Formula
Active members / Total community members x 100
How to measure
Divide the count of members who posted, replied, or reacted within the period by the total registered community membership.
Why track it
A healthy active rate distinguishes a genuinely engaged community from a large but dormant membership list that generates no real advocacy or support value.
Example
A product community with 20,000 total members finds only 1,800 are active monthly, a 9% active member rate worth investigating.