HELOC Calculator

Use the HELOC Calculator

Your results

Maximum available HELOC: $0.00
Available equity: $0.00
Interest-only monthly payment: $0.00
Approval buffer or shortfall: $0.00

How this calculator works

What it does: Estimate your available home equity line of credit, interest-only payment, and whether a requested HELOC fits within a target combined loan-to-value ratio.
Inputs used: The estimate uses home value, current mortgage balance, maximum combined loan-to-value ratio (%), heloc amount requested, annual interest rate (%), and draw period interest-only years.
Calculation approach: The calculator applies the relationships defined for the heloc calculator to those inputs and updates maximum available heloc, available equity, interest-only monthly payment, and approval buffer or shortfall.
How to read the result: Treat the result as a scenario based on the values entered. Compare a few reasonable inputs and consider costs, taxes, timing, or risks that the calculator does not include.

How to Use This Calculator

Enter Home value and Current mortgage balance using values that match the scenario you want to evaluate.
Enter Maximum combined loan-to-value ratio (%) and HELOC amount requested using values that match the scenario you want to evaluate.
Enter Annual interest rate (%) and Draw period interest-only years using values that match the scenario you want to evaluate.
Review the assumptions for the heloc calculator, especially rates, time periods, and optional amounts.
Select Calculate to update the results, then adjust one input at a time to compare scenarios.

Understanding the Results

Maximum available HELOC: The maximum available heloc estimated by the HELOC Calculator using home value, current mortgage balance, and maximum combined loan-to-value ratio (%) and the other values entered.
Available equity: The available equity estimated by the HELOC Calculator using home value, current mortgage balance, and maximum combined loan-to-value ratio (%) and the other values entered.
Interest-only monthly payment: The estimated payment or withdrawal amount produced by the current balance, rate, and time assumptions.
Approval buffer or shortfall: The difference between the current position and the calculated target or comparison value.

Common Mistakes

Entering an annual interest rate as a monthly rate, or leaving out fees and required payments.
Assuming the quoted monthly payment includes taxes, insurance, or other costs when it may cover principal and interest only.
Ignoring whether a payment is high enough to cover the interest added each month.
Comparing payments without also comparing payoff time and total cost.

Worked Example

Example inputs

Home value: $500,000
Current mortgage balance: $300,000
Maximum combined loan-to-value ratio (%): 85%
HELOC amount requested: $75,000
Annual interest rate (%): 8.5%
Draw period interest-only years: 10

Example results

Maximum available HELOC: $125,000.00
Available equity: $200,000.00
Interest-only monthly payment: $531.25
Approval buffer or shortfall: $50,000.00

For this illustrative scenario, the maximum available heloc is $125,000.00. Changing any input can materially change the result, so use the example as a walkthrough rather than a guarantee.

Frequently asked questions

How much HELOC might I qualify for?

This calculator applies your maximum combined loan-to-value ratio to the home value, then subtracts the current mortgage balance. Lenders also consider income, credit, debts, property type, and underwriting rules.

What is combined loan-to-value ratio?

Combined loan-to-value, or CLTV, compares all loans secured by the home with its value. It includes the first mortgage plus the proposed HELOC limit.

How is the interest-only HELOC payment estimated?

The estimate multiplies the requested HELOC amount by the annual interest rate and divides by 12. Actual payments can change because most HELOC rates are variable and interest is charged on the amount drawn.

What happens after the HELOC draw period?

After the draw period, borrowing usually stops and principal repayment begins. The monthly payment can rise significantly depending on the remaining balance, rate, and repayment term.

Does available home equity equal available borrowing?

No. Total equity is home value minus the mortgage balance, while borrowing is usually limited by the lender’s maximum CLTV and other qualification requirements.

What does the HELOC Calculator calculate?

Estimate your available home equity line of credit, interest-only payment, and whether a requested HELOC fits within a target combined loan-to-value ratio. The result is based only on the inputs and assumptions shown on the page.

How should I interpret the maximum available heloc from the HELOC Calculator?

Use it as an estimate for the scenario entered, not as a guarantee or personal recommendation. Test changes to home value, current mortgage balance, and maximum combined loan-to-value ratio (%) to see which assumptions have the greatest effect.