How many apps do i have to delete to have 945 MB space on my iphone to do the update?

I need to do the update and i need to know how many apps i would need to delete to be able to do it.

Yikes.umm well it depends on the app just go through the apps you haven't opened in the past few weeks bigger games such as grand theft auto and such will take up more space than smaller apps such as flashlights