Borrowing Equity From Your Home Loan Calculator

This calculator estimates the monthly payment and total interest on a fixed-rate loan secured by home equity, using the amount borrowed, APR and term you enter. It does not determine how much equity a lender will let you borrow; enter a proposed loan amount and compare the estimate with the lender’s written terms.

Formula

The calculator uses the standard fixed-payment amortization formula. It first finds the monthly payment, then subtracts the amount borrowed from the sum of all rounded monthly payments to estimate total interest.

• P is the loan amount 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.
• M is the monthly payment, rounded to the nearest cent: M = P × r ÷ [1 − (1 + r)⁻ⁿ].
• Total interest = M × n − P, using the rounded monthly payment.

This is a payment estimate for a single, fully amortizing loan with a fixed rate and equal monthly payments. It does not calculate available home equity, lender fees or a rate offer. Use figures supplied for the specific loan when available.

Worked Example

Using the calculator’s defaults: P = $20,000, APR = 8%, and term = 5 years.

1. Convert APR to a monthly rate: r = 8 ÷ 1,200 = 0.0066667.
2. Convert the term to payments: n = 5 × 12 = 60.
3. Apply the payment formula: M = 20,000 × 0.0066667 ÷ [1 − (1.0066667)⁻⁶⁰] = $405.53 per month, rounded to cents.
4. Calculate total interest using that 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. Actual payment schedules can differ if a lender uses different timing, fees or terms.

Assumptions

• The interest rate stays fixed for the entire term.
• Payments are equal monthly payments made at the end of each monthly period.
• Interest is compounded monthly at APR ÷ 12.
• Fees, taxes, insurance, mortgage insurance and escrow are not included.
• The calculator assumes every scheduled payment is made on time and does not model extra payments or a changing balance from further borrowing.

What Borrowing Home Equity Means

Home equity is the difference between a home’s value and the balances of loans secured by it. Borrowing against that equity means taking on debt that is secured by the home. Depending on the product, money may arrive as a lump sum or be available to draw over time. A home-equity loan commonly has a repayment schedule for a set amount; a home-equity line of credit generally allows borrowing and repayment within its contract terms. Product details vary, so the calculator’s fixed-rate, lump-sum model may not match a line of credit or a loan with a variable rate.

Equity is not automatically cash available to borrow. A lender may consider its valuation of the property, existing secured debt, repayment capacity and other factors. The amount offered and the conditions are lender-specific. This calculator does not estimate an approval, borrowing limit or usable equity. Ask the lender for the amount, rate, fees, payment schedule and whether the rate can change.

How to Use the Estimate

Enter the proposed principal, annual APR and repayment term. The principal should be the amount financed, not necessarily the amount you expect to receive after any deductions. The result helps show the relationship between these inputs: a larger amount or higher rate generally increases the payment; a longer term generally lowers the scheduled payment but can increase total interest because payments continue for more months.

For example, someone considering $20,000 for a defined expense could use the estimate to see what the stated rate and term imply before including other costs. That is not a measure of whether the debt is affordable or appropriate. Compare the estimate with the complete disclosure and household budget, including existing mortgage payments and other obligations. A payment figure alone does not capture the risk of pledging a home as security.

Costs, Risks and Comparisons

Interest is only one part of the cost of borrowing. A loan may have upfront or ongoing charges, and the contract determines when they are due and whether they are financed. If a fee is added to the principal, the payment calculation should use the financed amount rather than the cash proceeds. Ask for a written breakdown of fees, the total repayment amount, payment dates, and any conditions that could change the rate or payment.

Because the debt is secured by the home, failure to meet the agreement can have consequences for the property, including possible enforcement of the security. The exact consequences depend on the contract and applicable rules. Consider the repayment plan if income changes, expenses rise or the home is sold. Borrowing against equity also reduces the equity remaining in the property; it does not create income or remove the underlying debt.

Compare products by looking beyond the advertised payment: check whether the rate is fixed or variable, how long payments last, how the balance is repaid, what fees apply, and whether there are restrictions or charges for particular actions. A lower payment over a longer term does not necessarily mean a lower total cost. For a variable-rate or revolving product, this calculator cannot show future payments accurately because the balance, rate or draw pattern may change.

Common Calculation Mistakes and Limits

• Entering 0.08 instead of 8 for an APR of 8%. The input is a percentage, and the formula divides it by 1,200.
• Using the property’s estimated value as the loan amount. Enter the proposed amount borrowed, not the home value or total equity.
• Assuming the displayed payment includes fees, taxes or insurance. It does not.
• Interpreting total interest as the full cost of credit. It excludes charges and depends on the stated assumptions.
• Relying on rounded estimates as a payment quote. The lender’s schedule may use different dates, rounding or contract terms.

The formula is not suitable for an interest-only period, a changing rate, irregular payments, a draw-and-repay credit line, or extra principal payments. It also cannot calculate tax treatment, legal rights, lender eligibility or the value of a home. Those details require current information from the relevant provider or qualified source.

Frequently Asked Questions

Can I borrow equity from my home loan?
Equity may be used as security for a separate home-equity loan or credit line, subject to the product and lender’s assessment. The existing mortgage and other secured balances matter; this calculator does not establish eligibility or available credit.

Does this calculator tell me how much equity I can borrow?
No. It estimates payments and interest for an amount you enter. A lender determines any amount offered using its own valuation, criteria and contract terms.

Is a home-equity loan the same as refinancing?
No. A home-equity loan is generally an additional loan secured by the home, while refinancing replaces an existing loan with a new one. The structures, costs and effects on existing debt can differ.

Why might my lender’s payment differ from this result?
The lender may include financed fees, use different payment dates or rounding, or offer a variable rate or different repayment structure. Check the loan disclosure and payment schedule for the exact figures.

Does a longer term reduce the total interest?
Not necessarily. A longer term can reduce the scheduled monthly payment while increasing the number of months interest accrues. The calculator illustrates that trade-off only for the rate and assumptions entered.

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

Related

• Repayment Calculator With Extra Payments
• Recurring Payments With Square: Plans, Fees, and Setup
• Reg E Recurring Payments: Rules and Cancellation

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