off the top of my head

without thinking carefully or checking

In Spanish

without thinking carefully or checking

Examples

Off the top of my head, I'd say we have around fifty customers.
Off the top of my head, I can't remember his last name.
She gave an answer off the top of her head during the interview.

When it's used

This idiom is used in informal situations when someone gives an immediate answer without much thought. It is common in casual conversation, especially when emphasizing that the information may not be entirely accurate.

The common mistake

A common mistake is saying 'out of the top of my head', which is not English. The correct phrase is 'off the top of my head'.

Related idioms

back to square one
back to the starting point after a failed attempt
to make a long story short
to summarise quickly
out of the blue
unexpectedly, without warning
by the way
incidentally, in addition

FROM WHAT YOU READ TO WHAT YOU SAY

Recognising it isn't the same as using it

Reading an idiom and understanding it is step one. Dropping it into a conversation, at the right moment, without stopping to think, is another — and that only comes from speaking.

Practise speaking