How to Say "calculate" in Spanish
The Spanish word for “calculate” is “cuente” — A1 level. This is a very common word in everyday Spanish.

Examples
Por favor, que la secretaria cuente el inventario mañana.
Please, have the secretary count the inventory tomorrow.
Cuente de uno a veinte antes de empezar.
Count from one to twenty before starting. (Formal command, Usted)
No creo que yo cuente bien bajo presión.
I don't think I count well under pressure.
Stem Change Alert
The base verb 'contar' changes its vowel from 'o' to 'ue' in many forms, like 'yo cuento' or 'él cuente.' The 'nosotros' form, 'contamos/contemos,' usually keeps the 'o'.
The 'Cuente' Form
'Cuente' is the special verb form (subjunctive) used when expressing wishes, doubts, or emotions about counting, or when giving a formal command ('You, count!').
Forgetting the Formal Command
Mistake: “Señor, cuenta el dinero.”
Correction: Señor, cuente el dinero. (Use 'cuente' when speaking formally to someone using 'Usted'.)
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