American homeowners are sitting on a record $21.6 trillion in tappable home equity as of Q1 2026, according to TransUnion. Over 85 million homeowners have at least 20% equity in their properties, with a median of $277,000 available to borrow. A Home Equity Line of Credit (HELOC) lets you tap into that equity through a revolving credit line that works like a credit card. You draw funds as needed during the draw period and repay the balance during a separate repayment period. The average HELOC rate stood at 7.43% in July 2026, according to Bankrate's national survey, down from nearly 9% in early 2025. With HELOC originations rising 15.8% year over year, more homeowners are choosing this flexible borrowing tool over cash-out refinancing.
What This Calculator Does
Enter your home value, mortgage balance, draw amount, interest rate, and loan terms. The calculator shows your interest-only draw period payment, your fully amortizing repayment period payment, total interest cost, and combined loan-to-value ratio (CLTV) to check lender eligibility.
For related borrowing tools, try our Home Equity Loan Calculator to compare a fixed lump sum alternative, or our Mortgage Calculator for your primary mortgage payment. You can also use our Debt-to-Income Ratio Calculator to check whether adding a HELOC fits your budget.
Inputs Required
- Home Value: Current estimated market value of your property
- Mortgage Balance: Remaining balance on your primary mortgage
- Draw Amount: Amount you plan to draw from the HELOC
- Interest Rate: Current variable rate offered by the lender
- Draw Period: How long you can borrow from the line (typically 5 to 15 years)
- Repayment Period: How long you have to repay the balance after the draw period ends
Outputs Provided
- Draw Period Payment: Interest-only monthly payment during the draw period
- Repayment Period Payment: Fully amortizing payment once the draw period ends
- Total Interest: Combined interest across both periods
- CLTV: Combined loan-to-value ratio to check lender eligibility
How the Calculation Works
Draw Period Payment = Draw Amount x (Rate / 12)
Repayment Payment = Standard amortization on draw balance
CLTV = (Mortgage Balance + Draw Amount) / Home Value x 100
During the draw period, you pay interest only on the amount drawn. When the draw period ends, the outstanding balance becomes fully amortizing, meaning you pay both principal and interest. This transition causes a significant jump in monthly payments, sometimes called payment shock. TransUnion estimates that roughly 415,000 HELOCs will reach the end of their draw period within the next twelve months, making this transition a pressing financial event for many borrowers.
Most lenders require a combined loan-to-value ratio at or below 85%, meaning the total of your mortgage and HELOC cannot exceed 85% of your home's value. Some credit unions allow higher limits. The exact cap depends on the lender, your credit score, and your income. Borrowers with credit scores above 760 and CLTV ratios below 70% receive the best rates, according to July 2026 Curinos data.
How to Use the Calculator
- Enter your home's current market value
- Input your remaining mortgage balance
- Enter the amount you plan to draw from the HELOC
- Input the current interest rate from your lender (the July 2026 average is 7.43%)
- Select your draw period and repayment period lengths
- Toggle between draw and repayment views to compare payments
- Check the CLTV indicator to confirm eligibility
Example Calculation
A homeowner with a $400,000 home and $250,000 mortgage opens a HELOC and draws $40,000 at 7.43% with a 10-year draw period and 20-year repayment period:
- Available equity: $150,000
- CLTV: ($250,000 + $40,000) / $400,000 = 72.5% (within 85% limit)
- Draw period monthly payment (interest-only): approximately $248
- Repayment period monthly payment: approximately $319
- Total interest over full term: approximately $44,560
Compared to the average credit card APR of 19.57% in 2026, financing $40,000 through a HELOC at 7.43% saves over $4,800 per year in interest alone. This is why homeowners increasingly turn to home equity products instead of revolving credit card debt.
Real-World Scenarios
Staged Home Renovation in Austin
A homeowner in Austin, Texas plans a $60,000 kitchen and bathroom renovation in phases over three years. Their home is worth $520,000, and they owe $310,000 on their primary mortgage, giving them $210,000 in equity. They open a HELOC at 7.2% and draw $20,000 per year as each phase begins. During the draw period, they pay interest only on what they have drawn, keeping monthly costs manageable. By drawing in stages rather than taking a lump sum, they save approximately $2,160 in interest compared to borrowing the full $60,000 upfront, since interest accrues only on the drawn balance.
Emergency Financial Buffer for a Freelancer
A self-employed graphic designer in Denver opens a $50,000 HELOC as a financial safety net. Her home is worth $480,000 with a $290,000 mortgage balance, giving her a comfortable CLTV of 60% even if she drew the full amount. The credit line sits unused for eight months, costing nothing. When a major client delays payment by 60 days, she draws $8,000 to cover operating expenses and repays it within three months. The total interest cost for that brief borrowing period is under $150, far cheaper than putting expenses on a credit card at 22% APR.
Approaching Draw Period End in Phoenix
A retired couple in Phoenix opened a HELOC in 2016 with a 10-year draw period. In 2026, that draw period is ending. They have drawn $45,000 and have been paying approximately $280 per month in interest-only payments. Using the calculator, they discover their repayment period payment will jump to approximately $350 per month at their current rate of 7.43%. This $70 monthly increase, known as payment shock, prompts them to budget for the transition and explore whether their lender offers a rate-lock option to convert part of the balance to a fixed rate before repayment begins.
Common Mistakes to Avoid
- Treating the draw period as free money: Interest-only payments mean your principal balance does not shrink during the draw period. You still owe the full amount drawn at the end. TransUnion reports that approximately 415,000 HELOCs will reach draw period end in the next twelve months, and many borrowers are unprepared for the payment increase
- Not planning for rate increases: HELOC rates are tied to the prime rate. A 2% rate increase on a $50,000 balance adds about $83 per month to your interest-only payment. Bankrate analysts predict rates will stay around 7% for the remainder of 2026, but even small shifts compound over a 20-year repayment period
- Drawing the maximum available: Borrowing the maximum reduces your financial flexibility and raises your CLTV, which can affect refinancing options later. Lenders offer their best rates when CLTV is at or below 80%, with even better deals for CLTVs between 70% and 75%
- Confusing HELOC with home equity loan: A HELOC is a revolving credit line with a variable rate. A home equity loan is a fixed lump sum with a fixed rate. Choose based on whether your need is ongoing or one-time. HELOCs currently average 7.43% variable, while home equity loans average 8.08% fixed as of July 2026
- Overlooking closing costs: HELOCs may carry appraisal fees, origination fees, and annual maintenance fees ranging from $0 to $1,000. Some lenders charge early closure fees if you close the line within the first three years. Factor these into your total cost comparison
Limitations of This Calculator
This calculator assumes a constant interest rate throughout the draw and repayment periods. In reality, HELOC rates are variable and tied to the prime rate, so your actual payments will change as market rates shift. The calculator does not account for introductory or teaser rates, which some lenders offer at reduced rates for the first 6 to 12 months. It does not include closing costs, appraisal fees, annual maintenance fees, or early closure penalties. The CLTV calculation provides a general eligibility check, but each lender applies its own underwriting criteria including credit score minimums, debt-to-income ratio limits, and income verification requirements. For a precise quote, consult a licensed lender directly.
Authoritative Research and Resources
- Consumer Financial Protection Bureau: What is a HELOC? - The CFPB's official consumer guide explaining how HELOCs work, the risks involved, and your rights as a borrower under federal lending laws.
- Bankrate: Current HELOC Rates - Bankrate's weekly national survey of the 10 largest banks and thrifts across 10 major US markets, tracking HELOC rate trends with historical data going back to the early 1980s.
- TransUnion: Q1 2026 Home Equity Trends Report - TransUnion's quarterly analysis of tappable home equity ($21.6 trillion as of Q1 2026), origination volumes, and borrower demographics across the US housing market.