Know the credit available today - and the payment risk tomorrow.

It multiplies the home value entered by the selected combined loan-to-value limit, then subtracts the mortgage balance and any other debt secured by the property. This is only a planning estimate; lender appraisal, credit, income, debts, property type, occupancy, and underwriting rules can change the result.

Typically, interest is based on the amount actually drawn, not the unused portion of the line. A lender may still charge annual, inactivity, early-closure, transaction, or other fees, so review the official disclosures.

The prototype assumes an interest-only minimum during the draw period, so the principal does not fall. During repayment, both principal and interest must be paid over the selected repayment term. A variable-rate increase can raise either payment.

Combined loan-to-value, or CLTV, compares the mortgage, other property-secured debt, and proposed HELOC line with the home's value. For example, $400,000 of total property debt on a $500,000 home equals 80% CLTV.

Yes. Select the existing HELOC option, enter the current credit limit, current balance, remaining draw years, rate, and repayment term. The estimate then focuses on the balance and terms already in place rather than estimating new borrowing capacity.

For a new HELOC, closing costs can be entered as dollars or as a percentage of the line. You can model paying them upfront or adding them to the starting balance. Annual fees are added to the cost summary and payment schedule.

HELOC rates are commonly variable. The stress test compares the entered rate with higher rates up to the lender maximum entered, so you can see a range of possible interest-only and repayment payments. It is not a forecast.

Yes. The advanced assumptions let you add an estimated monthly draw during the draw period and an extra monthly principal payment. Both flow through the chart, totals, and monthly or yearly payment schedule.

No. A HELOC is generally a reusable line of credit with a draw period and usually a variable rate. A home equity loan generally provides one lump sum with a set repayment schedule.

No. Results are educational estimates based only on the values entered. MortgageCalcGrid is not a lender or broker and does not provide approvals, offers, rate locks, APR disclosures, or personalized financial advice.