How do you say calm down in Spanish?… Cálmate.
That’s the exact translation from English to Spanish if that’s all you were looking for.
However, if you’ve been studying Spanish for a while now then you probably know that native speakers use way more than English equivalents to express ideas.
If you are thinking about traveling or maybe if you have Spanish-speaking friends, you must know those other ways to say “cálmante”.
After all, everyone has periods in which we lose our cool and we need someone else to tell us to chill out.
Will you need someone telling you to calm down or are you going to say that to somebody else?
Either way, you need to know these expressions.