A home equity calculator is a useful starting point—not a lending decision. It applies a selected maximum combined loan-to-value ratio (CLTV) to the estimated property value, then subtracts the current mortgage balance.
How to calculate available home equity
Multiply the estimated property value by the maximum CLTV, then subtract all existing mortgage balances. For example, an $80% CLTV limit on a $500,000 home permits up to $400,000 in total liens. With a $275,000 mortgage, the illustrative capacity is $125,000.
- Property value × CLTV
- Subtract existing liens
- Result is estimated capacity
Equity is not the same as borrowing capacity
Total equity is property value minus mortgage debt. Borrowing capacity is smaller because lenders require some equity to remain in the property and may impose maximum or minimum line amounts.
Why your approved amount may differ
A lender may use an appraisal or automated valuation rather than your estimate. Credit, income, debts, state, occupancy, property type, requested line and program rules also affect the final limit.
Use a conservative scenario
Try a lower property value and CLTV to see a more cautious estimate. Remember that closing costs or required payoffs may reduce net proceeds.
Frequently asked questions
Questions homeowners ask
What CLTV should I use for a HELOC estimate?
Program limits vary. Testing 70%, 80% and 85% can show a reasonable range without assuming you qualify for the maximum.
How accurate is an online equity calculator?
It is only as accurate as the home value and mortgage balance entered. A lender's valuation and underwriting determine the actual result.
Does the calculator include a second mortgage?
Enter the combined balance of all existing property liens for a more accurate estimate.