HELOC Payment Calculator — Estimate Draw & Repayment Costs

Estimate Your Monthly Payments

HELOC Balance

Amount drawn or owed on your credit line

Interest Rate

Most HELOCs use a variable rate

Draw Period

yrs

Typically 10 years

Repayment Period

yrs

Typically 15–20 years

Most HELOCs carry a variable interest rate tied to the U.S. prime rate, meaning your payment can rise or fall over time. Check the current average via Freddie Mac's published rates before entering your figure.

Draw Period Payment

Interest-only, per month

Repayment Period Payment

Principal + interest, per month

Lifetime Cost Summary

Phase	Monthly Payment	Total Paid
Draw Period (interest-only)	$0	$0
Repayment Period	$0	$0
Total Over Life of HELOC	—	$0

What this means

During the draw period you only pay interest on what you've borrowed, so payments are lower. Once repayment begins, you'll pay both principal and interest — expect your monthly payment to rise.

How HELOC Payments Work

A HELOC (Home Equity Line of Credit) has two distinct phases, and your payment changes significantly between them. Understanding this structure is the single most important thing to get right before taking one out.

The Draw Period

This is typically the first 10 years of your HELOC. You can borrow, repay, and borrow again up to your credit limit — much like a credit card. During this phase, most lenders only require interest-only payments on whatever balance you've drawn. This keeps payments low, but your principal balance doesn't reduce unless you choose to pay more.

The Repayment Period

Once the draw period ends, you can no longer borrow against the line. Instead, you enter a repayment period — typically 15 to 20 years — where you pay back both principal and interest, similar to a standard mortgage. This is where many homeowners are caught off guard: the jump from interest-only to full amortizing payments can mean your monthly payment increases substantially.

Common pitfall

Many homeowners budget for the draw period payment and don't plan for the increase when repayment begins. Always calculate both figures before borrowing — that's exactly what the tool above does.

Why Your Rate Matters So Much

Because HELOC rates are usually variable, the interest rate you enter today may not be the rate you pay in year three or year eight. The rate moves with the U.S. prime rate, which is influenced by Federal Reserve policy decisions. A rate rise of even 1–2% can meaningfully change your monthly payment, particularly during the repayment period when principal is included.

If you want to stress-test your numbers against a rate increase, try our Variable Rate Impact Calculator next.

What This Calculator Doesn't Include

This tool estimates principal and interest only. It does not include lender fees, annual maintenance charges, appraisal costs, or closing costs, which vary by lender. Always request a full Loan Estimate from your lender for an exact figure.

HELOC Payment FAQs

Usually not. Most HELOCs only require interest-only payments during the draw period. However, you can choose to pay down principal voluntarily, which reduces your balance and lowers what you'll owe once repayment begins.

Because you switch from interest-only payments to full amortizing payments that include both principal and interest. If you only made minimum payments during the draw period, the jump can be significant — sometimes doubling or more.

Yes. Many homeowners refinance into a new HELOC, convert to a fixed-rate home equity loan, or roll the balance into a cash-out refinance before repayment begins, particularly if rates have changed or the new payment isn't affordable.