{"id":1835,"date":"2026-09-01T12:00:41","date_gmt":"2026-09-01T12:00:41","guid":{"rendered":"https:\/\/entri.app\/explore\/?post_type=curriculum&p=1835"},"modified":"2026-09-01T12:00:41","modified_gmt":"2026-09-01T12:00:41","slug":"dax-formulas","status":"publish","type":"curriculum","link":"https:\/\/entri.app\/explore\/power-bi\/dax-formulas\/","title":{"rendered":"DAX Formulas"},"content":{"rendered":"

What Are DAX Formulas in Power BI?<\/b><\/strong><\/h2>\n

A DAX formula is an expression built from DAX functions, operators, and Table[Column] references that defines a calculated column, calculated table, or measure. Every DAX formula starts with a name, an equals sign, and then the expression that produces the result.<\/p>\n

Where DAX Formulas Are Used<\/b><\/strong><\/h2>\n

The same DAX formula language works in Power BI Desktop (for calculated columns, tables, and measures) and in Excel’s Power Pivot add-in, since both run on the same underlying DAX engine.<\/p>\n

Filter-Based DAX Formulas<\/b><\/strong><\/h2>\n

A DAX filter formula typically wraps CALCULATE() around a base measure, adding or overriding filter conditions \u2014 for example, calculating sales only for a specific region regardless of what’s selected elsewhere on the report page.<\/p>\n

Using a Slicer Value Inside a DAX Formula<\/b><\/strong><\/h2>\n

SELECTEDVALUE() reads the single value currently selected in a slicer and returns it (or a fallback value if multiple items are selected), letting a measure or text box respond dynamically to a user’s slicer choice.<\/p>\n

Writing More Complex DAX Formulas<\/b><\/strong><\/h2>\n

Complex DAX formulas usually nest several functions together \u2014 for example, CALCULATE() wrapped around FILTER(), combined with time intelligence functions for a year-over-year comparison. Using VAR to name intermediate results makes formulas like this far easier to read and debug than nesting everything in one line.<\/p>\n

How to Write a DAX Formula in Power BI<\/b><\/strong><\/h2>\n

This tutorial walks through writing a filtered DAX formula in about 6 steps \u2014 starting from a basic SUM() measure and wrapping it in CALCULATE() to apply a specific filter condition.<\/p>\n

Prerequisites<\/b><\/strong><\/h3>\n
    \n
  • Power BI Desktop with a Sales-style table loaded<\/li>\n
  • A basic measure already created, or willingness to create one in step 1<\/li>\n<\/ul>\n

    Steps<\/b><\/strong><\/h3>\n
      \n
    • <\/b> Create a base measure: <\/b><\/strong>Total Sales = SUM(Sales[Amount]).<\/li>\n
    • <\/b> Decide what to filter: <\/b><\/strong>Identify the condition you want, e.g. only the West region.<\/li>\n
    • <\/b> Wrap the base measure in CALCULATE: <\/b><\/strong>West Sales = CALCULATE([Total Sales], Sales[Region] = “West”).<\/li>\n
    • <\/b> Test the formula: <\/b><\/strong>Add both measures to a table visual and confirm West Sales is a subset of Total Sales.<\/li>\n
    • <\/b> Add a slicer-driven version if needed: <\/b><\/strong>Use SELECTEDVALUE(Sales[Region]) inside a formula to react to whatever the user picks in a slicer.<\/li>\n
    • <\/b> Format the result: <\/b><\/strong>Set number formatting (currency, decimals) on the new measure via the Modeling ribbon.<\/li>\n<\/ul>\n

      Common Errors & Troubleshooting<\/b><\/strong><\/h3>\n
        \n
      • Filtered measure returns the same number as the unfiltered one \u2014 check that the filter condition inside CALCULATE actually matches values in the data (case and spelling matter).<\/li>\n
      • SELECTEDVALUE returns blank \u2014 this happens when multiple slicer values are selected at once; supply a second argument as a fallback label.<\/li>\n
      • Formula works in isolation but breaks inside a visual \u2014 check whether an existing page- or report-level filter is interacting unexpectedly with the formula’s own filter.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

        What Are DAX Formulas in Power BI? A DAX formula is an expression built from DAX functions, operators, and Table[Column] references that defines a calculated column, calculated table, or measure. Every DAX formula starts with a name, an equals sign, and then the expression that produces the result. Where DAX Formulas Are Used The same […]<\/p>\n","protected":false},"author":2,"featured_media":0,"template":"","meta":{"_acf_changed":false},"curriculum-category":[101,91],"custom_linking_tags":[],"class_list":["post-1835","curriculum","type-curriculum","status-publish","hentry","curriculum-category-power-bi-dax","curriculum-category-power-bi-tutorials"],"acf":[],"yoast_head":"\nDAX Formulas - Entri Free Materials<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/entri.app\/explore\/power-bi\/dax-formulas\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DAX Formulas - Entri Free Materials\" \/>\n<meta property=\"og:description\" content=\"What Are DAX Formulas in Power BI? 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