Finance

HELOC Calculator

Calculate your available home equity, maximum HELOC amount, and compare interest-only vs. principal and interest monthly payments.

Quick Answer

Your maximum HELOC amount equals your home value times the lender's CLTV limit (typically 80%) minus your current mortgage balance. On a $500,000 home with a $300,000 mortgage at 80% CLTV, you could access up to $100,000. Interest-only payments on a $50,000 draw at 8.5% would be about $354/month.

$
$
60%80% (typical)95%
$
%
Total Home Equity
$200,000
Max HELOC Amount
$100,000
at 80% CLTV
CLTV After Draw
70.0%
Current LTV: 60.0%

Monthly Payment on $50,000 Draw

Interest-Only Payment
$354.17
Total interest over 20 years: $85,000
Principal still owed at end: $50,000
Principal + Interest Payment
$433.91
Total interest over 20 years: $54,139
Fully paid off at end of term

Interest-only payments are lower during the draw period but you must repay the full principal later. P+I payments build equity and fully repay the line over the repayment period.

Equity Breakdown

Home Value
$500,000
Mortgage Balance
-$300,000
Total Equity
$200,000
Max Borrowable (80% CLTV)
$400,000
Less: Mortgage Balance
-$300,000
Available for HELOC
$100,000
Disclaimer:This calculator provides estimates for informational purposes only. Actual HELOC terms, rates, credit limits, and qualification requirements vary by lender. HELOC rates are typically variable and can change over time. Home values are based on your input and may differ from a lender's appraisal. This is not financial advice. Consult a qualified mortgage professional or financial advisor before taking out a HELOC.

About This Tool

The HELOC Calculator helps homeowners determine how much they can borrow against their home equity through a Home Equity Line of Credit. By entering your home's current value, mortgage balance, lender CLTV limit, desired draw amount, and interest rate, you get an instant estimate of your maximum HELOC amount and monthly payment options.

A HELOC is one of the most flexible ways to access the equity you have built in your home. Unlike a home equity loan that provides a lump sum, a HELOC works like a credit card with a revolving credit line. You draw funds as needed during the draw period, pay interest only on what you borrow, and can repay and re-borrow throughout the draw period. This makes HELOCs popular for home renovations, education expenses, debt consolidation, and emergency funds.

How HELOC Limits Are Calculated

Lenders determine your maximum HELOC amount using the Combined Loan-to-Value (CLTV) ratio. Most lenders cap the CLTV at 80%, meaning the total of your first mortgage plus the HELOC cannot exceed 80% of your home's appraised value. Some lenders will go up to 85% or even 90% CLTV for borrowers with excellent credit and strong income. The formula is simple: Maximum HELOC = (Home Value x CLTV Limit) minus Current Mortgage Balance.

Interest-Only vs. Principal and Interest Payments

During the draw period (typically 5-10 years), most HELOCs require only minimum interest payments on the outstanding balance. This keeps payments low but means you are not reducing the principal. Once the draw period ends, you enter the repayment period (10-20 years) where you must pay both principal and interest. The payment increase can be substantial, so it is important to plan for the transition. This calculator shows both payment types side by side so you can prepare for each phase.

Variable Rates and Your Budget

HELOC interest rates are almost always variable, tied to the prime rate plus a margin based on your creditworthiness. When interest rates rise, your HELOC payment increases too. For budgeting purposes, it is wise to stress-test your payments at a rate 2-3% higher than your current rate to ensure you can still afford the payments if rates increase. Some lenders offer a fixed-rate conversion option that lets you lock in a portion of your HELOC balance at a fixed rate, providing more payment predictability.

When a HELOC Makes Sense

A HELOC is ideal when you need flexible access to funds over time, such as for phased home renovation projects or as a financial safety net. It is also useful for homeowners who want to consolidate higher-interest debt at a lower rate. However, because your home serves as collateral, there is real risk involved. If you cannot make payments, you could face foreclosure. Only borrow what you can comfortably repay, and consider whether the purpose of the borrowing genuinely improves your financial position.

Frequently Asked Questions

What is a HELOC and how does it work?
A HELOC (Home Equity Line of Credit) is a revolving line of credit secured by your home. It works similarly to a credit card: you have a credit limit based on your home equity, and you can borrow, repay, and re-borrow during the draw period (typically 5-10 years). After the draw period ends, you enter the repayment period (10-20 years) where you pay back the principal plus interest. During the draw period, many HELOCs require only interest payments.
How much HELOC can I qualify for?
Most lenders allow you to borrow up to 80-85% of your home's appraised value, minus your existing mortgage balance. This is your Combined Loan-to-Value (CLTV) ratio. For example, if your home is worth $500,000 and your mortgage balance is $300,000, at 80% CLTV you could borrow up to $100,000 ($500,000 x 80% = $400,000 - $300,000). Some lenders may go up to 90% CLTV for borrowers with excellent credit.
What is the difference between a HELOC and a home equity loan?
A HELOC is a revolving line of credit with a variable interest rate, where you borrow as needed up to your limit. A home equity loan is a lump-sum loan with a fixed interest rate and fixed monthly payments. Choose a HELOC if you need flexibility and plan to borrow varying amounts over time (like ongoing renovations). Choose a home equity loan if you need a specific amount and want predictable fixed payments.
Are HELOC interest payments tax deductible?
HELOC interest may be tax deductible if the funds are used to buy, build, or substantially improve the home that secures the loan. Under the Tax Cuts and Jobs Act, interest on home equity debt used for other purposes (debt consolidation, tuition, etc.) is generally not deductible. The total mortgage debt limit for deductibility is $750,000 for loans originated after December 15, 2017. Consult a tax professional for your specific situation.
What happens if my home value drops below my HELOC balance?
If your home value drops, you could end up 'underwater' where you owe more than your home is worth. Lenders may freeze or reduce your HELOC credit line if they determine your home value has significantly decreased. You would still owe the outstanding balance regardless of the home's current value. This is why it is important to borrow conservatively and not max out your available equity.
What are typical HELOC interest rates?
HELOC rates are typically variable, tied to the prime rate plus a margin based on your creditworthiness. As of 2026, typical HELOC rates range from 7.5% to 10% for borrowers with good credit. Some lenders offer introductory fixed rates for the first 6-12 months. The rate can change monthly or quarterly depending on market conditions. Because rates are variable, your monthly payment can increase or decrease over time.

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