How to Say "i mistake" in Spanish
The Spanish word for “i mistake” is “equivoco” — A2 level.

Examples
Siempre equivoco tu número de teléfono con el de tu hermana.
I always mistake your phone number for your sister's.
Yo equivoco los nombres de las calles cuando estoy cansado.
I confuse the names of the streets when I am tired.
Reflexive Use is Key
Most of the time, Spanish speakers use the reflexive form (equivocarse) to mean 'to make a mistake.' You use 'equivoco' (non-reflexive) only when you are actively confusing two separate things.
Spelling Change in Preterite
Since equivocar ends in -car, the 'c' changes to 'qu' in some verb forms (like 'yo equivoqué') to keep the hard 'k' sound.
Saying 'I make a mistake'
Mistake: “Yo equivoco un error.”
Correction: Me equivoco. (The verb *equivocarse* already means 'to make a mistake,' so you don't need the word 'error'.)
Related Translations
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