Capacity is a term that our team uses to distill a large number of factors involved in hosting applications and ensuring that they perform well. In Bubble terms, capacity is a resource that your application needs to run smoothly; if your application is maxing out its allotted capacity, it will become rate-limited, which could result in reduced performance. The capacity available to your application is determined by your plan tier.
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We don't have a capacity unit to user/workflow conversion or examples to share, since each Bubble application is highly customizable and therefore performs differently from any other Bubble app. We've seen users with about 500 daily users work with 3 units of capacity; on the other end of the spectrum, we've seen apps with more than 100,000 page views a day work quite well with 30 units. Applications with large numbers of searches and complex workflows will use more capacity than simpler, more streamlined apps. For performance best-practices, we recommend checking out these forum posts.
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You can use a free capacity boost to see if your application could benefit from additional capacity (check out this forum post for more details).
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Do also note that you can apply additional capacity units to your application on the Professional and Production plans; changes to the number of your app’s capacity units are billed on a prorated basis.