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English Club : Learn English : Vocabulary
Vocabulary : Idioms : O : off the top of your head

off the top of your head Informal

Meaning: If you give someone information off the top of your head, you do so from memory, without checking beforehand.

For example:

  • I can't tell you Maxine's phone number off the top of my head. I'll have to check.

  • I don't know for sure, but off the top of my head I'd say that renting a two-bedroom apartment would cost about a thousand dollars a week.

Quick Quiz:

The one thing that everyone can tell you off the top of their head is
  1. their name
  2. their time of birth
  3. their blood type