[Mick]

Best estimates I've seen are between 0.5% (if you use confirmed COVID-19 deaths) to about 1% if you use excess all-cause mortality in areas where rigorous sampling has been used to calculate the seroprevalence using a random sampling method (Spain is the best study).  Because of the strong age gradient, to a large degree IFR will be very dependent on the age distribution of the infected population.

BC

Same numbers in this WSJ article, 0.5% to 1.0% IFR.
https://www.wsj.com/articles/how-deadly-...1595323801

[Mick]

Best estimates I've seen are between 0.5% (if you use confirmed COVID-19 deaths) to about 1% if you use excess all-cause mortality in areas where rigorous sampling has been used to calculate the seroprevalence using a random sampling method (Spain is the best study).  Because of the strong age gradient, to a large degree IFR will be very dependent on the age distribution of the infected population.

BC

Same numbers in this WSJ article, 0.5% to 1.0% IFR.
https://www.wsj.com/articles/how-deadly-...1595323801