ACT Test Score Calculator
Turn your four section scores into an ACT composite — and see where it ranks nationally.
Just an average
The composite is simply the average of your four sections, rounded to the nearest whole number.
Percentiles shift
National percentile ranks are updated each year by ACT, so treat the figure as a close estimate.
How is the ACT composite score calculated?
The average of four sections
The ACT reports four section scores — English, Math, Reading, and Science — each on a scale of 1 to 36. Your composite score, the headline number colleges see first, is just the average of those four, rounded to the nearest whole number. There is no weighting and no secret formula: a 30 in Math counts exactly as much as a 30 in Reading. According to ACT, the official scoring body, the composite is the single best summary of overall performance, which is why it anchors admissions and scholarship decisions. This calculator works it out and adds the national percentile rank so you can see how the score compares.
The math is a plain average with a single rounding rule.
composite = round((English + Math + Reading + Science) / 4)Add the four section scores, divide by four, and round to the nearest whole number — halves round up, so a 23.5 average becomes a 24. Because each section is equally weighted, the fastest way to raise your composite is to lift your weakest section, since it drags the average down the most. Research shows that targeted practice on a single low section often moves the composite more than broad review across all four. The composite cannot exceed any individual ceiling either: with all sections capped at 36, the highest possible composite is a perfect 36.
Suppose you score 24 in English, 22 in Math, 25 in Reading, and 23 in Science.
Add the sections
24 + 22 + 25 + 23 = 94.Divide by four
94 ÷ 4 = 23.5, the raw section average.Round to a whole number
23.5 rounds up to a composite of 24.Read the percentile
A composite of 24 sits around the 73rd percentile nationally — better than roughly three-quarters of test-takers.
Two numbers describe your result: the score itself and how it ranks.
The composite
Your headline 1–36 score. Most competitive universities look for the mid-20s and up; the national average sits around 19–20.
The percentile
The share of test-takers scoring at or below you. A 90th percentile means you out-scored about nine in ten.
Your weakest section
Because the composite is an average, raising your lowest score lifts the composite the most per point of effort.
If you are tracking your academic profile more broadly, our GPA calculator turns your grades into a cumulative average, and our AP Calculus score calculator estimates an AP exam score from raw points. Together with your ACT composite they paint the fuller picture admissions officers consider.
The composite is what most colleges quote and compare, while the section average shows the unrounded figure behind it — useful for seeing how close you are to the next whole number. The percentile puts the score in national context: official guidelines from ACT publish these ranks each year so students can gauge competitiveness. Remember that admissions is holistic — a composite is one factor alongside grades, essays, and activities — and that superscoring, where some colleges combine your best section scores across multiple test dates, can lift the composite they consider above any single sitting.
The arithmetic is exact; the percentile is an estimate.
Percentiles are approximate and updated yearly
This calculator computes the official composite exactly, but the national percentile is based on ACT's published norms, which are revised each year and can shift by a point or two between cohorts. It also does not model the optional Writing test, STEM or ELA sub-scores, or college-specific superscoring policies. Use the composite as the definitive figure and the percentile as a close guide, and check the latest official norms and each college's requirements when making decisions.