HELOC Calculator

Introduction

A HELOC, or Home Equity Line of Credit, lets you borrow money using the value of your home. Think of it like a credit card, but instead of a set limit from a bank, your borrowing limit is based on how much your home is worth minus what you still owe on it. This HELOC calculator helps you figure out how much you could borrow, what your monthly payments might look like, and how much interest you will pay over time. Just enter a few details about your home's value, your current mortgage balance, and the interest rate, and the calculator does the math for you. Whether you want to pay for home repairs, cover big expenses, or consolidate debt, this tool makes it easy to plan ahead and understand your costs before you apply for a HELOC.

How to Use Our HELOC Calculator

Enter your home equity line of credit details below to find out your monthly payment, total interest paid, and overall cost of your HELOC.

HELOC Amount: Type in the total amount of money you plan to borrow from your home equity line of credit. This is the credit limit or the portion you intend to use, entered in dollars.

Interest Rate: Enter the annual interest rate on your HELOC. This is usually a variable rate, so use your current rate or the rate quoted by your lender. Enter it as a percentage. If you want to understand how annual percentage yield differs from your quoted rate, our APY Calculator can help clarify the distinction.

Draw Period: Enter the number of years during which you can borrow money from your HELOC. Most draw periods last 5 to 10 years. During this time, you may only need to pay interest.

Repayment Period: Enter the number of years you have to pay back the balance after the draw period ends. This is when you pay both principal and interest. Repayment periods typically range from 10 to 20 years.

Payment Type During Draw Period: Select whether you will make interest-only payments or principal-and-interest payments during the draw period. Interest-only payments are lower at first but lead to higher payments later.

What Is a HELOC?

A HELOC, or Home Equity Line of Credit, is a type of loan that lets you borrow money using the equity in your home as collateral. Equity is the difference between what your home is worth and what you still owe on your mortgage. Think of a HELOC like a credit card — you get approved for a maximum amount, and you can borrow from it as needed, pay it back, and borrow again during what's called the draw period.

How Does a HELOC Work?

A HELOC has two main phases:

• Draw Period: This usually lasts 5 to 10 years. During this time, you can take out money up to your credit limit. Most lenders only require you to make interest-only payments during the draw period, which keeps your monthly costs low. However, you can choose to pay toward the principal as well.
• Repayment Period: Once the draw period ends, you can no longer borrow money. You must now pay back both the principal (the amount you borrowed) and interest. This phase typically lasts 10 to 20 years. Monthly payments during this phase are higher because you are paying down the actual loan balance.

HELOC Interest Rates

Most HELOCs come with a variable interest rate, which means your rate can go up or down over time. The rate is usually based on the Wall Street Journal Prime Rate plus a margin set by your lender. For example, if the prime rate is 8.50% and your lender's margin is 0.50%, your HELOC rate would be 9.00%. Because the rate is variable, your monthly payment can change — sometimes by a lot. That's why it's important to plan for the possibility of rate increases.

Some lenders offer introductory rates — a lower fixed or variable rate for the first 6 to 24 months. This can save you money early on, but be sure to understand what your rate will jump to once the intro period ends.

Rate Discounts and Fees

Many lenders offer small rate discounts if you set up autopay from a checking account at their bank or if you already have an existing banking relationship with them. These discounts are usually between 0.25% and 0.50%, but they can add up to real savings over the life of the loan. On the other side, be aware of potential costs like closing fees (for the appraisal, title search, and application) and annual fees that some lenders charge just to keep the line open.

How to Use This HELOC Calculator

This calculator helps you estimate your monthly payments during both the draw period and the repayment period. Enter your HELOC line amount, how much you plan to borrow, your interest rate, and the length of each phase. You can also factor in introductory rate offers, rate discounts, extra monthly payments, and fees. The calculator will show you a full payment summary, an amortization schedule, and a chart of how your balance and payments change over time.

The rate change scenarios feature is especially useful. Since HELOCs have variable rates, this tool shows you what your payments and total interest would look like if rates rise by 1%, 2%, or 3%. This helps you prepare for a worst-case scenario and decide if a HELOC is the right choice for your situation.

HELOC vs. Other Loan Options

Before committing to a HELOC, it's worth comparing it to other borrowing options. If you're considering refinancing your mortgage, you may be able to access your equity at a fixed rate instead. For those who want to pay off their existing mortgage faster, our Mortgage Payoff Calculator and Mortgage Extra Payment Calculator can show how additional payments shorten your loan term and reduce total interest. If your goal is purchasing a vehicle rather than tapping home equity, an Auto Loan Calculator may be more appropriate for estimating those costs.

When Does a HELOC Make Sense?

HELOCs are commonly used for home improvements, debt consolidation, large expenses, or as an emergency fund. They often have lower interest rates than credit cards or personal loans because your home secures the debt. However, this also means your home is at risk if you cannot make payments. Only borrow what you can comfortably repay, and always account for the possibility that interest rates could rise during the life of your HELOC. If you're an investor evaluating rental property purchases with your HELOC funds, our Cap Rate Calculator can help you assess whether the potential return justifies the borrowing cost.

Frequently Asked Questions

What is the difference between the HELOC line amount and the amount planned to use?

The HELOC line amount is the maximum credit limit your lender approves. The amount planned to use is how much you actually plan to borrow from that line. For example, you might get approved for $100,000 but only need $80,000. You only pay interest on the amount you actually use, not the full line.

What does interest-only payment mean during the draw period?

Interest-only means you only pay the interest that builds up each month. You do not pay down any of the money you borrowed. This keeps your monthly payment low during the draw period, but your full balance stays the same. Once the repayment period starts, your payment goes up because you must pay back both the principal and interest.

What happens when the draw period ends?

When the draw period ends, you can no longer borrow money from your HELOC. The repayment period begins, and your monthly payment usually goes up. You now pay both principal and interest each month until the balance is paid off. This payment increase can be significant, so plan ahead.

How does the extra monthly payment work in this calculator?

The extra monthly payment is an additional amount you choose to pay on top of your required payment. It goes straight toward your principal balance during both the draw and repayment periods. Making extra payments helps you pay off your HELOC faster and reduces the total interest you pay over the life of the loan.

What is the WSJ Prime Rate and why does it matter?

The WSJ Prime Rate is a benchmark interest rate published by the Wall Street Journal. Most HELOC rates are calculated as the prime rate plus a margin set by your lender. When the prime rate goes up, your HELOC rate goes up too. This is why HELOC payments can change over time.

What is the lender margin?

The lender margin is a fixed percentage your lender adds on top of the prime rate to set your HELOC interest rate. For example, if the prime rate is 8.50% and your margin is 0.50%, your rate is 9.00%. The margin stays the same for the life of your HELOC, but the prime rate can change.

How do the rate discount checkboxes work?

Many lenders offer small discounts on your interest rate. The autopay discount (−0.25%) applies if you set up automatic payments. The loyalty discount (−0.50%) applies if you already bank with the lender. You can also enter a custom discount. These discounts are subtracted from your base rate to give you a lower effective rate.

What is an introductory rate on a HELOC?

An introductory rate is a lower interest rate some lenders offer for the first few months of your HELOC, usually 6 to 24 months. It can be fixed or variable. After the intro period ends, your rate goes back to the standard variable rate. Check the "I have an introductory rate offer" box in the calculator to see how it affects your payments.

What do the rate change scenarios show?

Since HELOCs have variable rates, your rate can increase over time. The rate change scenarios show what your draw payment, repayment payment, and total interest would be if your rate goes up by 1%, 2%, or 3%. This helps you understand the risk and plan for higher payments in the future.

What are closing costs on a HELOC?

Closing costs are one-time fees you pay when opening a HELOC. They can include an application fee, home appraisal, title search, and other charges. Not all lenders charge closing costs, but if they do, these fees add to your total borrowing cost. Enter them in the calculator to see the full picture.

What is the annual fee on a HELOC?

Some lenders charge a yearly fee just to keep your HELOC open, whether you use it or not. This fee is usually between $25 and $75 per year. The calculator adds up all annual fees over the life of the loan and includes them in your total cost.

What does the amortization schedule show?

The amortization schedule is a detailed table that shows your payment, principal paid, interest paid, extra payment, remaining balance, and cumulative interest for each period. You can view it by year or by month. It helps you see exactly how your balance decreases over time and how much of each payment goes to interest versus principal.

What does the Update APR button do?

The Update APR button takes the WSJ Prime Rate and Lender Margin values you entered, adds them together, and updates the Interest Rate (APR) field. This makes it easy to calculate your rate based on the standard prime-plus-margin formula most lenders use.

What is the effective APR shown in the results?

The effective APR is your interest rate after any discounts are applied. If you selected autopay, loyalty, or custom discounts, those are subtracted from your base rate. The effective APR reflects the actual rate used to calculate your payments and total interest.

Can I choose principal and interest payments during the draw period?

Yes. Use the "Draw Period Payment Type" dropdown to select "Principal + Interest" instead of "Interest-Only." This means you start paying down your balance right away during the draw period. Your monthly payments will be higher, but you will owe less when the repayment period begins and pay less total interest.

How is the payoff date calculated?

The payoff date is based on today's date plus the total number of months it takes to pay off your HELOC. It adds the draw period and repayment period together. If you make extra payments, the payoff date may be earlier because you are reducing the balance faster.

What does the total cost (all-in) include?

The total cost includes the amount you borrowed, all the interest you paid over the life of the loan, closing costs, and all annual fees. It gives you the full picture of what your HELOC will cost from start to finish.

Why is my repayment period payment so much higher than my draw period payment?

During the draw period with interest-only payments, you only pay the interest that accrues each month. During the repayment period, you pay both principal and interest, which makes the payment much higher. The shorter your repayment period, the bigger this jump will be.