ACT Score Calculator
Free ACT score calculator for the Enhanced ACT (September 2025 onward) and historical tests. Enter your section scores to get the official composite — the rounded average — plus your STEM and ELA scores, percentile rank and college readiness benchmarks. Includes a superscore planner for multiple test dates, a reverse solver that tells you the score you need on one section, and an estimated raw-to-scaled converter. 100% client-side: your scores never leave this browser.
Composite score calculator
Superscore planner — multiple test dates
Enter the section scores from each sitting. Your superscore is the rounded average of your best section score across all dates.
Reverse solver — what do I need on one section?
Fix three sections and a target composite; the solver tells you the score the remaining section must reach. Remember: you need an unrounded average of target − 0.5, not the target itself.
Raw → scaled (estimated)
Estimate only. Real ACT equating tables differ per test form. Enter the number of correct answers; the estimate follows published official practice-test curves.
How ACT scoring works
Every ACT section is scored on a 1–36 scale. Your raw score — simply the number of questions you answered correctly, with no penalty for wrong answers — is converted to a scaled score through a process called equating, which keeps scores comparable across test forms of slightly different difficulty. Because equating differs for every test form, raw-to-scaled tables vary from one administration to the next; the maxima are English 75, Math 60, Reading 40 and Science 40 questions.
The headline number colleges see is the composite score: the arithmetic mean of your section scaled scores, rounded to the nearest whole number, with a fractional part of exactly one-half rounded up. That half-point rule is the single most important detail in ACT math — an unrounded average of 29.5 earns a 30, so the true cutoff for any target composite T is an average of T − 0.5.
The Enhanced ACT changed the formula in September 2025: Science became optional, and when you skip it the composite is computed from just English + Math + Reading — a fully official composite on the same 1–36 scale. Tests taken before September 2025 keep the classic four-section composite; ACT did not recalculate historical reports.
Beyond the composite, ACT reports two derived scores. The STEM score is the rounded average of Math and Science — it requires the Science section. The ELA score is the rounded average of English, Reading and Writing, and is reported only if you took the optional Writing test (scored 2–12, never part of the composite).
Worked example 1 — historical composite
A student earns English 28, Math 30, Reading 27, Science 29 on a pre-September-2025 test.
- Sum the sections: 28 + 30 + 27 + 29 = 114.
- Divide by 4: 114 / 4 = 28.5.
- Apply the rounding rule: .5 rounds up → composite 29.
- STEM: (30 + 29) / 2 = 29.5 → 30.
- ELA with Writing 10: (28 + 27 + 10) / 3 = 21.67 → 22.
- Benchmarks: all four met (English 28 ≥ 18, Math 30 ≥ 22, Reading 27 ≥ 22, Science 29 ≥ 23).
Worked example 2 — Enhanced ACT, Science skipped
A student earns English 24, Math 26, Reading 28 and skips Science.
- Sum the three required sections: 24 + 26 + 28 = 78.
- Divide by 3: 78 / 3 = 26.0 → composite 26.
- No STEM score is reported without Science; the composite itself is fully official.
Worked example 3 — reverse solver
A student has English 28, Math 30, Reading 27 and wants a composite of 30 on a historical (four-section) test. What must Science be?
- The unrounded average must reach 30 − 0.5 = 29.5.
- Required total: 4 × 29.5 = 118 scaled points.
- Subtract the fixed sections: 118 − (28 + 30 + 27) = 118 − 85 = 33.
- Answer: Science 33 (a 32 gives 117 / 4 = 29.25 → 29 — one point short).
ACT College Readiness Benchmarks
Official ACT benchmarks — the minimum score linked to about a 50% chance of a B or a 75% chance of a C in the matching first-year college course.
| Score | Benchmark | Matching college course |
|---|---|---|
| English | 18 | English Composition |
| Math | 22 | College Algebra |
| Reading | 22 | Social Sciences |
| Science | 23 | Biology |
| STEM | 26 | STEM courses |
| ELA | 20 | English / Social Sciences |
Composite score percentiles
Percent at or below this score — based on the ACT National Profile Report, Graduating Class of 2022 (act.org). Dated comparison, not your official rank for another reporting year.
| Composite | Percentile |
|---|---|
| 36 | 100 |
| 33 | 98 |
| 30 | 94 |
| 27 | 88 |
| 24 | 78 |
| 21 | 65 |
| 20 | 59 |
| 18 | 48 |
| 16 | 35 |
Raw-to-scaled conversion (estimated sample)
Estimate only. ACT equating tables differ for every test form; this sample follows published official practice-test curves. Always use the scoring key of the form you took for an official result. Maxima: English 75 · Math 60 · Reading 40 · Science 40.
| Raw (correct answers) | English (75 max) | Math (60 max) | Reading (40 max) | Science (40 max) |
|---|---|---|---|---|
| 75 / 60 / 40 / 40 | 36 | 36 | 36 | 36 |
| 60 / 50 / 32 / 32 | 31 | 31 | 31 | 30 |
| 45 / 38 / 24 / 24 | 26 | 25 | 26 | 24 |
| 30 / 26 / 16 / 16 | 20 | 19 | 20 | 17 |
| 15 / 14 / 8 / 8 | 13 | 12 | 11 | 9 |
Practical tips
- Never leave a blank. There is no guessing penalty, so a random guess has positive expected value — an unanswered question is a guaranteed zero.
- Play the rounding boundary. One extra scaled point anywhere is worth a full composite point when your unrounded average sits at x.49 — the reverse-solver tab shows exactly where that point pays off.
- Superscore policies differ. ACT supports superscoring and many colleges accept it, but some want all scores or your best single sitting — confirm each school's policy before planning retakes around it.
- STEM-bound students: on the Enhanced ACT, skipping Science costs you the STEM score, which engineering and science programs sometimes request.
- Benchmarks are course-readiness signals, not admission cutoffs. Colleges publish their own score ranges; compare your section scores against each school's middle 50%.
Sources: ACT, Inc. — official score-report documentation (act.org), ACT National Profile Report Graduating Class 2022, ACT College and Career Readiness Benchmarks. See SOURCES.md in this folder for the full list.
Frequently asked questions
How is the ACT composite score calculated?
The composite is the arithmetic mean of your section scaled scores, rounded to the nearest whole number, with halves rounded up. For the Enhanced ACT (tests from September 2025 onward), it is (English + Math + Reading) / 3. For historical tests it is (English + Math + Reading + Science) / 4. For example, section scores of 28, 30, 27 and 29 sum to 114; 114 / 4 = 28.5, which rounds up to a composite of 29.
What is the Enhanced ACT and how does it change scoring?
The Enhanced ACT rolled out in April 2025 and became standard in September 2025. Its headline change is that the Science section is now optional. If you skip Science, your composite is computed from just English, Math and Reading. The scoring rules themselves did not change: same 1-36 scale, same round-half-up rule. Historical score reports are not recalculated; they keep their original four-section composite.
How does ACT rounding work? What happens at exactly .5?
ACT rounds the unrounded average to the nearest whole number, and a fractional part of exactly one-half rounds UP. So 27.5 becomes 28, while 27.49 becomes 27. The same rule applies to the STEM and ELA scores. Practically, this means the cutoff for a target composite T is an unrounded average of T - 0.5: to reach a 30 you need an average of at least 29.5, not 30.
What is an ACT superscore and how do I calculate it?
A superscore takes your best section score across multiple test dates and averages those bests, using the same rounding rule. Suppose your English bests are 24, 30 and 27 across three sittings; Math bests 28, 25 and 31; Reading 26, 29 and 24; Science 30, 27 and 28. The section bests are 30, 31, 29 and 30, which average to 120 / 4 = 30 - that is your superscore. ACT supports superscoring, but each college sets its own policy, so check the schools you are applying to.
What is the ACT STEM score?
The STEM score is the rounded average of your Math and Science scaled scores: round((Math + Science) / 2) on the 1-36 scale. For example, Math 30 and Science 29 give 59 / 2 = 29.5, which rounds up to 30. The College Readiness Benchmark for STEM is 26. On the Enhanced ACT it is still reported as long as you took the Science section.
What is the ACT ELA score?
The ELA (English Language Arts) score is the rounded average of your English, Reading and Writing scores: round((English + Reading + Writing) / 3) on the 1-36 scale. For example, English 28, Reading 27 and Writing 10 give 65 / 3 = 21.67, which rounds to 22. It is only reported if you took the optional Writing test, and the College Readiness Benchmark for ELA is 20.
Does the Writing score affect my ACT composite?
No. The Writing test is scored separately on a 2-12 scale and never enters the composite calculation. It is used only for the ELA score, together with English and Reading. Skipping Writing does not lower your composite; it just means no ELA score is reported.
What are the ACT College Readiness Benchmarks?
ACT publishes the minimum scores linked to about a 50% chance of a B or a 75% chance of a C in the matching first-year college course: English 18 (English Composition), Math 22 (College Algebra), Reading 22 (Social Sciences), Science 23 (Biology), STEM 26 and ELA 20. Meeting a benchmark suggests you are academically ready for college work in that subject.
What does my ACT percentile mean?
A percentile (reported as US Rank on score reports) tells you the share of test-takers who scored at or below your score. This tool uses the ACT National Profile Report for the Graduating Class of 2022, the most recent full national norms table published by ACT. On those norms, a composite of 30 means about 94% scored at or below you, and a composite of 21 means about 65%. Treat it as a dated comparison, not your official rank for another reporting year.
How do I convert raw scores to scaled scores?
Your raw score is simply the number of questions you answered correctly - there is no penalty for wrong answers, so always fill in every item. ACT converts raw scores to the 1-36 scaled scale through equating, and the conversion table differs for every test form, so no single table is exact for all forms. The maximum raw scores are English 75, Math 60, Reading 40 and Science 40. This tool estimates the conversion from published official practice-test curves and labels it clearly as an estimate; for an official result, use the scoring key of the form you took.
What score do I need on one section to reach my target composite?
Because of the rounding rule, the unrounded average must reach target minus 0.5. The calculator rearranges the formula: needed = n * (target - 0.5) - (sum of your other sections), rounded up, where n is 3 for the Enhanced ACT or 4 for the historical one. Example: with English 28, Math 30 and Reading 27 on a historical test and a target of 30, you need 4 * 29.5 - 85 = 118 - 85 = 33 on Science. If the answer is above 36, the target is unreachable from those fixed sections.
Can I get a composite score without taking the Science test?
Yes, on the Enhanced ACT. Beginning with tests in September 2025, ACT computes the composite from English, Math and Reading alone when Science is not taken - it is a fully official composite, reported on the same 1-36 scale. Your STEM score cannot be computed without Science, but the composite, percentile and benchmarks for the other sections are all still reported.
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