Crossword Genius

Uber calculation, for short (3)

Ross

I believe the answer is:

eta

(Other definitions for eta that I've seen before include "When you'd expect to see" , "When one is due" , "Greek letter E; estimated time of arrival (abbr.)" , "Greek H" , "Something like 10 [RHO]" .)

I've seen this clue in The New York Times.
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