You can roughly estimate your available equity by subtracting all the debts secured by your home (i.e., your mortgage and any existing home equity loans) from your home’s estimated market value. For example, if the market value of your home is $200,000 and you owe $100,000, you have $100,000 available in home equity.

The amount of home equity you can borrow against is determined by the equity in your home as well as other factors, like your credit history.