HELOC Calculator
Calculate monthly payments during draw and repayment periods for a HELOC.
HELOC Calculator
Calculate monthly payments during draw and repayment periods for a HELOC.
Mortgage Payment Formula
ℹ️ Does not include property taxes, homeowner's insurance, or PMI
Disclaimer
Results provided by this calculator are for informational and educational purposes only. They are based on the values you enter and standard formulas, and should not be considered financial, medical, legal, or professional advice. Always consult a qualified professional before making important decisions based on these results. Roughtools makes no warranties regarding the accuracy or completeness of these calculations for your specific situation.
Frequently Asked Questions
Pro Tips
Even a 0.5% lower interest rate saves thousands over the life of a loan. Shop at least 3 lenders and get pre-approval before committing — lenders compete on rate when they know you have options.
Making one extra payment per year directly toward principal can shorten a 30-year mortgage by 4–6 years and save over $30,000 in interest on a typical home loan.
Your Annual Percentage Rate (APR) includes fees the interest rate does not — always compare APR, not just rate, when evaluating lender offers.
Bi-weekly payments (half the monthly amount every 2 weeks) result in 26 half-payments per year — equivalent to 13 full monthly payments instead of 12, accelerating payoff.
When to Use This Calculator
Estimate your monthly payment before house hunting to set a realistic budget and avoid over-extending.
Compare your current payment to a refinanced rate to calculate the break-even point and total interest savings.
15-year vs 30-year mortgage: see the payment difference and total interest cost side-by-side to make an informed choice.
Work backwards from your maximum monthly payment to find the home price and loan amount you can comfortably afford.
Calculate the mortgage cost for an investment property to determine if rental income will cover the payment.
About the HELOC Calculator
This HELOC calculator computes your payments during both the interest-only draw period and the fully-amortizing repayment period of a home equity line of credit. Enter your credit limit, draw amount, interest rate, and period lengths to see how your payment will jump at repayment. Built for homeowners planning HELOC draws for renovations, tuition, or debt consolidation.
How to Use the HELOC Calculator
- 1
Enter your HELOC credit limit in dollars.
- 2
Enter the amount you plan to draw (use) from the line.
- 3
Enter the current interest rate (HELOCs are typically variable).
- 4
Enter the draw period length (typically 10 years) and repayment period (typically 20 years).
- 5
Compare your interest-only draw period payment vs. the higher repayment period payment.
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