DAX Active Customers (Last 90 Days) Measure

Counts distinct customers who made at least one purchase in the trailing 90 days.

Customers and RetentionIntermediateactive customerstrailingengagement

DAX code

Active Customers (Last 90 Days) =
VAR LastDate = MAX('Date'[Date])
RETURN
    CALCULATE(
        DISTINCTCOUNT('Sales'[CustomerID]),
        DATESINPERIOD('Date'[Date], LastDate, -90, DAY),
        ALL('Date')
    )

Notes

ALL('Date') anchors the 90-day window to the last loaded date rather than whatever date filter is active.

Requirements

A marked Date table and a customer ID column.

How to use this measure

In Power BI Desktop, select the table that should hold the measure and choose New measure on the ribbon.
Paste the code, then replace the placeholder table and column names with your own. The My table names fields above do this for you.
Run it through the DAX Formatter if you want it laid out in your team's style.

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More DAX resources

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