CALCULATE in DAX explained — filter once, sum once, the foundation of every measure #PowerBI #DAX

*Description:**
Microsoft's own definition: "Evaluates an expression in a context modified by filters." That's CALCULATE. The single most-used DAX function, the one your whole financial model rests on.

CLOSING_BALANCE_QTY =
VAR COMPANY_NAME = 'Voucher Inventory'[Companyname]
VAR ITEM_NAME = 'Voucher Inventory'[Itemname]
VAR DATE_COMPARE = 'Voucher Inventory'[DocumentDate]

VAR B = CALCULATE(
SUM('Voucher Inventory'[Debit_quantity]) - SUM('Voucher Inventory'[Credit_quantity]),
FILTER('Voucher Inventory',
'Voucher Inventory'[Itemname] = ITEM_NAME
&& 'Voucher Inventory'[Companyname] = COMPANY_NAME
)
)
RETURN B

Read it as: "Compute Debit minus Credit, but only over the rows where item and company match these VAR values." The filter argument overrides the natural row context. That's the whole idea.

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