A composite score is a single number that summarizes performance across subjects on standardized tests. It helps colleges quickly compare students but can hide strengths and weaknesses in individual areas.
Research from the National Home Education Research Institute (NHERI) shows that homeschooled students typically score 15 to 25 percentile points higher than public school students on standardized academic achievement tests. Studies show that homeschooled students are accepted to college at rates comparable to or higher than their traditionally schooled peers, and they tend to earn higher GPAs in their first year of college (Journal of College Admission, 2010).
What is a composite score?
Standardized tests check different academic skills. Colleges and state agencies often want a single number to sum up how well a student did. That’s the composite score. For the ACT, it’s the average of the English, Math, and Reading scores. Starting in 2025, Science won't count in this score anymore. The SAT combines scores from two sections instead of averaging. While the composite score is handy for quick comparisons, it can hide a student's true abilities. For example, a student might shine in reading but struggle in math, yet still show an average score overall.
How ACT composite is calculated
The ACT has three sections for the composite score: English, Math, and Reading. Each section is scored from 1 to 36. To find the composite, add the three scores and divide by three. If the result has a decimal, round it—below 0.5 rounds down, and 0.5 or higher rounds up. So, scores of 28, 24, and 30 average to 27.3, which rounds to 27. The optional Writing section doesn't count for the composite. As of 2025, the removal of Science from this calculation changes how scores compare to past years.
What scores mean for college
Colleges often focus on composite scores, but it’s just one part of the application. They also look at transcripts, activities, and essays. Selective colleges (those accepting less than 8% of applicants) usually see composite scores between 32 and 36. State universities often look for scores between 21 and 26. Many colleges are now test-optional, and those that require scores may use a method called superscoring. This means they'll take the best scores from different test dates to create a new, higher composite score. Retaking tests can improve your chances, even if your overall score changes.
Strategic considerations for homeschoolers
Composite scores can hide the uneven progress often seen in homeschooling. For instance, a student might have a high reading score (32) while struggling in math (24). The composite doesn't show this. When applying to colleges, make sure to highlight strong section scores and work on weaker areas. Some families pick tests carefully: the Stanford 10 is untimed, which might help students who find timed tests stressful. The ACT and SAT can meet both state needs and college admissions.
The bottom line
Understanding composite scores is key to interpreting standardized test results. Remember their limits—many colleges superscore across test dates, so retesting can really help. For state requirements, check which subjects count towards your composite score. Some states only consider math and language arts, so you can prepare accordingly. Lastly, composite scores are just one piece of the puzzle; they don't define your student’s potential.
