HELOC Payment Calculator — Monthly Payment & Interest-Only Draw Period
HELOC repayment calculator: draw-period interest-only vs amortizing payment cliff. Model US equity lines privately. Try free—no signup.
Last updated 2026-05-28 · Davi Baptista
Read also: Full calculator guide, HELOC draw period & repayment guide, Mortgage refinance calculator, Mortgage payment calculator, Mortgage affordability calculator
How it works
A HELOC payment calculator estimates interest-only payments during the draw period and principal-plus-interest payments after—rates are usually variable on home equity lines.
Use this HELOC payment calculator and HELOC monthly payment calculator to estimate draw-period and repayment-phase costs on a home equity line of credit. A home equity line payment calculator helps you compare interest-only payments against full amortization when the draw period ends. Enter drawn balance, rate, draw years, and repayment term—model HELOC calculator payment scenarios before tapping equity. Outputs are educational; lender margins, fees, and rate caps vary.
HELOC vs cash-out refinance: which fits?
A HELOC is revolving credit: you draw when needed and pay interest on the balance during a draw period, often with interest-only payments. A cash-out refinance replaces your first mortgage with a new, larger loan and gives you lump-sum cash at closing.
A home equity loan is a fixed installment on a lump sum—predictable payments but no re-borrow flexibility. Choose HELOC for phased projects; choose a home equity loan or cash-out refi when you want one defined amount and fixed payments.
Variable-rate HELOCs reset when the index moves—model +1–2% rate stress before maxing your line. Payment often jumps when the draw period ends and full amortization begins.
Choose a HELOC when you need flexible access to equity and can handle a variable rate and payment cliff after the draw period. Run both scenarios here, read our HELOC guide, and use the refinance calculator if you are weighing a full mortgage replacement.
Guide, examples, and methodology
HELOC payment calculator
A HELOC payment calculator splits your obligation into two phases: interest-only payments while you draw on the line, then fully amortizing payments after the draw period ends. Enter the balance you have actually drawn—not the full credit limit—plus APR, draw years, and repayment term to see both monthly figures and total interest.
HELOC monthly payment calculator
Monthly cost during the draw period is usually interest only: drawn balance × (APR ÷ 12). When repayment starts, principal amortizes over the remaining term and the bill can jump even if rates stay flat. Model both numbers before you budget a renovation or debt consolidation.
Home equity line payment calculator
Variable-rate HELOCs track an index plus margin—stress-test +1–2% on today's quote. Compare against a fixed home equity loan or cash-out refinance if you need one lump sum with predictable payments. Read our HELOC draw period guide for a longer walkthrough.
How to use this HELOC payment calculator
Enter the amount you have drawn (not the full credit line limit), your annual HELOC rate, draw period years, and repayment term. During the draw period most US lenders quote interest-only payments: monthly interest ≈ drawn balance × (rate ÷ 12). After the draw ends, principal amortizes over the repayment term—often 10–20 years.
Example (USD)
| Phase | Balance | Rate | Monthly payment |
|---|---|---|---|
| Draw (interest-only) | $60,000 | 8.75% | ~$438 |
| Repayment (15 yr amort) | $60,000 | 8.75% | ~$599 |
| Payment jump | — | — | +$161 after draw ends |
HELOC vs cash-out refinance
Use a HELOC when you need flexible, phased access to equity and can handle a variable rate plus a payment cliff. Use cash-out refinance when you want one fixed first mortgage and a lump sum at closing. Run both: model draw and repayment here, then compare break-even on our refinance savings calculator.
Common mistakes
- Using the full credit line limit instead of the drawn balance for payment math.
- Ignoring the repayment cliff when budgeting only the interest-only draw payment.
- Assuming today's variable rate stays flat through the draw period.
- Tapping equity for consumption without a principal repayment plan.
Draw period vs repayment period
Most US HELOCs split life into two phases. During the draw period—often 10 years—you can borrow, repay, and re-borrow up to your limit while making interest-only payments on the balance you actually owe. When the draw ends, you can no longer take new advances and must amortize the outstanding balance over the repayment term. That transition is the payment cliff: the same balance can jump from interest-only to principal plus interest overnight.
Variable rates and index margins
HELOC rates usually track a benchmark such as the prime rate plus a lender margin. When the Fed raises or cuts rates, your payment can move even if you draw nothing new. Stress-test +2% on your quoted rate before you budget a renovation or debt consolidation. Fixed-rate HELOC options exist at some banks but often carry higher starting APRs—compare total cost over your expected draw horizon, not just today's teaser quote.
When a HELOC fits US homeowners
HELOCs work well for phased projects (kitchen in year one, roof in year three), bridge financing before a home sale, or disciplined debt consolidation when you have a clear payoff plan. They fit less well when you need a large lump sum at closing with rate certainty—in that case compare cash-out refinance. Pair this calculator with mortgage affordability if the HELOC payment will stack on top of your first mortgage DTI.
Related calculators in this topic
- Mortgage Affordability Calculator
- Loan Amortization Calculator
- Rent vs Buy Calculator
- Best Refinance Calculator
Frequently asked questions
What is the difference between Home Equity Loan and HELOC?
A Home Equity Loan deposits a single lump-sum upfront at fixed Interest rates. A HELOC operates like a credit card: you have a maximum line, pay variable interest only on the exact outstanding balance, and draw funds as needed.
Can HELOC rates change during repayment?
Yes, HELOCs almost universally use variable index interest formulas (e.g. Prime rate index + margin) meaning your monthly payments can scale up or down based on central bank rates.
HELOC vs home equity loan?
HELOC = flexible draws, variable rate common. Home equity loan = lump sum, fixed rate. HELOC suits ongoing projects; loan suits one-time cost.
What happens when HELOC draw period ends?
You usually must repay principal — payment jumps from interest-only to amortizing. Plan before the cliff.
How is HELOC interest calculated monthly?
Most HELOCs charge interest on the average daily balance: (rate ÷ 12) × balance. During the draw period you often pay interest only on what you borrowed.
What LTV do lenders allow on a HELOC?
Many US lenders cap combined mortgage + HELOC around 80–85% of appraised home value. Equity and credit score still matter.
How do I calculate HELOC monthly payment?
Interest-only draw payment ≈ balance × (annual rate ÷ 12). Amortizing repayment uses loan payment math on the remaining balance and years left — use both phases in this calculator.
What is a HELOC interest-only payment calculator?
During the draw period many HELOCs bill interest only on the amount drawn. Enter drawn balance, rate, and draw years to see monthly interest cost before principal repayment starts.
Home equity line of credit payment calculator — what inputs matter?
Drawn amount, rate (prime + margin), draw period length, and repayment term drive the payment. Optional: compare interest-only vs amortizing after draw ends.