There is the federal debt to GDP ratio, which is 105%. This is at least a 50-year high[0]. FRED's household debt to GDP data doesn't go back very far, but we can see it's off the highs off 2008[1]. (edit: added household debt to GDP)
You're looking for household debt to GDP [1]. It is a real (versus nominal) statistic because it's a ratio between two nominal terms. It also communicates financial health better than a per-capita term, since it measures against production.
A few other interesting angles: Household Debt Service Payments as a Percent of Disposable Personal Income[0] (10.3%, near 40-year lows), Consumer Debt Service Payments as a Percent of Disposable Personal Income[1] (5.9%, near 40-year average), Personal Saving Rate[2] (3.2%, near 50-year lows).
[0] https://fred.stlouisfed.org/series/TDSP