COUNTX DAX Function (Aggregation)
Counts the number of values which result from evaluating an expression for each row of a table.
Syntax
| Parameter | Attributes | Description |
|---|---|---|
|
Table Iterator |
The table containing the rows for which the expression will be evaluated. |
|
|
Expression Row Context By Expression |
The expression to be evaluated for each row of the table. |
Return values
Returns the number of values that are non blank by iterating the provided table.
Remarks
When the function finds no rows producing a non-blank value, it returns a blank.
COUNTX and COUNTAX are identical in DAX for all the data types except Boolean. COUNTAX can operate on a Boolean data type, whereas COUNTX cannot do that.
Examples
-- COUNT is the short version of COUNTX, when used with one column only
-- In DAX, there are no differences between COUNTA and COUNT
-- COUNTX can be expressed in a more explicit way by using CALCULATE
-- and COUNTROWS
DEFINE
MEASURE Customer[# Customers] = COUNTROWS ( Customer )
MEASURE Customer[# Individuals 1] = COUNT ( Customer[Customer Name] )
MEASURE Customer[# Individuals 2] = COUNTX ( Customer, Customer[Customer Name] )
MEASURE Customer[# Individuals 3] =
CALCULATE (
COUNTROWS ( Customer ),
NOT ISBLANK ( Customer[Customer Name] )
)
EVALUATE
SUMMARIZECOLUMNS (
Customer[Continent],
"# Customers", [# Customers],
"# Individuals 1", [# Individuals 1],
"# Individuals 2", [# Individuals 2],
"# Individuals 3", [# Individuals 3]
)
| Continent | # Customers | # Individuals 1 | # Individuals 2 | # Individuals 3 |
|---|---|---|---|---|
| Asia | 3,658 | 3,624 | 3,624 | 3,624 |
| North America | 9,665 | 9,527 | 9,527 | 9,527 |
| Europe | 5,546 | 5,525 | 5,525 | 5,525 |
-- COUNTX is needed when you need to count the result of a formula
-- In this case, COUNTX reads better than CALCULATE
DEFINE
MEASURE Customer[# Individuals Children/Car 1] =
COUNTX ( Customer, DIVIDE ( Customer[Total Children], Customer[Cars Owned] ) )
MEASURE Customer[# Individuals Children/Car 2] =
COUNTROWS (
FILTER (
Customer,
NOT ISBLANK ( DIVIDE ( Customer[Total Children], Customer[Cars Owned] ) )
)
)
EVALUATE
SUMMARIZECOLUMNS (
Customer[Continent],
"# Individuals Children/Car 1", [# Individuals Children/Car 1],
"# Individuals Children/Car 2", [# Individuals Children/Car 2]
)
| Continent | # Individuals Children/Car 1 | # Individuals Children/Car 2 |
|---|---|---|
| Asia | 3,203 | 3,203 |
| North America | 7,507 | 7,507 |
| Europe | 3,536 | 3,536 |
Related functions
Other related functions are:
Last update: Oct 22, 2025 » Contribute » Show contributors
Contributors: Alberto Ferrari, Marco Russo, Kenneth Barber
Microsoft documentation: https://docs.microsoft.com/en-us/dax/countx-function-dax