CALCIDA

HELOC Calculator

Written by Calcida Team
Reviewed by Financial Review Process
Last updated: April 2026

Calculations are rooted in standard financial formulas and are provided as educational estimates only. They do not constitute professional financial advice. Results may vary based on actual interest rates and fees. You should verify all numbers with a certified financial professional prior to making significant financial commitments. Read our editorial commitment

Estimate HELOC payments during the draw period and the repayment period based on your rate and term.

Built specifically for homeowners estimating HELOC payments during draw and repayment periods, this engine analyzes Drawn balance, Interest rate, Draw period, Repayment period to output estimated draw-period payment and repayment-period payment.

Estimated HELOC Payments

Draw Period (Interest-Only)
$333
Approx. interest-only for 10 years
Repayment Period (Amortized)
$418
Amortized over 20 years
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How This Calculator Works

This calculator shows your estimated HELOC payments across both phases of the loan: the draw period (interest-only) and the repayment period (principal + interest). Because HELOCs have variable rates, the actual payment will fluctuate with the Prime Rate.

Two Phases of a HELOC

Draw Period (5–10 years)

Borrow as needed up to your credit limit. Minimum payment is typically interest-only on the outstanding balance. Your balance rises and falls as you draw and repay.

Monthly interest = Balance × (Annual Rate ÷ 12)

Repayment Period (10–20 years)

No new draws allowed. Outstanding balance is amortized over the repayment term — payment includes both principal and interest, and is significantly higher than draw-period payments.

Monthly payment = Fully amortizing payment on remaining balance

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Formula

Draw Payment ≈ Balance × (APR / 12); Repayment uses amortization over remaining term
Balance
outstanding drawn balance Description
APR
annual rate (often variable) Description

Example Calculation

Example: $75,000 HELOC at 9.25% (2026)

Draw Period (10 years, full balance drawn)

Outstanding balance$75,000
Interest rate9.25% (variable)
Interest-only payment~$578/month

Repayment Period (20 years)

Balance at start of repayment$75,000
P+I monthly payment~$688/month
Payment increase from draw period+$110/month (+19%)
Total interest paid~$90,200

*Variable rate risk: If rate rises to 11.25%, monthly draw-period payment increases to ~$703 (+$125/month).

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HELOC Best Practices: Access Equity Wisely

  • Use HELOCs for value-adding investments. Home renovations that increase your property's value, education that raises earning potential, or consolidating higher-rate debt all justify using home equity. Vacations and discretionary spending do not — you are putting your home at risk.
  • Budget for repayment-period payment shock. The switch from interest-only to P+I can significantly impact cash flow. Build repayment-period payments into your financial plan before you draw.
  • Watch the variable rate risk. HELOCs track the Prime Rate. If the Fed raises rates 2%, your rate rises 2% too. Consider a fixed-rate home equity loan if you prefer payment certainty.
  • Consider converting to a fixed-rate during repayment. Many lenders allow a rate-lock option at the start of the repayment period, converting part or all of the balance to a fixed rate.
  • Never miss a payment. A HELOC is secured by your home. Defaulting can put your house at risk of foreclosure — the stakes are fundamentally different from unsecured credit card debt.

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