How to Say "metric ton" in Spanish
The Spanish word for “metric ton” is “tonelada” — A2 level. This is a very common word in everyday Spanish.

Examples
El elefante africano puede pesar hasta seis toneladas.
The African elephant can weigh up to six tons.
Este camión tiene prohibido llevar más de una tonelada de carga.
This truck is prohibited from carrying more than one ton of cargo.
La fábrica produce diez toneladas de papel al día.
The factory produces ten tons of paper per day.
The 'De' Connection
Just like in English you say 'a ton OF sand', in Spanish you always need the word 'de' after 'tonelada' before the thing you are measuring.
Always Feminine
Even if the thing you are weighing is a masculine word (like 'hierro' / iron), the word 'tonelada' stays feminine. Use 'una' or 'la'.
Gender Confusion
Mistake: “El tonelada de cemento.”
Correction: La tonelada de cemento.
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