how do they figure your composite act score?
 First, add your scores from each section. Then, because there are four sections, divide that number by four. Voila! Your composite score. So let’s say you scored a 24 on English, 19 on Math, 23 on Reading, and 18 on Science, your overall composite score would be a 21. The ACT does round its averages. So if the exact calculation of your average worked out to 20.5, you’re in luck: the test would round you up to a 21. If your average worked out to 20.25, however, you would receive a 20. Scaled Scores. 