This next is particularly useful for all travels anywhere in the world, but even more so for people from or traveling to the United States. Of the 195 countries in the world, only 3 do not use the metric system, favoring the imperial system instead.

These 3 countries are Myanmar, Liberia, and the USA. As you can imagine, this can cause some confusion for citizens of those countries when traveling to other parts of the world. Luckily, someone was kind enough to draw up this lovely cheat sheet.