how much Space for ads ? in scall to fit full screen ?

i decided to use scall to fit full screen mode so  how much space in the bottom of screenI have to leave it empty ? Knowing that there is already a great vacuum in some  devices caused by the scalling ?  help pleaze

Heeelp

Are you using admob banner adverts?

No I plan to share my application soon and I think about the space I have to leave  empty for ads banner

Its been a while since i used them, but there is a block called "height of mobile ad".  I don't know if you get different hights or not, but you could draw that block to the screen and see what the read out it.