I just wiki'd it, apparently their is no official height however 40m is the best guess.
"The height of the Evas is never officially established, but they are clearly several stories in height, and can be inferred to be about 40 meters tall from several clues: size of hands compared to people, footprint size of Sachiel, relative sizes for entry plugs, and comparisons to buildings, weapons, and vehicles, including destroyers and helicopters. Their monstrous appearance is no accident"
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