I’ve never used iCloud Photos before, so I’m a bit nervous. Currently, I have an iPhone 12 Pro Max with 256 GB of storage on iOS 18.1, an iPad Pro 11 m4 with 512 GB of storage on iPad os 18.1, and a 2017 iMac with 1 TB of storage on macOS Ventura 13.7.1.

I’ve already uploaded my phone’s photo library to iCloud (my iPhone’s library was 106.76 GB, and my free space was 68.35 GB. After uploading, my library size was 8.36 GB, and I freed up 152.45 GB). On my iPad, I have a photo library of 91.46 GB, and my free space is 345.64 GB. After iCloud syncing, the size of my photo library is still unknown.

On my iMac, I have a photo library of 500 GB. If I enable iCloud on my Mac, how much free space would I have? Additionally, will it build up space on my iPhone and iPad, and howmuch?