HELOC Calculator

What is a HELOC?

A home equity line of credit, or HELOC, lets you borrow against the equity in your home. This home equity line of credit calculator estimates how much credit may be available based on your home value, mortgage balance and lender’s maximum combined loan-to-value ratio.

A HELOC works like a revolving line of credit: you can draw money as needed, up to your approved limit. The rate is variable, so your borrowing cost and payment may change. During a draw period, payments are often interest-only. During the repayment period, you pay back principal and interest under the lender’s terms.

Why a HELOC matters

The credit limit is only one part of the decision. Your payment affects the money available for housing costs, savings and other bills. Estimating both the line and its payments can help you decide whether to borrow, how much to draw and whether the repayment terms fit your budget.

A HELOC may give you access to funds over time, but your home secures the debt. Borrowing more can raise your payments and leave less equity in your home. Review the lender’s rate, fees, payment rules and repayment terms before you apply. The CFPB’s home equity lines of credit information can help you understand questions to ask.

How to use this HELOC calculator

1. Enter your home’s estimated value. A current, realistic estimate helps make the available-credit calculation more useful.
2. Enter your remaining mortgage balance. Include the amount you still owe, not the home’s original purchase price or loan amount.
3. Enter the lender’s maximum combined loan-to-value ratio. This is the lender’s limit for total borrowing secured by the home, expressed as a percentage of its value.
4. Enter the amount you plan to draw and the HELOC rate. Use the rate and draw amount you are considering, rather than assuming you will borrow the full available line.
5. Enter the repayment period in years. Check the lender’s offer for the applicable term and payment rules.
6. Review the available credit and both payment estimates. Compare the payments with your budget, and test other inputs if you are weighing a smaller draw or different lender terms.

HELOC calculator example

How to read your HELOC results

The available line is calculated as home value multiplied by the maximum combined loan-to-value ratio, minus the mortgage balance. It is an estimate of potential credit under those inputs, not a promise of approval. A lender may use its own home valuation and underwriting requirements.

The draw-period payment shown is interest-only. The repayment-period payment estimates paying back the drawn balance over the entered repayment period. Your actual bill depends on the balance, rate and lender’s terms. Because the rate is variable, do not assume today’s estimated payment will stay the same for the life of the line.

How to make a HELOC work better for your budget

1. 01

   Borrow only what you need

   A larger available line does not mean you need to use it. Estimate the cost of the project or expense first, then enter a draw that matches the amount you expect to use.

2. 02

   Check your home value and mortgage balance

   Use a defensible home value estimate and a recent mortgage balance. If either input is off, the estimated line may not reflect your situation.

3. 03

   Compare lender terms

   Ask lenders how they set the variable rate, calculate payments and handle the transition from drawing funds to repayment. Compare the full terms, not just the initial payment estimate.

4. 04

   Plan for repayment before drawing

   Set aside room in your budget for the repayment-period payment, not only the interest-only payment. Consider whether you could manage a higher bill if the variable rate changes.

5. 05

   Reduce other secured debt when practical

   Paying down your mortgage can affect the calculator’s estimate because the formula subtracts the mortgage balance. Consider the effect on your wider finances before using cash to pay down debt.

Common HELOC calculator mistakes

• Treating the estimated line as guaranteed

  The calculator applies your inputs to the formula. The lender makes the approval decision and may use a different valuation or other requirements.

• Confusing available credit with the planned draw

  The available line is the estimated borrowing limit. The draw is the amount you plan to take out. The payment estimate is based on the draw, not automatically on the full line.

• Assuming the interest-only payment lasts

  The draw-period payment does not show what you will owe in the repayment period. Review both estimates and the lender’s payment schedule.

• Assuming the rate will not change

  A HELOC has a variable rate. A payment estimate based on the rate you enter may not match a later bill if the rate changes.

The HELOC formula

Key terms

Combined loan-to-value ratio (CLTV)

The total borrowing secured by a home compared with the home’s value. The calculator uses the lender’s maximum CLTV to estimate the line available.

Draw period

The period when you can draw funds from the HELOC, subject to the lender’s terms. Payments during this period are often interest-only.

Repayment period

The period when you repay what you borrowed under the HELOC’s terms.

Interest-only payment

A payment that covers interest on the drawn balance but does not pay down the principal.