How many books can your Kindle actually store?

I’ve carried a Kindle around in my book bag since 2011. Throughout middle school, high school, college, and now my adult life, I have never been without my digital library and an abundance of fictional worlds to explore on the go. It’s probably my most beloved device, even behind my M3 MacBook Pro and iPhone 16 Pro. However, like those other two devices, Kindles come with storage limits.