Peru covers 1,296,279 km² km² on the new Equal Earth world map — 1.0%% of all land on Earth, making it the 20th largest country in the world and the 3rd largest in South America. At 9° latitude Mercator only inflates Peru by about 3%%, so the old and new maps largely agree on it — unlike the far north, where Mercator's stretch is dramatic.
For scale: Peru is roughly the same size as Chad (1,270,927 km² km²).
You could fit 3 of Paraguay inside Peru.