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How to see how much storage space is available on your Apple Watch
Your Apple Watch comes with eight gigabytes of on-board flash memory, but you don't get to keep the whole storage to yourself because the operating system, Apple's apps, caches and other supporting files all decrease the amount of free space available to the user.
Like with other Apple devices, your Apple Watch lets you check out how much storage space it shipped with, how much of that space is currently available to you and how much space each of the installed apps is taking up on the device.
This tutorial will teach you to check out the amount of storage space your Apple Watch has, the amount of free space available to you and storage usage on a per-app basis.