=average(if(a1:a1017,a1:a10))

This is an array formula. Hit ctrl-shift-enter instead of enter. If you do it
correctly, excel will wrap curly brackets {} around your formula. (don't type
them yourself.)

This will average only the numbers in A1:A10 that are greater than 17.

(I'm not quite sure how to translate your example, though.)

Bruce wrote:

How could I calc an averageif in a similar way to the sumif function?

i.e. Average if A2 = B2 from C2

Bruce

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Dave Peterson