"Mistake" is a wrong action due to carelessness or bad judgment; "error" is more formal and can refer to faults in systems, calculations, or processes.
Noun. An incorrect action, decision, or belief, usually due to carelessness, misunderstanding, or lack of information. Everyday, informal use.
I made a mistake and sent the email to the wrong person.
Cometi un error y envie el correo a la persona equivocada.
It was a mistake to trust him with that secret.
Fue un error confiarle ese secreto.
Everyone makes mistakes. What matters is learning from them.
Todos cometemos errores. Lo que importa es aprender de ellos.
Noun. A fault or deviation from what is correct, especially in technical, mathematical, legal, or formal contexts. More precise and formal than "mistake".
The computer program crashed due to a critical error.
El programa de computadora se bloqueo por un error critico.
There was a calculation error in the financial report.
Hubo un error de calculo en el reporte financiero.
The lab results contained an error that changed the diagnosis.
Los resultados del laboratorio contenian un error que cambio el diagnostico.
Common mistake
In everyday use, "mistake" and "error" are largely interchangeable. The real difference is register: "mistake" is more natural in conversation ("I made a mistake"), while "error" is preferred in technical, legal, or formal contexts ("margin of error", "error 404", "human error in the trial"). Saying "I made an error" is not wrong, just sounds more formal.
Trick to remember it
"Mistake" = what you say when talking to a friend. "Error" = what appears in a report, a system, or a trial. In normal conversation, "mistake" is almost always the more natural choice.
Quick rule
Mistake = everyday and informal. Error = technical or formal.
Did you know?
"Trial and error" always uses "error", never "trial and mistake". "Human error" in accident investigations always uses "error". "By mistake" (accidentally) always uses "mistake": "I deleted the file by mistake." Each word has its own fixed expressions.
Exercise 1 · Pick the right one
The software keeps crashing because of a _____ in the code.
Exercise 2 · Pick the right one
I am sorry. I called you by the wrong name. It was a _____.
Exercise 3 · Form the word
Mistake = everyday and informal. Error = technical or formal.
In everyday use, "mistake" and "error" are largely interchangeable. The real difference is register: "mistake" is more natural in conversation ("I made a mistake"), while "error" is preferred in technical, legal, or formal contexts ("margin of error", "error 404", "human error in the trial"). Saying "I made an error" is not wrong, just sounds more formal.
"Mistake" = what you say when talking to a friend. "Error" = what appears in a report, a system, or a trial. In normal conversation, "mistake" is almost always the more natural choice.
Bryan López
Founder of SpeakUP Academy