Check your iCloud storage on iCloud.com

On iCloud.com, you can see how much iCloud storage you have and how much is available.

Go to icloud.com/storage, then sign in to your Apple Account (if necessary).
Tip: If you’re already on iCloud.com, you can also tap in the toolbar, then tap Your iCloud Storage.
Below the storage bar, you see a list of apps and features and how much iCloud storage they use.
The apps and features that use the most storage are at the top of the list.
To buy more storage, tap Get More Storage, Change iCloud Plan, or Upgrade iCloud+ Plan, then follow the onscreen instructions.
Note: You can start the purchase on iCloud.com, but you need to complete it on a supported device.
See Buy more storage with iCloud+.
To manage your storage, tap Continue on Device, then open the notification on your Apple device to go directly to iCloud Storage Settings.

You can also check your iCloud storage from your other devices. See Check your iCloud storage on any device.

Helpful?

iCloud.com User Guide for iPhone