Japan covers 370,074 km² km² on the new Equal Earth world map — 0.3%% of all land on Earth, making it the 63rd largest country in the world and the 17th largest in Asia. At 38° latitude the old Mercator map inflates area by about 1.6×, so it drew Japan closer to 588,418 km² km² — a difference of roughly 59%%.
For scale: Japan is roughly the same size as Norway (384,264 km² km²).
You could fit 3 of Cuba inside Japan.