An ACT score report has more information on it than just the composite number, and understanding what's actually in it -- and what colleges actually look at -- makes it much easier to set a realistic target score.
How the composite is calculated
Each of the three required sections you take -- English, Mathematics, and Reading -- is scored on its own 1-36 scale, based on the number of questions you answered correctly (there's no penalty for wrong answers, so guessing costs nothing). Your composite score is the average of those section scores, rounded to the nearest whole number. If you also take the optional Science section, it's scored on the same 1-36 scale and reported separately, along with a STEM score (the average of your Math and Science scores), but it isn't part of the composite: since September 2025, ACT calculates the composite from English, Math and Reading only.
Related: What to Expect on the ACT: Format, Scoring, and How to Prepare
What percentiles actually tell you
Alongside your composite, your score report includes a percentile ranking, showing what percentage of test-takers nationally scored at or below your score. A percentile is a relative comparison, not a measure of how "hard" the test was for you -- it changes slightly from year to year as the overall pool of test-takers shifts, which is one reason a specific numeric composite target matters more for admissions purposes than the percentile itself.
What colleges actually look at
Most colleges publish a "middle 50%" score range for their admitted students -- the range that the middle half of an incoming class scored within. This is far more useful for setting a personal target than any generic "good score" benchmark, since a highly competitive score at one school may be comfortably above the typical range at another. Check the specific range published by each school on your own list, and note whether it's the range for admitted students overall or for your specific intended major, since some competitive programs (like engineering) can have higher typical ranges than the school average.
What the Writing score doesn't affect
If you take the optional Writing essay, it's scored separately on a 2-12 scale (an average of four domain scores) and never factors into your 1-36 composite in any way -- it's reported alongside your composite but calculated and evaluated completely independently. Only take Writing if a specific target school requires it; check each school's own testing policy directly, since requirements vary and can change from year to year. Try our ACT practice questions.