The total number of your subscribers is calculated by taking into account only your active unique subscribers. Subscribers who are bounced, archived or unsubscribed are not counted in your total subscribers. Also, if the same email address exists in more than one of your email lists, it is only counted once.
To find the total number of subscribers in your account:
- In the top navigation bar, click
and click Billing. 
- In Overview, check your unique active subscribers, as well as the total subscribers that you are allowed to have according to your Plan.
If any recent changes have been made, it will affect the calculation of your unique active subscribers' number (e.g. you just imported members to your email list). Therefore, it might take 5-10 minutes for this number to be updated.