Single-Active-User Account Count
How many of your accounts are a single point of failure — the backlog for multi-user conversion.
What is it?
This is the count of accounts that have only one active user — the raw number behind the single-user MRR share. Each one is a single point of failure, an account whose survival depends on one person.
Where the MRR share tells you how much revenue is exposed, the count tells you how many relationships are fragile — a distinction that matters when you are prioritising which accounts to expand into multi-user.
How to calculate?
Count the accounts whose active users number exactly one in the period. As with the share, the active-user definition determines the number, so keep it consistent across your usage metrics.
Work it down deliberately: every single-user account converted to two or more active users is both an expansion opportunity and a retention save, and this count is the backlog for that work.