HELOC Calculator

Estimate payments during an interest-only draw period and the later repayment period.

Draw-period interest payment

$375

Utilization 50.0%

Total drawn$50,000

Available credit$50,000

Draw-period interest and fees$46,250

Repayment payment$450

Repayment interest$57,967

Total estimated cost$104,217

Assumes a constant variable rate, interest-only draw period, no new draws or principal payments, then full amortization. Actual HELOC terms vary.

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Planning guide

Read the complete guide →

Understand this estimate before using it

Quick answer

What does the HELOC Calculator do?

Estimate draw-period interest, repayment payments, fees, and available credit. It models draw-period interest and repayment-period amortization from balance, rate, term, fees, and available credit assumptions.

Formula and calculation method

It models draw-period interest and repayment-period amortization from balance, rate, term, fees, and available credit assumptions.

The result is only as reliable as the inputs. Use current balances, rates, fees, dates, and documents; then change uncertain assumptions to see whether the conclusion remains stable.

How to interpret the result

Treat the output as a comparison or planning range, not a quote, approval, eligibility decision, tax return, or prediction. Review the breakdown—not only its headline number—and read every stated exclusion.

For current background, review CFPB home-equity guidance. Product documents and official program tools control when they differ from this educational model.

Worked scenario

Put the result in context

For a $500,000 home with $300,000 of existing secured debt and an 80% combined-LTV assumption, the theoretical debt ceiling is $400,000, leaving $100,000 before product limits, fees, underwriting, and required equity cushions.

This scenario illustrates the method; it is not a quote, forecast, recommendation, or substitute for entering your actual facts.

Before you calculate

Gather current information before changing the defaults. A result based on verified records is more useful than a precise answer built from guesses.

credit limit and the amount drawn

Check the date, unit, and source of this input before entering it.

interest rate

Check the date, unit, and source of this input before entering it.

draw period and repayment period lengths

Check the date, unit, and source of this input before entering it.

annual and upfront fees

Check the date, unit, and source of this input before entering it.

What the result can answer

It can show how the entered assumptions interact, provide a consistent comparison, and reveal whether changing one important input materially changes the estimate.

What the result cannot decide

It cannot confirm approval, eligibility, market pricing, future performance, legal or tax treatment, contract quality, or whether the choice fits every part of your finances.

A practical next-step workflow

01 · Verify
Compare the inputs with current statements, quotes, official rules, and product documents.
02 · Stress-test
Run a second case with a less favorable value for annual and upfront fees.
03 · Confirm
Ask the lender for the repayment-period payment, not just the draw-period one, and confirm whether the rate can change before acting.

Frequently asked questions

What is combined loan-to-value?

CLTV divides all debt secured by the property by its value. It is a planning input, not a universal approval threshold.

Is a HELOC payment fixed?

Usually not. Draw-period payments and variable rates can change, and repayment-period payments may be materially higher.

What can make this estimate differ from an actual result?

Timing, rounding, rate changes, fees, taxes, eligibility rules, product conventions, and facts not requested by this focused calculator can all create differences.

Which inputs deserve a second scenario?

Retest any input that is quoted rather than fixed, depends on future behavior, or materially changes the result. Conservative and optimistic cases reveal more than false precision.

What should I verify before making a decision?

Verify current statements, disclosures, official rules, taxes, fees, cancellation or prepayment terms, and the consequences of a less favorable outcome.

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Prepared by Loan Lyze Editorial and reviewed under the Loan Lyze editorial framework on November 8, 2026. Educational estimate only. See our methodology, editorial policy, and corrections policy.

HELOC Calculator

Estimate HELOC draw and repayment