How is the number of subscribers calculated for my plan?

Right now, Facebook considers anybody who messages your page to be a subscriber.

That means the moment you set ManyChat up on your Facebook page, anybody who reaches out to your page via Messenger will be recorded as a subscriber until they explicitly opt out or delete the conversation.

Only the number of Active subscribers is calculated so you won't pay for all Deleted and Unsubscribed users!

Hope that helps.