CALCULATE(expression, filter1, filter2, …)
CALCULATE(SUM('Table'[Column1]), 'Table'[Column2]="Value")
The CALCULATE function can be used to modify the filter context of an expression. For example, this formula evaluates the second expression with an additional filter context:
'Table'[Column2]="Value"
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The CALCULATE function is a powerful tool for evaluating expressions in row context. It evaluates an expression in a modified filter context, and returns the value of the expression.