Off the top of my head
/ˌɔːf ðə ˌtɑːp əv maɪ ˈhɛd/informal, neutralUK · US · AU · IE · CA
What does “Off the top of my head” mean?
Off the top of my head means you give an answer quickly from memory without checking the facts first.
This phrase means you are answering immediately from your memory. You do not stop to check a book, search online, or calculate the exact answer.
It feels casual, honest, and helpful. You say it when someone asks a question and you want to give a quick estimate without promising that you are correct.
When do people say it?
People say this to warn listeners that their answer might not be fully accurate.
“Off the top of my head, I think about twenty people came to the party.”
Is it formal or informal?
Register: informal, neutral. It is most at home in both everyday conversation and professional writing. Most common in UK and US and AU and IE and CA.
Where does it come from?
The exact origin is not fully settled, but it became common in American English during the mid-1900s. It pictures an idea resting on top of the brain, ready to be spoken without deep thought.
Origin confidence: Reasonably documented
How do you say “Off the top of my head” in other languages?
Last reviewed 2026-09-11