POWER USER PRO TIP
I’ve always said that SUMPRODUCT is like the Ebenezer Scrooge of Excel: mysterious, unforgiving, and deeply misunderstood. But deep down, it’s just a friendly function trying to help you do amazing things in Excel.
In this tip, we’ll combine SUMPRODUCT with COUNTIF to iterate through rows and calculate the number of matching items between two lists.
COMMON USE CASES:
- Calculating the overlap between two or more lists in Excel
- Confirming that lists are unique to avoid double-counting errors
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