IQ to ACT converter

The ACT score people at each IQ typically get, from the same model as the calculator and the ACT to IQ converter. The likely range covers about four in five people at that IQ. The last column shows how rare the IQ itself is in the general population.

People with the same IQ do not get the same ACT score. In this model the ACT explains about 52% of the variation in IQ among test-takers (r = 0.72, squared). The rest is knowledge, preparation, motivation and luck on the day. Around the typical score, one standard deviation is about 4 points, so four in five people at an IQ of 130 land between 22 and 35.

The two directions are not inverses

An IQ of 130 points to a typical ACT of 30. Put 30 into the ACT to IQ converter and you get 117, not 130. Both directions regress to the mean: very high IQs usually come with high but not quite as high scores, and very high scores usually come from people who are high but not quite as high on IQ. It is the same effect as tall parents having children who are tall, but a little closer to average.

Many converters use percentile matching. They find how rare an IQ of 130 is (about 1 in 44 people), then give the ACT score that is just as rare among test-takers. For 130 that is 33. It answers “how rare is this?” and treats the ACT as a perfect IQ test.

The ACT is not a perfect IQ test. With a correlation of 0.72 the typical score at an IQ of 130 is 30, which is 3 lower. The gap grows at the extremes.

From 2025 the ACT was shortened and Science became optional, so the composite for most students is now the average of English, Math and Reading. ACT has not yet published national norms for that three-section composite. This chart uses the Class of 2025 profile report, which still mostly reflects the four-section version.

If you took the newer version, treat the result as approximate. The direction and rough size should hold, and a point either way is well inside the uncertainty. The ACT to IQ converter covers scores going the other way.

Evidence grade: moderate. A published comparison exists, from the same research group and design as the SAT study. It used a general-ability score from a military battery and a pre-2025 ACT, not a Wechsler test on the current exam.

Typical score = ACT mean + r × ACT SD × (IQ − 101) ÷ 14, then mapped through the published percentile table. The spread around it is the ACT SD × √(1 − r²), and the likely range is the typical score plus or minus 1.28 of those, capped at the ends of the scale. For the ACT the middle of that calculation is 19.4 + 0.72 × 5.9 × (IQ − 101) ÷ 14.

Published facts we used

• ACT composite and ASVAB-derived general ability: r = .77 (N = 1,075; Koenig, Frey and Detterman, 2008).
• ACT composite and Raven's Advanced Progressive Matrices: r = .61 (N = 149).
• Class of 2025 composite mean 19.4, SD 5.9, N = 1,380,130 (ACT profile report).
• Cumulative percentiles for each composite score.

Assumptions we made

• Mean IQ of ACT test-takers: 101. This is our assumption.
• IQ spread among test-takers: SD 14.
• Correlation between ACT and IQ among test-takers: .72, between the two published values and lowered for selection.