Total equity = estimated value − mortgage balance − any HELOC balance. Tappable equity = 80% of value − everything owed (floored at zero).

What data does it use?

The 80% combined-LTV convention widely published by consumer-finance references.

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Home Equity & Cash-Out: how it works

Estimates total home equity (value minus everything owed) and the portion typically available through a HELOC or cash-out refinance, using the standard 80% combined loan-to-value ceiling.

Step by step

Total equity = estimated value − mortgage balance − any HELOC balance.
Tappable equity = 80% of value − everything owed (floored at zero).

The math

Tappable = max(0, value × max LTV − balances).

Sources

The 80% combined-LTV convention widely published by consumer-finance references.