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HELOC Calculator
Estimate available credit line, draw-period payment, repayment-period payment, CLTV, and long-run interest cost for a home equity line of credit.
Home Equity Line of Credit (HELOC) Calculator
Use this free HELOC calculator to estimate available credit, draw-period payment, repayment-period payment, combined loan-to-value, and long-run interest cost for a home equity line of credit. Enter the home value, current mortgage balance, CLTV limit, rate, draw amount, and payment style to compare interest-only versus principal-and-interest behavior. It works well with the Mortgage Calculator, the Real Estate Calculator, and the broader Financial Calculators category.
Property Equity and Credit Line
HELOC Terms
Results
heloc viewThis HELOC starts with a lighter draw payment but a larger reset later
The draw-period payment is about $618.75 per month, but the repayment-period payment rises to about $639.05 once amortization begins.
Credit Line Summary
Estimated Maximum Credit Line$182,500.00
Requested Draw Amount$90,000.00
Remaining Availability$92,500.00
Combined Loan-to-Value68.18%
Interest Rate Assumption8.25%
Draw Payment StyleInterest-only
Payment and Cost View
Draw-Period Payment$618.75
Repayment-Period Payment$639.05
Balance at Repayment Start$75,000.00
Interest During Draw$68,114.08
Interest During Repayment$50,287.62
Interest Saved with Extra Pay$49,894.20
Months Saved76 months
HELOC payment timeline
Month-by-month view of the draw period and repayment period, including payment mix, interest cost, and remaining balance.
Page 1 of 24
| Month | Phase | Payment | Principal | Interest | Balance |
|---|---|---|---|---|---|
| 1 | Draw | $743.75 | $125.00 | $618.75 | $89,875.00 |
| 2 | Draw | $742.89 | $125.00 | $617.89 | $89,750.00 |
| 3 | Draw | $742.03 | $125.00 | $617.03 | $89,625.00 |
| 4 | Draw | $741.17 | $125.00 | $616.17 | $89,500.00 |
| 5 | Draw | $740.31 | $125.00 | $615.31 | $89,375.00 |
| 6 | Draw | $739.45 | $125.00 | $614.45 | $89,250.00 |
| 7 | Draw | $738.59 | $125.00 | $613.59 | $89,125.00 |
| 8 | Draw | $737.73 | $125.00 | $612.73 | $89,000.00 |
| 9 | Draw | $736.88 | $125.00 | $611.88 | $88,875.00 |
| 10 | Draw | $736.02 | $125.00 | $611.02 | $88,750.00 |
| 11 | Draw | $735.16 | $125.00 | $610.16 | $88,625.00 |
| 12 | Draw | $734.30 | $125.00 | $609.30 | $88,500.00 |
What is a HELOC calculator?
A HELOC calculator is a home-equity planning tool that estimates how much borrowing capacity a homeowner may have under a lender's CLTV limit, then models what the payment structure could look like during the draw period and after the repayment period begins.
That makes it useful for renovation planning, liquidity analysis, debt restructuring, or investment-property support decisions where timing and payment flexibility matter. To compare the line of credit with first-lien payment scenarios, continue into the Mortgage Calculator, the APR Calculator, or browse more Financial Calculators.
How this calculator works
The calculator first estimates an available line by applying the CLTV cap to the home's value and subtracting the current mortgage balance. It then tests your requested draw amount against that estimated ceiling.
Next, it models the balance through the draw period and the repayment period using a fixed-rate assumption. You can choose interest-only behavior during the draw period or begin paying principal earlier, then compare the effect of optional extra payments on total interest and payoff time.
Worked example
The default example assumes a home worth $550,000.00 with an existing mortgage balance of $285,000.00, an 85.0% CLTV cap, and a HELOC draw of $90,000.00. This setup shows how an interest-only draw period can keep the early payment lower while leaving more balance to amortize later.
Available line
$182,500.00
Draw payment
$618.75
Repayment payment
$639.05
In this example, the payment reset matters more than the opening draw payment. That is the core reason many borrowers use a HELOC calculator before they rely on home equity for renovations, reserves, or flexible borrowing.
Frequently asked questions
A HELOC calculator estimates how much equity may be available to borrow, what the draw-period payment may look like, what the repayment-period payment can become, and how much interest you may pay across the life of the line if the balance remains outstanding.
Related tools
Use these related tools to compare secured borrowing structures, housing affordability, and property-level financing decisions from other angles.
Explore This Tool in Context
HELOC Calculator is part of the Financial Calculators collection. If you want a broader view of similar workflows, open the Financial Calculators category page or browse all QuickTools categories.
Common next steps after this tool include Estate Tax Calculator, Social Security Calculator and Annuity Payout Calculator.
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