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How to write measures in DAX

DAX (Data Analysis Expressions) is a formula language used in Power BI, Power Pivot, and other Microsoft tools to create calculated columns and measures. Here are the basic steps for writing a DAX formula:

  1. Start with an equal sign (=): All DAX formulas start with an equal sign, which indicates that a calculation will follow.
  2. Choose a function: DAX includes a wide range of functions that can be used to perform various calculations, such as SUM, AVERAGE, and COUNT. Select the function that best suits your needs.
  3. Specify the arguments: Most DAX functions require one or more arguments, which are the values or cells that the function will operate on. Enclose each argument in parentheses and separate multiple arguments with a comma.
  4. Use operators: DAX includes a variety of operators, such as +, -, *, and /, that can be used to combine functions and arguments to create more complex formulas.
  5. End with a semicolon: All DAX formulas must end with a semicolon, which indicates that the formula is complete.

Here is an example of a simple DAX formula that calculates the total sales for a given year:

=SUM(Sales[SalesAmount]);

In this formula, SUM is the function, and Sales[SalesAmount] is the argument. This formula will add up all the values in the SalesAmount column of the Sales table.

Overall, writing DAX formulas is a useful skill for working with data in Power BI and other Microsoft tools. It can take some practice to become proficient, but with time and experience, you can learn to write powerful and effective DAX formulas.


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