ACT to IQ Conversion: Chart, Correlation and Caveats
An ACT to IQ conversion can only give you a ballpark. Research has found that ACT scores correlate strongly with general intelligence (around 0.77 in one well-known study), so a 34 usually means strong reasoning, but ACT, Inc. has never published an official ACT to IQ chart, and any exact number is a guess with a wide margin.
If your real question is "how good am I at reasoning, and where do I lose points?", IQ Tester answers that directly instead of through a proxy: Find my weak spots.
ACT to IQ: can you convert it?
Short version: you can estimate, you can't convert.
Picture a group chat where someone drops their ACT and asks "so what's my IQ?" The honest reply is a range. Here's why:
- The ACT is a college readiness test. It checks English, math, reading and (depending on the version) science, all tied to what you learned in school.
- IQ tests aim at reasoning in general, often with puzzles that don't depend on classes.
- The two overlap a lot, but not completely.
So the ACT to IQ equivalent you'll see anywhere, including on Reddit, is based on percentiles and research correlations, not an official formula.
ACT to IQ conversion chart
This rough ACT to IQ conversion chart matches your composite percentile among test-takers, nudged for the fact that ACT-takers are mostly college-bound students rather than everyone.
| ACT composite | Rough IQ estimate | Roughly top... of ACT takers |
|---|---|---|
| 20 | 98-104 | About half |
| 24 | 106-112 | ~25% |
| 26 | 110-116 | ~16% |
| 28 | 114-120 | ~10% |
| 30 | 118-124 | ~6% |
| 32 | 122-128 | ~3% |
| 34 | 127-133 | ~1% |
| 36 | 133+ | A tiny fraction |
Percentile columns shift a little each year, so check ACT's own current percentile tables if you need an exact figure for your score.
How to use this chart without fooling yourself
- Find your composite, not your best single section.
- Read the whole range, not the middle number.
- Remember prep: if you took the ACT four times with a tutor, your score shows effort and skill, not just raw reasoning.
What a 28, 32 or 34 ACT suggests
People search specific scores, so let's go one by one.
28 ACT to IQ conversion
A 28 puts you around the top 10% of ACT test-takers. On a rough ACT to IQ score estimate, that's in the mid-to-high 110s. Translation: clearly above average, strong enough for plenty of selective colleges.
32 ACT to IQ conversion chart
A 32 is about the top 3-4%. Estimates land in the mid-120s. That's a high score by any standard, and the jump from 28 to 32 is harder than it looks on paper.
34 ACT to IQ conversion
A 34 is roughly the top 1%. The estimate lands around 127 to 133. Above this point, the ACT starts to run out of room.
What about a 36?
A perfect 36 is rare, but the ACT can't tell a 36 from someone who would have scored "38" if the test went higher. That's called a ceiling effect, and it means a 36 ACT IQ estimate is "high, exact number unknown."
Here's the annoying part: a composite blends four sections, so you can't tell from one number whether your reading carried you or your math did. IQ Tester splits your result into four reasoning categories (number series, verbal analogy, logic, pattern) and shows your strongest ones, so you can see the shape of your thinking, not just a total. Find my weak spots
How strong is the ACT-IQ link?
The main study here is by Katherine Koenig, Meredith Frey and Douglas Detterman, published in the journal Intelligence in 2008. Using a national sample, they found ACT scores correlated at roughly 0.77 with a general intelligence factor taken from a separate test battery.
What that means for you:
- Strong, not perfect. A correlation around 0.77 still leaves lots of people scoring higher or lower than the "predicted" IQ.
- About groups. It tells us what happens on average across thousands of students, not what's true about your brain.
- Older data. The study used ACT scores from earlier cohorts. The ACT has since changed, including a shorter format introduced in 2025 where science became optional.
Does the ACT measure intelligence?
Partly. The ACT rewards reading speed, algebra, grammar and data interpretation, and much of that is learned. Raw reasoning is in there, but so is how well your school prepared you and how much you practiced. That's why the ACT score to IQ correlation is strong but still leaves wiggle room.
ACT vs SAT as IQ proxies
People often ask whether the ACT or SAT is "more like an IQ test." Here's the comparison:
| ACT | SAT | |
|---|---|---|
| Scale | 1-36 composite | 400-1600 |
| Key study | Koenig et al. 2008, r ≈ 0.77 | Frey & Detterman 2004, r ≈ 0.8 |
| Style | Faster pace, more questions per minute | Fewer questions, more time each |
| Science | Optional section in the newer format | No separate science section |
| Ceiling | 36 | 1600 |
Both are decent proxies and both are imperfect. The ACT leans more on speed, so if you're a careful, slow thinker it may underestimate you. For the full SAT breakdown, see SAT score to IQ conversion.
UK and Canada readers
UK students take GCSEs and A-levels (Year 11 and Year 13), which are subject exams, and many UK schools use CAT4 for reasoning instead. See what is a good CAT4 score if that's you. In Canada, grade 12 marks vary by province and don't convert to IQ, and you'd only take the ACT for US applications.
Why a reasoning test tells you more
An act to iq calculator gives you one number and nothing to do with it. A direct reasoning test is more useful because:
- It's built to measure reasoning, not school content.
- It can show category strengths, like whether logic or patterns is your thing.
- It points you at what to practice next, which is the part that actually helps on your next exam.
If you're weighing college options, you might also like average IQ of college students, which explains why the "college = genius" idea is outdated.
Go beyond act to iq conversion and find your real strengths
Your ACT says where you landed on one Saturday morning. In the next few minutes, IQ Tester's 20 untimed questions give you a score band plus three of your four category strengths, and its guides turn your weak spots into a short daily drill. No clock, and your answers save if you close the tab.
FAQ
What IQ is a 30 on the ACT?
A 30 ACT roughly suggests an IQ in the high 110s to low 120s. That's a strong score, but treat it as a range because the conversion isn't official or exact.
Is there an official ACT to IQ conversion chart?
No. ACT, Inc. publishes percentiles, not IQ equivalents. Every ACT to IQ conversion chart online is an estimate built from percentiles and research correlations.
Is the ACT an IQ test?
No. It's a college readiness test that overlaps with IQ. Research shows a strong correlation, but school content, test prep and speed all affect ACT scores too.
Is the ACT or SAT closer to an IQ test?
They're similar. Published correlations with general intelligence are around 0.77 for the ACT and 0.8 for the older SAT, which is close enough that neither is clearly "the IQ one."
What does Reddit say about ACT to IQ?
Reddit threads mostly repost unofficial charts, and people often overestimate how precise they are. They're fun for comparing, but don't treat any single number as your real IQ.