Thailand covers 515,720 km² km² on the new Equal Earth world map — 0.4%% of all land on Earth, making it the 50th largest country in the world and the 12th largest in Asia. At 15° latitude Mercator only inflates Thailand by about 7%%, so the old and new maps largely agree on it — unlike the far north, where Mercator's stretch is dramatic.
For scale: Thailand is roughly the same size as Spain (506,178 km² km²).
You could fit 3 of Tunisia inside Thailand.