Tracking net worth
Net worth is everything you own minus everything you owe. The number on any one day matters less than its direction. Update it every few months and watch the trend.
Use realistic values. A home is worth what it would sell for after agent fees, and a car is worth its private-sale price, not what you paid for it. Retirement accounts count at full value here, but you will owe income tax on traditional 401(k) and IRA money when you withdraw it.
Reading the ratio
The debt-to-asset ratio shows how much of what you own is financed. Early in a mortgage it may be above 70%. Over time it should drift down as you pay off loans and your savings grow.