Calculating percentages, market shares, and dynamic baseline comparisons in Power BI requires overriding default report slicer filters. In Data Analysis Expressions (DAX), filter context rules dictate how calculations respond when report consumers interact with visual slicers.
Therefore, controlling filter removal is essential for accurate ratio calculations. This detailed guide explains ALL vs ALLSELECTED in DAX and clarifies how context removal works.
Understanding Filter Context in DAX Calculations
Before comparing specific functions, understanding how filter context operates during visual evaluation is critical.
Whenever a user selects a visual slicer, Power BI filters the underlying data model automatically before evaluating DAX measures.
Consequently, calculating a product’s percentage contribution against grand totals requires a measure that ignores user slicer filters explicitly.
What Is the ALL Function in DAX?
The ALL() function acts as a complete filter remover across specified tables or columns in your data model.
When wrapped inside CALCULATE(), ALL() clears every single filter applied to the referenced table, regardless of user slicers.
For example, Grand Total Sales = CALCULATE(SUM(Sales[Amount]), ALL(Sales)) computes total revenue across all products, regions, and dates continuously.
What Is the ALLSELECTED Function in DAX?
The ALLSELECTED() function restores the explicit filter context generated by user slicers while ignoring visual row or column groupings.
Unlike ALL(), ALLSELECTED() respects external report slicers while clearing internal visual grid context.
For instance, if a user filters a report page by the year 2026, ALLSELECTED() keeps the 2026 filter active while clearing individual row-level product filters inside a matrix.
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Comparing ALL and ALLSELECTED in Percentage Ratios
Selecting between ALL() and ALLSELECTED() depends on the exact denominator required for your percentage calculation.
Use ALL() when calculating global percentage shares that must remain constant regardless of any page-level slicers.
Conversely, use ALLSELECTED() when calculating dynamic visual shares that adjust automatically based on user slicer selections.
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Final Thoughts
Understanding ALL vs ALLSELECTED in DAX grants complete control over calculation context removal across your Power BI reports. By choosing ALL() for static global totals and ALLSELECTED() for dynamic slicer-aware baselines, you deliver precise percentage metrics across every executive dashboard.