How to Say "to convert" in Spanish
The most common Spanish word for “to convert” is “convertir” — use 'convertir' when you are changing something from one form, function, or currency to another..
convertir
/kohn-vehr-teer//kom.beɾˈtiɾ/

Examples
Necesitas convertir los euros a dólares antes del viaje.
You need to convert the euros to dollars before the trip.
Necesitas **convertir** los euros a dólares antes del viaje.
You need to **convert** the euros to dollars before the trip.
El mago prometió **convertir** el agua en vino.
The magician promised to **convert** the water into wine.
Vamos a **convertir** esta habitación vieja en una oficina.
We are going to **convert** this old room into an office.
Stem Change (e > ie)
In the present tense, the 'e' in the stem changes to 'ie' (e.g., convierto, conviertes) in all forms except for nosotros and vosotros.
Using 'en'
When you change something into something else, Spanish requires the preposition en (e.g., convertir X en Y).
Preterite Change
Mistake: “Él convertió (incorrect stem)”
Correction: Él convirtió. Remember that the third-person forms of the past tense also change the 'e' to an 'i' (convirtió, convirtieron).
convertirse
/con-ver-TIR-se//kom.beɾˈtiɾ.se/

Examples
Después de muchos años de estudio, la mujer se convirtió al budismo.
After many years of study, the woman converted to Buddhism.
Es difícil convencerlo de que se convierta a nuestra causa.
It is difficult to convince him to convert to our cause.
Using 'a' for Beliefs
When referring to changing a religion or belief system, 'convertirse' often uses the preposition 'a' (to) instead of 'en' (into): 'Se convirtió al islam.'
Mixing Prepositions
Mistake: “Se convirtió en catolicismo.”
Correction: Se convirtió al catolicismo. (Use 'al' (a + el) when converting to a specific faith.)
Confusing 'convertir' and 'convertirse'
Related Translations
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