Case totals are cumulative and are as of June 1, 2020.
Resident totals are projected 2020 totals.
Japan: 16,884 cases / 126,476,461 residents = 0.000133470356 
US: 1,757,522 cases / 331,002,651 residents = 0.00548514839 
0.00548514839 / 0.000133470356  = 41.0963794 = ~41 times as many COVID patients in America than Japan, adjusted for population size