One way:
=SUMPRODUCT((A1:A30>=100)*(A1:A30<=200))
Another way:
=COUNTIF(A1:A30,">=100")-COUNTIF(A1:A30,">200")
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HTH,
RD
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Please keep all correspondence within the Group, so all may benefit!
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How do I count if values in a table that are >=100 and <=200?