"The United States has roughly 2.8 hospital beds per 1,000 people. South Korea, which has seen success mitigating its large outbreak..."

"...has more than 12 hospital beds per 1,000 people. China, where hospitals in Hubei were quickly overrun, has 4.3 beds per 1,000 people. Italy, a developed country with a reasonably decent health system, has seen its hospitals overwhelmed and has 3.2 beds per 1,000 people."

From "This is the coronavirus math that has experts so worried: Running out of ventilators, hospital beds" (WaPo).

As for the ventilators:

In a report last month, the Center for Health Security at Johns Hopkins estimated the United States has a total of 160,000 ventilators available for patient care (with at least an additional 8,900 in the national stockpile). A planning study run by the federal government in 2005 estimated that if the United States were struck with a moderate pandemic like the 1957 influenza, the country would need more than 64,000 ventilators. If we were struck with a severe pandemic like the 1918 Spanish flu, we would need more than 740,000 ventilators — many times more than are available.

That's some background on "Healthcare system capacity" means in this now-familiar graph:

Important to remember that #Covid-19 epidemic control measures may only delay cases, not prevent. However, this helps limit surge and gives hospitals time to prepare and manage. It's the difference between finding an ICU bed & ventilator or being treated in the parking lot tent. pic.twitter.com/VOyfBcLMus

— Drew A. Harris, DPM, MPH (@drewaharris) February 28, 2020