How many COVID-19 cases result in hospitalizations? In states that have tracked cumulative hospitalizations, there's a wide range, but an average of 17% of *known cases* have resulted in hospitalizations so far. However, many cases are unknown. https://covidtracking.com/data/us-daily 

The consensus has seemed to be that around 1 in 10 infections are detected in the US, in which case the true hospitalization rate would be around 1.7%. But there is much disagreement about how much undercounting there is.