How the ratio is calculated
Add up total assets at their current market value: the home, cars, investments, retirement accounts, savings and anything else that could be sold. Then add up total debts: the outstanding mortgage, car loans, credit card balances, student and personal loans. The two totals are the whole of the page’s input.
Divide debts by assets and multiply by 100. A household with $350,000 of assets and $140,000 of debts is at 40%: four in ten dollars of what it owns is still financed. What is left over - assets minus debts - is the equity owned free and clear, and the ratio is really just a way of expressing that ownership stake as a percentage.