Find iPhone App Size on the iPhone or iPod touch
Checking how much space an app takes up on an iPhone is more accurate because the actual size of an app isn’t just the app itself. Apps also require preferences, saved files, and other data. An app that takes up 10 MB when you download it from the App Store can become many times larger after you start using it. You can only tell how much space those additional files need by checking on your device. To find out how much storage space an app requires on an iPhone:
Find iPhone App Size Using iTunes
Using iTunes only tells you the size of the app itself, not all of its related files, so it’s less accurate. You can still use iTunes to get an iPhone app’s size.
Update a Full iPhone
Consistent storage problems may block you from updating your iPhone, given the space that iOS update packages require. Don’t forego the update; use special techniques to update your iPhone when it doesn’t have enough storage space to install the update.
Right-click the app, then choose Get Info.Click the app icon, then press Cmd+I on Mac or Ctrl+I on Windows.Click the app icon, then go to the File menu and choose Get Info.
