ACT Score Calculator - Composite & Subscores
Calculate your ACT composite score, ELA score, and STEM score from your English, Math, Reading, Science, and optional Writing section scores instantly.
Enter your four required section scores (1–36 each) and optionally your Writing score (2–12) to calculate your ACT composite and subscores.
ACT Score Calculator - Composite & Subscores
Calculate your ACT composite score, ELA score, and STEM score from your English, Math, Reading, Science, and optional Writing section scores instantly.
About the ACT score calculator
The ACT (originally an acronym for American College Testing) is a standardized college-admission test used widely in the United States. First administered in 1959, it now serves as a primary or supplementary admission criterion at thousands of colleges and universities. Understanding how ACT scores are calculated — and what different score levels mean for college admissions — is essential for students planning their test strategy.
The ACT consists of four required sections: English, Mathematics, Reading, and Science. Each section is scored on a scale of 1 to 36, with 36 being a perfect score. The composite score, which is the most widely reported ACT metric, is the arithmetic mean of the four section scores rounded to the nearest whole number. For example, section scores of 30, 32, 31, and 29 produce a composite of (30+32+31+29)/4 = 122/4 = 30.5, which rounds to 31.
In addition to the composite score, the ACT reports two additional subscores for test-takers who complete the optional Writing section. The ELA (English Language Arts) score combines the English, Reading, and Writing section results and is reported on the same 1–36 scale. The STEM score averages the Math and Science sections, also on the 1–36 scale. Both subscores can highlight a student's relative strengths and help colleges understand academic preparation in specific disciplines.
The optional Writing section is scored separately on a 2–12 scale by two human raters, each providing a 1–6 score across four domains. The Writing score does not affect the composite but is required by some colleges for admission or scholarship consideration. Students applying to highly selective schools should check each institution's requirements before deciding whether to complete the Writing section.
ACT score percentiles describe how a student's composite compares to all students who took the ACT in a given year. A composite of 20 corresponds roughly to the 50th percentile — the national median. A composite of 24 corresponds to approximately the 75th percentile, and a composite of 29 corresponds to roughly the 90th percentile. The national average composite score has been approximately 20–21 in recent years.
For college admissions planning, understanding score ranges is important. Highly selective universities typically look for composites of 33–36, competitive schools target 28–32, and most four-year institutions welcome students with scores in the 20–27 range. However, ACT scores are just one factor in admissions decisions alongside GPA, course rigor, extracurriculars, essays, and recommendations.
This calculator computes your composite, ELA, and STEM scores using the official ACT formulas. Enter your scaled section scores (the scores between 1 and 36 that appear on your official score report, not raw scores) for an accurate composite calculation. The percentile estimates are approximations based on recent national distributions and should not be treated as official percentile rankings.
ACT score calculator examples
Sample score profiles from different types of students showing composite calculations and approximate percentiles.
| Section Scores | Composite | Notes |
|---|---|---|
| English 30, Math 32, Reading 31, Science 29 | 31/36 | Strong performer. Composite = (30+32+31+29)/4 = 30.5 → rounds to 31. Approximately 96th percentile. STEM score: (32+29)/2 = 30.5 → 31. |
| English 25, Math 26, Reading 25, Science 26 | 26/36 | Balanced scores. Composite = (25+26+25+26)/4 = 25.5 → rounds to 26. Approximately 82nd percentile. Good for most four-year universities. |
| English 22, Math 34, Reading 21, Science 33 | 28/36 | Math-focused student. Composite = (22+34+21+33)/4 = 27.5 → rounds to 28. STEM score = (34+33)/2 = 33.5 → 34, excellent for STEM programs. |
| English 18, Math 17, Reading 19, Science 18 | 18/36 | Improvement needed. Composite = (18+17+19+18)/4 = 18. Approximately 37th percentile. Targeted prep in Math and English would have the highest impact. |
How to use the ACT score calculator
- Enter your scaled scores (1–36) for English, Math, Reading, and Science — these are the section scores from your official ACT score report, not raw question counts.
- Optionally enter your Writing score (2–12) if you took the Writing section. This is required for the ELA subscore calculation.
- Click Calculate ACT Score to see your composite score, ELA score (if Writing was entered), STEM score, and approximate national percentile.
- Use the example preset buttons to explore common score profiles and understand how different section performances affect the composite.
- If your composite is not where you want it, identify your lowest section score — improving the weakest section has the largest impact on the composite.
ACT score calculator FAQ
How is the ACT composite score calculated?
The ACT composite is the arithmetic mean of the four required section scores (English, Math, Reading, Science), rounded to the nearest whole number. Each section is scored from 1 to 36. A composite of 20 is the national median. Fractional averages of exactly X.5 round up to X+1 per ACT rounding rules.
Does the Writing score affect the composite?
No. The ACT Writing score (2–12) does not affect the composite score. It is reported separately and contributes to the ELA (English Language Arts) subscore. However, many selective colleges require the Writing section for admission or scholarship consideration, so check your target schools' requirements before deciding whether to take it.
What is the ELA score and how is it calculated?
The ELA score combines English, Reading, and Writing performance on the 1–36 scale. It is calculated by averaging the three section-level scores associated with these areas and rounding to the nearest whole number. The Writing component is scaled from its 2–12 score to align with the English and Reading 1–36 scale before averaging.
What is a good ACT score for college admissions?
A score of 20 is the national average (roughly 50th percentile). A composite of 24–27 is competitive for most four-year colleges, 28–32 for selective schools, and 33–36 for highly selective institutions. However, ACT scores are considered alongside GPA, coursework rigor, and other factors, so there is no single cutoff that guarantees admission or rejection.
How many times can I take the ACT?
Students can take the ACT as many times as they choose. Most test more than once to improve their scores. Colleges typically consider the highest composite score achieved across all test dates, and many use "superscore" policies that combine the best section scores from different test dates into a new, higher composite.
What ACT score do I need for merit scholarships?
Merit scholarship requirements vary widely by institution. Many state universities offer automatic scholarships for composites of 25–27+, while competitive private scholarships often require 30+. The National Merit Scholarship program is based on the PSAT/NMSQT, not the ACT. Check individual scholarship eligibility criteria, as some specify minimum section scores in addition to the composite.