Weekly Active Users
BeginnerWeekly active users, or WAU, is the count of distinct users who performed a qualifying action at least once within a seven-day window.
Two decisions produce the WAU number: what counts as active, and the shape of the seven-day window. Active can mean opening the site or completing a core action, and the stricter the definition, the smaller and more meaningful the number. The window is either rolling, the seven days ending today and recomputed daily, or a fixed calendar week; tools do not share a default, so comparing two reports without aligning the window is invalid. The standing trap is that WAU is a de-duplicated count, so four weekly figures never add up to the monthly one and WAU is never seven times DAU.
How it is calculated
Weekly active users = count of distinct users with at least one qualifying action in a seven-day window
There is no denominator; the output is a count, not a rate, and the unit is distinct users. The qualifying action must be defined before the calculation and held stable, and each user is counted once in the window no matter how often they return. When identity rests on a browser cookie, one person on two devices counts as two users.
FAQ
Sources:Wikipedia — Active users