This HELOC calculator estimates the monthly payment to amortize a drawn home equity line balance. Enter the drawn principal, annual rate, and repayment months. Results include payment, total paid, and total interest.
Homeowners use it when a draw period ends, when they want to pretend a revolving balance is on a fixed payoff plan, or when comparing a HELOC draw to a closed end loan. Confirm live HELOC terms with your lender.
How the payment is calculated
The tool uses a standard amortizing PMT on the drawn amount, annual rate, and month count. It does not track unused credit, interest only minimums, or future draws.
Worked example
Drawn amount $40,000, rate 8.5 percent, 120 months. Monthly payment is about $495.94.
| Input | Value |
|---|---|
| Drawn principal | $40,000 |
| Rate | 8.5% |
| Months | 120 |
| Monthly payment | ~$495.94 |
How to use the calculator
- Enter the balance you intend to repay, not the full line if you have not drawn it.
- Enter a current or stress test annual rate.
- Enter repayment months that match your plan or lender schedule.
- Compare payment against budget and the debt to income calculator.
Draw period versus repayment
Many HELOCs allow interest focused payments while the line is open, then require amortization later. This page focuses on amortizing the drawn amount. If you are still in a draw period, the live minimum due may be lower than this fully amortizing estimate.
Variable rate risk
If the index rises, payment capacity shrinks. Stress the rate upward before relying on a HELOC for long projects. For first mortgage payoff experiments, see the mortgage payoff calculator on this site.
Common mistakes
- Entering the full credit limit when only part is drawn
- Ignoring that variable rates can move after you calculate
- Treating interest only quotes as equal to amortizing payments
- Forgetting closing or annual fees outside the PMT
Planning draws without overborrowing
Because a HELOC can be drawn in pieces, people sometimes treat the line like free cash. Amortizing the drawn amount with this calculator restores discipline. Before each draw, enter the new projected balance and see the payment that would clear it on your chosen schedule.
If you only pay interest during a draw period, principal stays flat and later amortizing payments can jump. Running the amortizing view early shows that future payment before you spend.
Rate resets and budget stress
Variable HELOC rates move with indexes and lender margins. Add one to three percentage points in a stress run. If the stressed payment breaks the budget, reduce the planned draw or shorten other debts first.
Some HELOCs have floors or introductory rates. Enter the rate that will apply for most of the repayment life, not only a teaser.
- Keep first mortgage and HELOC payments in one household budget sheet.
- Include both in debt to income before applying for new credit.
- Ask how long the draw period lasts and what minimums apply.
- Confirm whether interest is calculated daily on the drawn balance.
HELOC funds can be useful for renovations that raise home function, but payment math should stay honest. Use the HELOC calculator to translate a draw into a concrete monthly obligation, then decide whether the project still makes sense beside your first mortgage.
HELOC versus cash out refinance
A cash out refinance replaces the first mortgage and may close the HELOC opportunity into a single payment. A HELOC keeps the first mortgage and adds a second lien payment on draws. Use this calculator for the second lien amortizing view, and use a mortgage payment tool for the first lien. Add both when you judge affordability.
Closing costs differ a lot between a line of credit setup and a full refinance. Fee drag can erase a small rate win.
Practical review steps
Before you rely on the result, recheck each input against a source document such as a statement, quote, or measurement note. Run one optimistic case and one cautious case so you see how sensitive the answer is. Save the inputs beside the output so you can explain the estimate later without guessing what you typed.
If a related Multicalify tool answers a neighboring question better, open that tool rather than forcing this page to do the wrong job. Clear tool boundaries keep results easier to trust and easier to explain to someone else who was not present when you calculated.
Limitations
Tax deductibility, lien position, and lender floors are not modeled. Use the estimate for cash planning, then read the HELOC agreement.