This is the 2762nd most frequent Catalan word.
calen
"Calen" means "are needed" or "are necessary" in English.
In this sentence, "calen" is used impersonally to indicate the necessity for an action. It is derived from the verb "caldre."
Calen fer moltes proves abans de concloure.
It is necessary to conduct many tests before concluding.
Here, "calen" indicates a required item or resource for a particular purpose, and is conjugated to match the plural subject "cadires."
Calen més cadires per a tots els convidats.
More chairs are needed for all the guests.
In this case, "calen" describes the necessity for specific objects to achieve a goal, referring to "eines."