How to Say "necessary" in Spanish
The most common Spanish word for “necessary” is “necesario” — use 'necesario' for general situations where something is needed or required, without a strong sense of obligation or specific purpose.
necesario
ne-se-SA-ryoneseˈsaɾjo
Examples
Es necesario estudiar para el examen.
It's necessary to study for the exam.
El agua es necesaria para la vida.
Water is necessary for life.
No es necesario que vengas si no quieres.
It's not necessary for you to come if you don't want to.
Matching the Noun
Like most Spanish adjectives, necesario changes to match the thing it describes. Use necesario for masculine things (un libro necesario) and necesaria for feminine things (una respuesta necesaria).
Always Use 'Ser'
To say something is necessary, you'll almost always use the verb ser (Es necesario...). It's a description of a permanent state or a general truth.
Two Ways to Say What's Necessary
You can say what needs to be done in two common ways. 1) Es necesario + action: Es necesario comer. 2) Es necesario que + person + special verb form: Es necesario que comas (It's necessary that you eat).
Forgetting the Feminine Form
Mistake: “La información es necesario.”
Correction: La información es necesaria. Remember that 'información' is a feminine word, so the adjective needs to match!
Using 'por' Instead of 'para'
Mistake: “Es necesario por el trabajo.”
Correction: Es necesario para el trabajo. When you say something is necessary 'for' a purpose or a goal, you always use 'para'.
requerido
reh-keh-REE-dohrekeˈɾiðo
Examples
El pasaporte es un documento requerido para viajar al extranjero.
A passport is a required document for traveling abroad.
Complete todos los campos requeridos en el formulario.
Complete all the required fields in the form.
No cuentas con la experiencia requerida para este puesto de trabajo.
You don't have the required experience for this job position.
Match your endings
Since this is an adjective, you must change the ending to match what you are talking about: 'requerido' (male), 'requerida' (female), 'requeridos' (male plural), or 'requeridas' (female plural).
Word placement
In Spanish, this word usually comes after the person or thing it describes. For example, 'documento requerido' rather than 'requerido documento'.
Gender Mismatch
Mistake: “La firma requerido.”
Correction: La firma requerida. (Because 'firma' is a feminine word, 'requerido' must also become feminine).
obligado
oh-blee-GAH-dohoβliˈɣaðo
Examples
El uso del casco es obligatorio para los ciclistas.
Wearing a helmet is mandatory for cyclists.
Una visita al museo del Prado es una parada obligada en Madrid.
A visit to the Prado museum is a required/must-do stop in Madrid.
Si llueve, el plan B es obligado.
If it rains, Plan B is necessary.
Agreement is Key
Since 'obligado' is an adjective, make sure its ending matches the thing it describes: 'la tarea obligada' (the required task, feminine) or 'los documentos obligados' (the required documents, plural).
preciso
preh-SEE-sohpɾeˈθiso
Examples
Es preciso actuar con rapidez para evitar el problema.
It is necessary to act quickly to avoid the problem.
Si precisa más información, llámeme.
If you require more information, call me. (Formal use, derived from the verb 'precisar' but functioning as a formal adjective/expression)
Triggering the Special Verb Form
When used impersonally ('Es preciso que...'), the verb that follows must use the special subjunctive form, meaning the verb changes its ending to express necessity or desire: 'Es preciso que vengas' (It is necessary that you come).
General vs. Mandatory
Related Translations
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