How to Say "exact" in Spanish
The most common Spanish word for “exact” is “exacto” — use 'exacto' when referring to something that is precise, correct, and without error, like a time, number, or measurement..
exacto
/ek-SAHK-toh//eɡˈsa(k)to/

Examples
¿Cuál es la hora exacta?
What is the exact time?
Necesito el número exacto de personas que vienen.
I need the precise number of people coming.
La descripción que diste es exacta, no hay errores.
The description you gave is accurate (exact), there are no mistakes.
Variable Ending
As an adjective, 'exacto' must change its ending to match the noun it describes. Use '-a' for feminine words (la hora exacta) and add an '-s' for plurals (los resultados exactos).
Not matching gender
Mistake: “El respuesta exacto.”
Correction: La respuesta exacta. Remember that 'respuesta' is a feminine word, so the adjective must end in '-a'.
perfecto
/per-FEK-toh//peɾˈfekto/

Examples
Este es el lugar perfecto para unas vacaciones.
This is the perfect place for a vacation.
Tu pronunciación no es perfecta, pero se entiende muy bien.
Your pronunciation isn't perfect, but it's very easy to understand.
La película tiene un final perfecto.
The movie has a perfect ending.
Making it Match
Like most Spanish describing words, 'perfecto' changes to match the person or thing it describes. Use 'perfecto' for masculine things, 'perfecta' for feminine things, 'perfectos' for masculine plural, and 'perfectas' for feminine plural. (e.g., un día perfecto, una noche perfecta).
Describing a Thing vs. an Action
Mistake: “El equipo jugó perfecto.”
Correction: El equipo jugó perfectamente. (The team played perfectly.) Use 'perfecto' to describe the team (a thing), but 'perfectamente' to describe *how* they played (an action).
preciso
preh-SEE-soh/pɾeˈθiso/

Examples
Necesito la hora precisa de tu llegada.
I need the precise time of your arrival.
El carpintero hizo un corte muy preciso.
The carpenter made a very precise cut.
Su descripción del evento fue precisa y detallada.
His description of the event was accurate and detailed.
Gender Agreement
Like most Spanish adjectives, 'preciso' must match the noun it describes in gender (preciso/precisa) and number (precisos/precisas).
específico
Examples
Necesito una respuesta específica antes de mañana.
I need a specific answer before tomorrow.
justo
/HOOS-toh//ˈxusto/

Examples
El profesor es muy justo con todos los estudiantes.
The teacher is very fair with all the students.
Necesito la cantidad justa de azúcar para la receta.
I need the exact amount of sugar for the recipe.
Estos pantalones me quedan un poco justos.
These pants are a bit tight on me.
Making it Match: Gender and Number
When 'justo' is used to describe something (as an adjective), it needs to match the thing it's describing. It changes its ending: justo (for masculine things), justa (for feminine things), justos (for masculine plural), and justas (for feminine plural).
Using 'justo' for 'only'
Mistake: “Quiero justo un café.”
Correction: Quiero solo un café. (I only want one coffee.) Use 'solo' or 'solamente' when you mean 'only' or 'just' in the sense of quantity.
Exacto vs. Preciso vs. Específico
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