Home Equity Loan Fixed-Rate Calculator

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

Formula

The calculator uses the standard fixed-payment amortization formula. It converts the annual percentage rate to a monthly rate, then calculates the level monthly payment that repays the principal and interest over the selected number of months:

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

• P is the amount borrowed, in dollars.
• APR is the annual percentage rate entered as a percentage, such as 8 for 8%.
• r is the monthly rate, calculated as APR ÷ 1,200.
• n is the number of monthly payments, calculated as years × 12.

Total interest is calculated as the rounded monthly payment multiplied by the number of payments, minus the original principal: Total interest = monthly payment × n − P. The payment is rounded to the nearest cent before total interest is calculated, so the result reflects repeated cent-rounded payments.

Worked Example

Using the calculator’s defaults—$20,000 borrowed at 8% APR for 5 years:

1. Monthly rate: 8 ÷ 1,200 = 0.0066667.
2. Number of monthly payments: 5 × 12 = 60.
3. Payment: 20,000 × 0.0066667 ÷ [1 − (1 + 0.0066667)⁻⁶⁰] = $405.53 per month, rounded to cents.
4. Total interest: $405.53 × 60 − $20,000 = $4,331.80.

The figures are estimates under the formula’s assumptions. A lender’s schedule can differ if its disclosed terms, payment dates, fees, or rounding method differ.

Assumptions

• The rate stays fixed for the full repayment term.
• Payments are equal, made monthly, and begin one month after the loan is made.
• Interest accrues monthly at APR ÷ 12; the APR is treated as the annual rate used by this simplified calculation.
• The calculation excludes fees, taxes, insurance, escrow, and any costs not included in the principal or APR input.

How to Use the Estimate

Use the calculator to translate a proposed amount, rate, and term into a monthly principal-and-interest figure. The loan amount should be the amount financed, not necessarily the amount you hope to receive after costs. Enter APR as a percentage number: type 8 for 8%, not 0.08. Enter the repayment period in years. The tool converts years to months internally.

Compare the estimate with the lender’s written payment schedule and disclosures. Confirm whether the quoted APR reflects the same amount financed and repayment period, and whether any fees are paid upfront or added to the balance. If the actual amount financed is higher because costs are included, the payment calculation will also be higher.

A fixed-rate loan generally has a scheduled principal-and-interest payment that remains level, while the share going to interest versus principal changes over time. Early in repayment, more of each payment typically goes to interest; as the balance falls, more goes to principal. This calculator summarizes the payment stream but does not create a month-by-month amortization table.

Understanding Home Equity Loan Costs

A home equity loan is commonly structured as a lump-sum loan secured by equity in a home, with repayment over an agreed term. The calculator covers only the arithmetic for the loan balance, rate, and payment period. It does not determine available equity, eligibility, collateral risk, or lender terms. Those details depend on the specific transaction and must be confirmed with the lender.

The APR and the note rate are not always interchangeable in real loan documents. APR may reflect certain borrowing costs as defined in a lender’s disclosure, while the periodic interest calculation may use the contractual rate and specific servicing conventions. For an accurate estimate, use the rate and amount that match the lender’s quoted payment calculation, and ask how the disclosed APR relates to the payment.

Interest totals here assume every scheduled payment is made on time and in the same amount. Extra payments, skipped or late payments, a different first-payment date, or changes to the balance can alter the actual payoff and interest. The calculator also does not account for whether a payment is allocated under a particular servicing arrangement.

Common Mistakes and Limits

• Entering the wrong rate format: APR must be entered as a percentage, so 8 means 8% per year.
• Using the wrong principal: use the amount borrowed or financed, rather than the home’s value or an equity estimate.
• Confusing payment with total housing cost: the output is principal and interest only, not taxes, insurance, or other household expenses.
• Assuming total interest is exact: the displayed result uses rounded monthly payments and a simplified monthly-rate convention; actual lender calculations may use different details.
• Ignoring term effects: changing the number of years changes both the payment and the total interest. A longer schedule usually spreads repayment across more installments, but this tool is not a recommendation about selecting a term.

The formula is not a loan approval, equity, affordability, or tax calculator. It cannot predict a lender’s quoted rate, fees, or approval decision. Obtain the actual rate, financed amount, payment schedule, and costs from the lender rather than treating the defaults as a market quote.

Frequently Asked Questions

How do I calculate a fixed-rate home equity loan payment?
Convert APR to a monthly rate by dividing it by 1,200, convert the term to months, then apply the amortizing-payment formula shown above. This calculator performs those steps and rounds the monthly payment to cents.

Does a fixed rate mean the payment never changes?
A fixed rate means the interest rate is set for the agreed period. The calculator assumes equal monthly principal-and-interest payments, but it excludes costs or circumstances that could affect a real account’s billed amount.

Does this calculator include closing costs or fees?
No. It calculates principal and interest from the loan amount, APR, and term. Check the lender’s disclosure to see which fees apply, whether any are financed, and how they affect the amount borrowed or APR.

Why is my lender’s payment different?
Differences can arise from the actual financed balance, contractual rate, APR treatment, payment date, fees, rounding, or other terms. Compare the calculator inputs with the lender’s payment schedule and ask the lender to explain any remaining difference.

Can I use this calculator to find how much equity I can borrow?
No. It estimates payment and interest only after you provide a loan amount. It does not calculate home equity, assess collateral, or determine what a lender may offer.

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