HELOC Calculator

How this result is built

Compare the interest-only draw payment on a HELOC with the later amortizing payment.

A HELOC is easiest to underestimate during the draw period, when many lines ask only for interest. The payment looks calm. The balance does not shrink. This page puts the interest-only payment next to the payment that appears once the same balance starts to amortize.

What the opening example is for

The rate is whatever you type. Most HELOCs are variable, so rerun the numbers at a higher rate before you treat the payment as fixed.

The walkthrough below uses the numbers already sitting in HELOC Calculator. Press Calculate and the headline should match this page. Then put your own figures in. The math does not run until you press the button, and Clear hides the result.

What each field is doing

The “Credit limit” line on HELOC Calculator starts at $80,000.00. Leave that figure only when it matches the statement, the quote, or the plan you are testing. Press Calculate after the edit so the chart and the schedule move with it.

HELOC Calculator treats “Balance you expect to carry” as its own entry, and the form opens with $35,000.00. A round example is useful for learning the page. It is a poor substitute for the number on your own paperwork, so replace it and run the form again.

The remaining fields

Before you replace it, “Current rate” reads 8.75% on HELOC Calculator. The other fields stay put while you change this one. That is the clean way to see what this line is doing inside the result.

Look at “Repayment term after the draw” first if you are checking HELOC Calculator: the filled value is 15. If the label is a rate, type the annual figure the contract uses. If it is money, type the amount that will actually move, not a rounded hope.

The opening result, line by line

Press Calculate on the opening form and Interest-only draw payment is $255.21. That is the number the rest of this section is talking about.

Credit limit is $80,000.00 when you run the opening figures on HELOC Calculator. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

On this opening pass, balance used is $35,000.00. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

HELOC Calculator reports that payment when repayment amortizes is $349.81. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

How those lines were produced

Annual rate is 8.75% when you run the opening figures on HELOC Calculator. That line is part of the same calculation as the headline. It is not a second balance you can spend on top of the result. Change one input and press Calculate if you want to see whether this line moves.

A HELOC rate is usually variable. This snapshot uses the rate you enter and keeps the balance flat during the draw.

A second pass changes only “Credit limit”, from $80,000.00 to $88,000.00. Interest-only draw payment moves from $255.21 to $255.21. Nothing else on the form was edited, so the gap between those two results is the effect of that one field on HELOC Calculator. If the gap is tiny, this page is not very sensitive to that entry. If the gap is large, get that entry from a document before you plan around the result.

What this page will not claim

HELOC Calculator does not know your credit score, the county’s tax bill, or what an appraiser will say. Type the price, the loan, and the escrow you were quoted. Compare the payment with the loan estimate, and treat a small rounding difference as normal.

HELOC Calculator stops at its own formula. When the next question is different, open Home Equity Loan Calculator (A second loan, with the combined LTV beside it.); Loan-to-Value Calculator (Loan, value, and the equity in between.); Interest Calculator (A direct answer to how much interest you earn.). Do not add those results to this one as if they were the same kind of dollar.

Check the result before you use it

Start on HELOC Calculator by reading the labels, not the headline. The opening labels are Credit limit ($80,000.00), Balance you expect to carry ($35,000.00), Current rate (8.75%), Repayment term after the draw (15). If a label is not the fact you have, the result cannot turn into that fact later. The illustration on the form lands on $255.21. When you press Calculate and see that same figure, the button and this explanation are using one formula.

Change one field at a time. Write down the headline, edit a single line, and press Calculate again. A large jump means that line carries the result. A line that does not move is a line the formula ignores, which is a reason to confirm you opened the right page. HELOC Calculator is built for one job: Interest-only now, amortizing payment later. The description on the page says the same thing in a sentence: Compare the interest-only draw payment on a HELOC with the later amortizing payment.

When the paperwork disagrees

Then hold the headline next to a source outside the site. That source might be a loan estimate, an account statement, a pay stub, or the public limit named in the methodology. A few cents of difference on a long schedule is ordinary rounding. A different rate, a fee you never typed, or a tax the form does not ask for is not rounding. Correct the input. Do not average the page with the paperwork.

When the outside source still disagrees, HELOC Calculator has reached the edge of what it will claim. It will not phone a lender, pull a county record, or apply a credit you left blank. Send the calculator name, every input, and the result you expected through the contact page if you think the formula itself is wrong. Until that is settled, read $255.21 as the output of the fields above and nothing else.

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