Dynamic format using DAX

Just a quick blog post today. Someone had a scenario where they wanted to have a different number of decimal points based  on the items on the rows. Initially they wanted to go with a calculated column but it is much easier to do this using the FORMAT function in DAX. Using the FORMAT function you can return the numerical value any way you want it.

Let’s take the following example. I have the several different devices and I want to format them all differently. I can write a single measure that return different formatting for each device.

This would be the measure I would write:

Measure = if(HASONEVALUE(Device[DeviceName]),
SWITCH(VALUES(Device[DeviceName])
,”Aircard 1″, FORMAT([Sum of Revenue], “0.0”)
,”Aircard 2″, FORMAT([Sum of Revenue], “0.00”)
,”Aircard 3″, FORMAT([Sum of Revenue], “$0.000″)
,”Aircard 4”, FORMAT([Sum of Revenue], “0.0000”)
,FORMAT([Sum of Revenue], “0”)
)
)

As you can see the results are what we expect:

Capture

You can also use this to show different symbols as you would use this when doing currency conversion. One thing to note here as well is that all values get returned as string to Power BI, this means you can only use this “trick” with tables and not on charts.

One thing to observe here is that thanks to several performance optimizations the use of IF and SWITCH in Power BI desktop is significantly improved as compared to Power Pivot for Excel 2013 and SQL 2014.

21 Replies to “Dynamic format using DAX

  1. So Guys…. I get child level format and switch/if statements..fine….but what is the answer to have 1 parent measure that can return the different type of formats of its children measures. eg
    Measure A = Format(A, “percent”)
    Measure B = Format(B, “£.00”)
    Measure C = [measureA] + [measureB]

    Measure C returns an error for the reason you state as FORMAT returns a string. Yet i need different formatting depending on whether Measure C returns the % or £ result. any suggestions ?

    1. I managed a workaround using an if statement. But now FORMAT generates a blank text value for all empty rows making the layout horribly. Any answers to remove the blank text rows of the measure?

  2. Hi Kasper, how were you able to keep the results right-aligned in the table/matrix after formatting? We are struggling this this topic because the formatted numbers get treated as strings and always get left-aligned.

    1. Vitaly – I think I have stumbled on the answer to your question. I was using this post to help with this problem, and saw the same behavior as you. My use case is in Power Bi and what I have observed is that this only seems to happen within tables. If you switch you table to a matrix then the values are right aligned. The values themselves though are still type ‘Text’ so they need to be handled appropriately in other formulas etc…

  3. This works for the table output but does not work for charts; is there any way to get this to work in charts? FORMAT() returns a text value and charts don’t seem to know how to read it.

    The issue I’m having is I want the user to be able to select between a value and a percentage display in Power BI, but as soon as you add FORMAT() the chart explodes.

    1. I had the same issue! The only way around this, as far as I can tell, is to wrap your statement in an IF(ISBLANK()) statement. Something like:

      IF (

      ISBLANK ( [Your Measure] ),

      BLANK (),

      FORMAT ( [Your Measure], “0.0%” )

      )

      1. Hi
        I am having this issue, but the ISBLANK makes no difference as the value returned is a text, so no reporting tool will use it. We used a similar method in multi-dimensional all the time which worked very well with all client tools, but Tabular just doesn’t work properly for formatting.
        Any ideas on a work around without just removing all formatting?
        Thanks
        Michael

        1. @disqus_74skNxFV7h:disqus To be honest, a couple weeks after I posted that solution, we ended up ripping it out and having no default formatting. It’s not ideal at all, but then at least the users can set it to whatever they want.

  4. I need to reformat a value of 0.74 to a percentage using DAX but i cant figure out the formula can anyone help?

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