off the top of your head

US /ɔf ðə tɑp əv jʊər hɛd/
UK /ɔf ðə tɑp əv jʊər hɛd/
"off the top of your head" picture
1.

a memoria, su due piedi

from memory, without careful thought or checking facts

:
I can't tell you the exact number off the top of my head, but it's around fifty.
Non posso dirti il numero esatto a memoria, ma è circa cinquanta.
Can you name three capital cities off the top of your head?
Puoi nominare tre capitali a memoria?