Estimate monthly payments, total interest costs, and available credit for a home equity line of credit. This tool helps homeowners, loan applicants, and financial planners model HELOC repayment scenarios. Use it to compare rates, draw periods, and repayment terms before applying for a line of credit.
🏦 Home Equity Line of Credit (HELOC) Calculator
Estimate payments, interest costs, and available credit for your HELOC
HELOC Calculation Results
How to Use This Tool
Enter your current home value, outstanding mortgage balance, and the maximum LTV ratio your lender offers (typically 70-85%). Input the annual interest rate, compounding frequency, draw period, and repayment period from your HELOC offer. Add the initial amount you plan to draw from the line of credit, then click Calculate to see detailed payment and cost breakdowns.
Use the Reset button to clear all fields and start a new calculation. Click Copy Results to save your calculation to your clipboard for reference when comparing lender offers.
Formula and Logic
This calculator uses standard HELOC repayment logic:
- Available HELOC Credit = (Home Value × (LTV Ratio / 100)) - Outstanding Mortgage Balance
- Draw Period Monthly Interest-Only Payment = (Initial Draw × (Annual Interest Rate / 100)) / 12
- Total Draw Period Interest = Initial Draw × (Annual Interest Rate / 100) × Draw Period Years
- Repayment Period Monthly Payment uses the standard amortization formula: P × (r(1+r)^n) / ((1+r)^n - 1), where P is initial draw, r is monthly interest rate, n is total repayment months
- Total Full Term Interest = Draw Period Interest + (Repayment Monthly Payment × Repayment Months - Initial Draw)
- Total HELOC Cost = Initial Draw + Total Full Term Interest
Calculations assume a fixed interest rate for the full term and no additional draws or payments during the draw period.
Practical Notes
- HELOC interest rates are typically variable, tied to the prime rate, so your payments may change if market rates rise.
- Interest paid on HELOC funds used for home improvements may be tax-deductible in some regions, consult a tax professional for details.
- Lenders may charge annual fees, origination fees, or early termination fees not included in this calculation.
- Draw periods usually range from 5-10 years, with repayment periods of 10-20 years common for most HELOC products.
- Exceeding your credit limit or missing payments can result in penalties or conversion to a fixed-rate loan.
Why This Tool Is Useful
HELOC terms vary widely between lenders, and small differences in interest rates or repayment periods can add up to thousands of dollars in extra costs over the life of the loan. This tool lets you model multiple scenarios to find the most affordable option for your budget. It helps you avoid over-borrowing by showing your maximum available credit upfront, and clarifies the difference between interest-only draw payments and full principal+interest repayment amounts.
Frequently Asked Questions
Is HELOC interest tax-deductible?
Interest on HELOC funds used to buy, build, or substantially improve your primary residence may be tax-deductible if you itemize deductions. There are limits on the total mortgage debt eligible for deductions, so consult a tax professional to confirm your eligibility.
Can I pay down principal during the draw period?
Yes, most HELOCs allow you to make principal payments during the draw period, which reduces your outstanding balance and total interest costs. This calculator assumes no principal payments during the draw period for simplicity.
What happens if I can't repay my HELOC?
Defaulting on a HELOC can lead to foreclosure, as the line of credit is secured by your home. Contact your lender immediately if you're struggling to make payments, as they may offer modification options or interest-only payment extensions.
Additional Guidance
Always compare HELOC offers from at least 3-5 lenders to find the best rate and terms for your financial situation. Check for hidden fees like annual maintenance fees, draw fees, or prepayment penalties before signing a contract. Only borrow what you need, as HELOC debt is secured by your home and missed payments put your property at risk. Consider setting up automatic payments to avoid late fees, and review your monthly statements to track your outstanding balance and interest charges.