If you work with sales data, budgets, or inventory, SUMIF and COUNTIF are the formulas you'll use every single day. They answer questions like "How much did we sell in the East region?" or "How many orders are over $500?" — in one formula, no manual filtering required.
=SUMIF(range, criteria, [sum_range])
=SUMIF(B2:B100, "East", D2:D100) → Sum all sales in column D where column B says "East"=SUMIF(C2:C100, ">500") → Sum everything over $500 in column C=SUMIF(A2:A100, "New*", B2:B100) → Sum values where product starts with "New"=SUMIFS(sum_range, range1, criteria1, range2, criteria2)
=SUMIFS(D:D, B:B, "East", C:C, ">1000") → Sum column D where region="East" AND sales>1000. Supports up to 127 condition pairs.
=COUNTIF(C:C, ">100") → Count how many cells in C are over 100=COUNTIFS(B:B, "Complete", C:C, ">="&TODAY()) → Count completed tasks due today or later=AVERAGEIF(B:B, "East", C:C) → Average of column C where column B is "East"
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