Formula
Users above the power-user usage threshold / Total active users x 100
How to measure
Define a usage threshold, like a minimum number of core actions per week, and divide users above it by total active users.
Why track it
A growing power user ratio suggests the product is deepening its value for its most engaged segment, often the group most likely to expand or refer others.
Example
A tool finds 12% of active users qualify as power users, and that segment drives 60% of referrals.