-year term means 120 monthly payments.
• Compare the result with the lender’s payment schedule and check whether the quoted payment includes any charges that this calculator excludes.

A longer term usually lowers the scheduled monthly payment for the same principal and rate because repayment is spread across more months. It also means more payments, so total interest can be higher. A shorter term can produce a larger monthly payment while reducing the time over which interest accrues. The calculator does not determine which term is suitable for a particular household.

Costs, Comparisons, and Common Calculation Problems

The payment is only one part of the amount a borrower may need to review. A lender’s documents can show origination or other charges, the amount actually disbursed, payment dates, and the total repayment schedule. Those details are not inputs here. Use the lender’s disclosed figures when checking a real offer, and keep fees separate rather than silently adding them to the loan amount.

When comparing a home equity loan with a home equity line of credit, the repayment structures matter. A home equity loan commonly has a lump-sum advance and a scheduled repayment period; a line of credit can allow borrowing at different times and may have changing balances or rates. This calculator models neither a revolving credit line nor a variable-rate schedule. A fixed-payment estimate should not be used as a forecast for a product whose balance or rate can change.

• Mixing APR formats: Enter 8 for 8%, not 0.08. The formula converts the percentage to a monthly decimal rate.
• Using the wrong term unit: The input is years, not months. Entering 60 means 60 years, not 60 monthly payments.
• Rounding too early: Keep the full monthly-rate calculation until the payment is calculated, then round the payment to cents. The calculator uses the rounded payment to estimate total interest.
• Assuming the result is a quote: Actual payment schedules may reflect fees, different payment timing, or contract terms that are not represented by this formula.

The formula assumes the APR is positive, payments are level, and the rate remains unchanged. It cannot model skipped or late payments, extra principal payments, a changing rate, or a payoff before the scheduled end date. Small differences from a lender’s schedule can also result from rounding conventions and the exact dates on which interest accrues.

Frequently Asked Questions

How do I calculate a home equity loan payment?
Convert APR to a monthly decimal rate by dividing the percentage by 1,200, convert years to months by multiplying by 12, and use the amortizing-payment formula shown above. The result is an estimated principal-and-interest payment.

Does this estimate include closing costs or fees?
No. It calculates a payment from principal, APR, and term only. Review the lender’s disclosure for fees and any other costs, and check whether a quoted payment includes them.

Why does a longer term change total interest?
A longer term spreads repayment across more monthly payments. With the same principal and rate, the monthly payment is generally lower, but interest accrues over a longer period and the estimated total interest can increase.

Can I use this calculator for a home equity line of credit?
Not reliably. A line of credit may have a changing balance, draws at different times, or a rate that changes. This calculator assumes one lump-sum principal balance and equal monthly payments at a fixed rate.

Why might my lender’s payment differ?
The lender may use different payment dates, rounding methods, fees, or contract terms. Compare the inputs and assumptions with the lender’s disclosure rather than treating this estimate as the final schedule.

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

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• Home Equity Loan Calculator: Amount Up to a CLTV Limit and Payment

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 | $ | round(p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)), 2) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2