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Windows, PowerShell, and productivity software guides for IT professionals and business users. Step-by-step tutorials and reference guides.

COUNTIF is one of those Excel functions that sounds simple but turns out to be useful in dozens of situations. At its most basic, it counts how many cells in a range match a condition you set. That mi...

If you need to add up values in a spreadsheet only when they meet a certain condition — for example, total sales for one product, or all expenses in a specific category — SUMIF is the function you nee...

How to Use VLOOKUP in Excel

VLOOKUP is one of the most useful formulas in Excel, and once you understand how it works, it will save you hours of manual searching. It lets you look up a value in one column and automatically pull ...

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