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The ACT is one of the two standardized exams used for undergraduate college admissions in the United States, and it is scored on a 1–36 scale rather than the SAT’s 400–1600. Because that scale is compressed, a single point matters: one composite point can move you several percentiles and change which schools treat your score as competitive.

Use the ACT score calculator below to turn the raw scores from a practice test into estimated scale scores, a composite, and the national percentile each of them lands in.

How is the ACT scored?

Since the Enhanced ACT rolled out, the core test is three required sections — English, Math, Reading — with Science and Writing offered as optional add-ons. This is the single most important change for scoring purposes: your composite score is the average of English, Math and Reading only. Science no longer counts toward it, and is reported as a score of its own.

The gap between the two question columns catches most people out, and it is the reason a raw score copied straight off a practice test can produce the wrong estimate. Every ACT section now contains embedded field-test questions — items ACT is trialling for future exams that do not count toward your score. You are never told which ones they are, so an official practice test reports your raw score out of the scored count, not out of everything you answered.

Scoring an ACT then runs in three steps:

• Raw score. Count the scored questions you answered correctly in each section. There is no penalty for a wrong answer, so a guess can only help you.
• Scale score. Each section’s raw score converts to a 1–36 scale score using a conversion table published with that specific test form. The conversion adjusts for how hard that form was, which is why a raw 35 in Math is not always the same scale score.
• Composite score. Add the English, Math and Reading scale scores and divide by three. ACT rounds the result to the nearest whole number, rounding a half or more up.

What do ACT score percentiles mean?

A percentile — ACT calls it your national rank — is the percentage of recent test takers who scored at or below you. A composite of 22 sits at the 72nd percentile, meaning 72% of recent ACT-tested graduates scored 22 or lower. The table below shows how quickly the scale steepens near the top, using ACT’s published national ranks for ACT-tested high school graduates of 2023, 2024, and 2025:

Notice how flat the top of the table is and how steep the middle is. Between a 20 and a 26 you climb roughly 23 percentile points; between a 30 and a 36 you climb only 6. That is why improvement work in the middle of the scale pays off so much faster than chasing a perfect score, and why it is worth knowing exactly where you stand before you plan your studying.

ACT score calculator

Set each slider to the number of scored questions you answered correctly on a practice test. The calculator converts each section to its 1–36 scale score, reports the national percentile for each one, and averages English, Math and Reading into your composite. Science is scored alongside them but held out of the composite, exactly as ACT reports it.

Treat the output as an estimate rather than a promise. ACT publishes a separate raw-to-scale conversion table with every test form, because each form’s table compensates for that form’s difficulty; this calculator uses the table from an official Enhanced ACT practice test, so a live exam can differ by a point or two in either direction. The percentiles, by contrast, are ACT’s own published national ranks and are not an approximation. The most useful way to read the result is comparatively: run it after each practice test and watch which section moves.

What is a good ACT score?

The national mean composite is 19.2, with section means of 18.6 in English, 19 in Math, 20.1 in Reading and 19.6 in Science. Anything above that beats the typical test taker, but “good” is really a question about the schools on your list. A 24 lands near the 80thpercentile and is competitive at most state flagships; a 30 clears the 94th and starts to look strong at selective private universities; a 33 or better sits at the 98th percentile and up, which is the range the most selective schools in the country report.

The honest benchmark is the middle 50% range each college publishes for its admitted class. Aim for the top of that range rather than the bottom, and remember that a strong ACT score does more than clear an admissions bar — many merit scholarships are awarded on score thresholds, so a point or two can be worth real money.

How do I increase my ACT score?

Start by finding out where you actually are. Take a full-length ACT practice exam under timed conditions, score it with the calculator above, and read the four section scores rather than the composite. Because the composite is an average of three sections, the fastest route up is almost always the weakest of the three — a student sitting at 30/30/22 gains far more from Reading work than from squeezing another point out of Math.

The ACT is a pacing test as much as a content test. Its sections are short and fast, so a student who knows the material can still lose points simply by running out of time. Practice whole sections against the clock rather than untimed question sets, and after every practice test separate the questions you got wrong because you didn’t know the content from the ones you got wrong because you rushed — they call for completely different fixes.

From there, work the content gaps deliberately. Our ACT prep course uses spaced repetition to keep reviewed material from slipping away between practice tests, and our ACT exam guide covers the structure, timing and registration details in full. Re-run this calculator after each practice test: a composite that is climbing tells you the plan is working, and a section that is stuck tells you where to spend the next fortnight.

ACT or SAT — which score should you send?

Colleges accept both exams and state no preference between them, so the question is which one you score better on relative to other test takers. Percentiles are what make that comparison possible: a 29 on the ACT and a 1350 on the SAT sit at roughly the same national rank, so the exam to sit is whichever puts you higher up its own curve. If you have taken practice tests for both, run each through its calculator and compare percentiles rather than raw scale scores — our Digital SAT score calculator does the same job for the 400–1600 scale. If you are still deciding, our guide to choosing between the ACT and SAT walks through the differences in format and timing.

Explore our other score calculators

Sitting AP exams alongside the ACT? Estimate those results too with our free AP score calculators:

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Taking the SAT as well? Our Digital SAT score calculator converts practice-test raw scores into scaled section scores on the 400–1600 scale, plus the percentile each one lands in.

Key takeaways

• Your ACT composite is the average of English, Math and Reading only, rounded to the nearest whole number. Science is optional and reported separately.
• Raw scores are counted out of scored questions, not the questions you answer — each section hides unscored field-test items.
• Scale scores are estimates, because the conversion table changes with each test form; percentiles come straight from ACT’s published national ranks.
• The middle of the 1–36 scale is where points are worth the most percentile movement, so work your weakest required section first.

Once you know where you stand, build the study plan around it. Our comparison of the best ACT prep courses lays out the options, and the ACT FAQ answers the questions students most often ask about scoring, retakes and superscoring.