In terms of absolute numbers, increasing mask use to 95% is estimated to avert the largest number of deaths due to COVID-19 in Pakistan (25,194 deaths), Egypt (20,930 deaths), and Bangladesh (20,344 deaths).
Predictions for the three countries with the largest death tolls due to COVID-19 to date:
The US has had over 120,000 deaths so far. By October 1, 2020, cumulative COVID-19 deaths could reach 179,106 deaths (with an estimated range of 159,497 to 213,715). In terms of the mean projection, this represents approximately 60,000 additional cumulative COVID-19 deaths between today and October 1, 2020. That number drops to 146,047 (with a range of 140,849 to 153,438) if at least 95% of people wear masks in public. In other words, if 95% of the US population always wore masks in public, more than half the deaths that are predicted between now and October 1 would be avoided