Measure to count total rows that doesn't depend on row grouping

[Anonymous]

Suppose I have a CSV table such as this.

MainUnit	SubUnit
A	A1
A	A2
A	A3
B	B1
B	B2
B	B3
B	B4
C	C1
C	C2
D	D1
D	D2
D	D3

My goal is to calculate, for each MainUnit, the % of it's sub unit count considering all sub units. I am aware that I can create a measure such as below,

UnitCount = COUNTA(UnitSubUnit[SubUnit])

and then in the table set it as [ Show value as --> Percent of grand total ] and it will get me the desired percentage.

But that's not quite what I'm looking for. What I want is a 'TotalUnitCount' measure, which will retun 12 in this example for each row in my table. The reason being I want to use the UnitCount and TotalUnitCount elsewhere in my project, including as parts of other measures. Essentially, this is what I'm looking for.

But it appears that if I calculate a measure like this, it will still not actually return the total number of rows, but rather still grouped acording to the row selection.

TotalUnitCount = COUNTROWS(UnitSubUnit)

When I attempted that, what I get is below; both UnitCount and TotalUnitCount return the same value.

I don't want to set a measure like 'TotalUnitCount = 12' hardcoded for two reasons.

1. The MainUnit and SubUnit count can change over time.
2. I want to be able to have a Page Level filter to filter MainUnit, and it should reflect the calculation accordingly. For example, if I chose my page level filter to select only A and C, then my desired output should be like this:
   
    

Is this a possibility without hardcoding a measure?

[Fowmy · Accepted solution]

@Anonymous 

Here are the three measures and it will work when set the page filter as well.

Unit Count = COUNTROWS(table6)
-------------------------------------------
Total unit Count = 
CALCULATE(
    [Unit Count],
    ALLSELECTED(Table6[MainUnit])
)
-------------------------------------------
Percentage = 
DIVIDE(
    [Unit Count],
    [Total unit Count]
)

________________________

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[Anonymous]

This worked, thanks!

So to make sure I understand, the CALCULATE() function sums up UnitCount, across all MainUnit rows available?