Convert IQ ↔ ASVAB AFQT
How the conversion works
IQ and ASVAB AFQT scores are normalised on bell-curve distributions. The conversion maps a person's standing in one distribution to the equivalent standing in the other.
- IQ: mean 100, standard deviation 15.
- ASVAB AFQT: reported as a percentile rank against the 1997 reference sample of 18-23-year-old Americans, so it spans 1-99 with a built-in median of 50. The underlying ASVAB sub-test scores correlate with IQ at around 0.8-0.9.
IQ-equivalent = (target − meantarget) / SDtarget × 15 + 100
target-equivalent = (IQ − 100) / 15 × SDtarget + meantarget
Common IQ ↔ ASVAB AFQT reference table
| IQ | ASVAB AFQT | Percentile |
|---|---|---|
| 80 | 9 | ~9th |
| 90 | 25 | ~25th |
| 100 | 50 | ~50th |
| 110 | 75 | ~75th |
| 120 | 91 | ~91st |
| 130 | 98 | ~98th |
Important caveats
- The AFQT is essentially a percentile rank on the cognitive composite of the ASVAB. Because the AFQT is reported as a percentile rather than a standard score, the conversion is direct via the IQ-to-percentile mapping. Military branches have AFQT minimums (e.g., Army 31, Marines 32, Navy 35, Air Force 36) that correspond to IQ ranges roughly 85-90 and above.
- Extreme-tail conversions are less reliable because both tests have fewer calibration cases there.
- No score entered here is stored, submitted, or connected to an account.
What is the ASVAB and the AFQT?
The ASVAB (Armed Services Vocational Aptitude Battery) is the standardized entrance and placement test used by all branches of the US military. It is made up of 10 subtests covering verbal, math, science, and technical knowledge, and from four of those subtests (Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge, and Paragraph Comprehension) the military computes the AFQT (Armed Forces Qualification Test) score, which is reported as a percentile from 1 to 99. The AFQT percentile is what determines whether you qualify to enlist, while the other subtest scores determine which jobs you are eligible for.
The AFQT is the cognitive core of the ASVAB and is the figure people usually mean when they ask about their "ASVAB score." Because it is a percentile rank against a nationally representative reference sample of 18-to-23-year-old Americans (the 1997 norming study), an AFQT of 50 means you scored higher than 50 percent of that reference group. The AFQT loads heavily on general cognitive ability (the "g" factor that IQ tests measure), and large studies have reported correlations of roughly 0.8 between AFQT and standard IQ measures, which is why an AFQT percentile can be mapped onto an IQ-equivalent score. The ASVAB is administered free to applicants and to over a million high school students each year through the Career Exploration Program, making it one of the most widely taken aptitude tests in the United States.
The 10 ASVAB subtests and what they measure
The ASVAB is not a single test but a battery of 10 timed subtests. The computerized CAT-ASVAB used at Military Entrance Processing Stations is adaptive and takes about 90 minutes; the paper version takes around 3 hours.
- General Science (GS): physical, life, and earth science
- Arithmetic Reasoning (AR): word problems and applied math (AFQT)
- Word Knowledge (WK): vocabulary and synonyms (AFQT)
- Paragraph Comprehension (PC): reading comprehension (AFQT)
- Mathematics Knowledge (MK): algebra and geometry (AFQT)
- Electronics Information (EI): electrical and electronic principles
- Auto Information (AI) and Shop Information (SI): automotive and shop
- Mechanical Comprehension (MC): mechanical and physical principles
- Assembling Objects (AO): spatial reasoning
Only the four bolded subtests (AR, WK, PC, MK) feed the AFQT. The full set of subtests is combined into line scores or composites that each branch uses to qualify recruits for specific military occupational specialties.
AFQT score categories and branch minimums
The AFQT percentile is grouped into categories that the military uses to gauge trainability. Category III is the population average; Categories I and II are above average, and Category V is legally barred from enlisting.
|---|---|---|
Minimum AFQT scores to enlist (for applicants with a high school diploma) are: Army 31, Navy 35, Marine Corps 32, Air Force 36, Coast Guard 36, and Space Force 31. These minimums correspond to an IQ-equivalent of roughly 88 to 92. GED holders and certain enlistment programs often require higher minimums, sometimes 50 or above. Meeting the branch minimum only qualifies you to enlist; specific jobs require higher line scores on the relevant subtests.
How AFQT percentiles map to IQ
Both IQ and the AFQT describe where a person falls on a bell curve, so converting between them is a matter of matching percentile ranks. IQ uses a mean of 100 and a standard deviation of 15, so an IQ of 100 is the 50th percentile, 115 is about the 84th, and 130 is about the 98th. The AFQT is already expressed as a percentile, which makes the mapping direct.
- AFQT 50 (50th percentile) maps to roughly IQ 100
- AFQT 31 (Army minimum) maps to roughly IQ 92
- AFQT 65 maps to roughly IQ 106
- AFQT 93 (Category I) maps to roughly IQ 122
These are statistical equivalences, not interchangeable scores. The AFQT is built primarily from math and verbal items, so it does not capture the full range of abilities a comprehensive IQ test measures, and tail conversions (very high or very low) are less precise because both tests have fewer calibration cases at the extremes.
Frequently asked questions
What is a good ASVAB score?
A good ASVAB score usually refers to a good AFQT percentile. An AFQT of 50 puts you at the population median and qualifies you for every branch. Scores of 65 and above (Category II) are considered strong and open up more job options and enlistment bonuses, while 93 and above (Category I) is the top tier. Because the AFQT is a percentile, your score directly tells you what fraction of test takers you outperformed: an AFQT of 70 means you scored higher than 70 percent of the reference group.
What ASVAB score do I need to join the military?
You need to meet your chosen branch's minimum AFQT percentile. For applicants with a high school diploma the minimums are Army 31, Navy 35, Marine Corps 32, Air Force 36, Coast Guard 36, and Space Force 31. GED holders typically need higher scores, often 50. Meeting the minimum only lets you enlist; qualifying for a specific job requires hitting the line-score requirements built from the other ASVAB subtests.
What IQ does an ASVAB AFQT score equal?
Because the AFQT is a percentile and IQ uses a mean of 100 with a standard deviation of 15, the two can be matched by percentile. An AFQT of 50 corresponds to roughly IQ 100, an AFQT of 31 (the Army minimum) to roughly IQ 92, an AFQT of 65 to about IQ 106, and an AFQT of 93 to about IQ 122. AFQT and IQ correlate at roughly 0.8, but they are not identical measures, so these are statistical equivalents rather than interchangeable scores.
Does the ASVAB measure IQ?
The ASVAB is an aptitude and placement test, not a formal IQ test, but its AFQT composite is a strong proxy for general cognitive ability. The AFQT correlates with standard IQ tests at around 0.8 because it draws heavily on verbal and mathematical reasoning, the same abilities that load on the general intelligence (g) factor. Researchers frequently use the AFQT as an IQ stand-in, but it omits some abilities a full IQ battery covers.
How is the AFQT score calculated from the ASVAB?
The AFQT is computed from four of the ten ASVAB subtests: Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge, and Paragraph Comprehension. The military combines a Verbal Expression score (from Word Knowledge and Paragraph Comprehension) with the two math subtests, then converts that raw composite into a percentile from 1 to 99 against the 1997 nationally representative reference sample of 18-to-23-year-olds. The remaining six subtests do not affect the AFQT but determine job eligibility.
What is the highest ASVAB score you can get?
The highest AFQT percentile is 99, meaning you scored higher than 99 percent of the reference population. The AFQT is reported on a 1-to-99 percentile scale, so there is no score above 99. Individual ASVAB subtests are reported as standard scores with a mean of 50 and a standard deviation of 10, where most scores fall between 30 and 70, but the headline AFQT figure people quote tops out at 99.
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Cite this converter
Editorial content and curation are released under CC BY-SA 4.0. This converter is part of the What's Your IQ educational resources.