Line scores are the composites each branch builds from your ASVAB subtests, and they decide which job you can hold. In the guides we publish here, we keep pulling readers back to this distinction. The AFQT decides whether a branch may enlist you at all. Line scores decide what you do once they have.
Two recruits can walk out of the same testing session with an identical AFQT and qualify for entirely different job lists. The six subtests that sit outside the AFQT are the reason.
How a Line Score Is Built
Each branch takes the ten subtest standard scores from your ASVAB and adds selected ones together into named composites. A composite aimed at electronics work draws on Electronics Information, Arithmetic Reasoning, General Science and Mathematics Knowledge. A composite aimed at clerical work draws on the verbal and math subtests instead.
Because composites reuse subtests, one weak area spreads. A low Arithmetic Reasoning score pulls down several Army composites at once, since that subtest feeds many of them. A low Auto Information score is contained, because it feeds fewer.
Line scores are not percentiles. They are reported on a different scale from the AFQT, and they routinely run above 100. A GT of 110 is not the 110th percentile of anything, and confusing the two scales is the most common misreading of a score sheet.
If the difference between the AFQT and these composites is still fuzzy, our AFQT and ASVAB comparison works through it.
The Army Composites
The Army uses ten composites, and every enlisted job is written against one or more of them.
- GT, General Technical, gates officer programs, warrant officer flight training, and much of the intelligence field.
- ST, Skilled Technical, is the other composite worth knowing by name, because it runs the linguist, intelligence analysis and medical jobs.
- CL, Clerical, covers administrative, personnel and finance roles.
- CO, Combat, is written against infantry, armor and combat engineering.
- EL, Electronics, gates electronic and avionics maintenance.
- FA, Field Artillery, covers fire support.
- GM, General Maintenance, covers utility and general repair work.
- MM, Mechanical Maintenance, runs vehicle and heavy equipment repair, which is one of the largest job families in the Army.
- OF, Operators and Food, covers transport and food service.
- SC, Surveillance and Communications, gates signal and radar.
Which subtests feed each of those is a harder question to answer straight. The Army's public ASVAB page does not publish the formulas. It does not mention GT at all. The formulas sit in Army Regulation 601-210 and in recruiting manuals that are not readily reachable online.
Prep sites fill that vacuum with confident formulas that disagree with one another. Even the widely repeated version of the GT formula appears in two different forms across those sites. We are not going to print one and call it official. Bring your score sheet to an Army job counselor and have the composite computed from it.
The Air Force MAGE Composites
The Air Force uses four composites rather than ten, known together as MAGE, and it does publish which subtests feed each one. The Air Force ASVAB page lists them.
| Composite | Subtests that feed it |
|---|---|
| Mechanical | Arithmetic Reasoning, Auto and Shop, Mechanical Comprehension, Paragraph Comprehension, Word Knowledge |
| Administrative | Mathematics Knowledge, Paragraph Comprehension, Word Knowledge |
| General | Arithmetic Reasoning, Paragraph Comprehension, Word Knowledge |
| Electronical | Arithmetic Reasoning, Electronics Information, General Science, Mathematics Knowledge |
The weighting is a separate matter. The Air Force publishes the ingredients and withholds the recipe, so a site printing a weighted MAGE formula is going beyond what the branch has said. One further trap sits in the abbreviation. In the Mechanical composite, AS means Auto and Shop, and at least one prep site reads it as Assembling Objects, which is a different subtest entirely.
The Other Branches
The Marine Corps uses a shorter composite set that includes GT, EL, MM and CL, and Marine job requirements are written against those. The Navy takes a different approach again. It builds a line score per rating from a specific sum of subtests, so a nuclear field applicant and a hospital corpsman applicant are measured on different combinations. The Coast Guard and the Space Force publish requirements job by job rather than through a named composite set.
The practical effect is that a line score does not travel between branches. A GT of 115 means something to an Army counselor and nothing to a Navy classifier, even though the underlying subtest scores are identical.
Where a Weak Subtest Closes a Job Family
Applicants prepare for the AFQT because it is the number that decides eligibility, and then discover the job list is thinner than expected. We see that pattern more often than any other.
Consider a recruit who does well on the verbal and math subtests and badly on Electronics Information, General Science and Mechanical Comprehension. Their AFQT comes out strong. Their Electronics and General Maintenance composites do not, which closes the technical maintenance jobs, several intelligence roles, and most of the aviation maintenance field. None of that shows up in the AFQT number they spent months preparing for.
The fix is to know which composite your target job runs on before you test, and to prepare the subtests that feed it. Our guide to ASVAB scores by job covers how each branch expresses those requirements.
Raising a Line Score Means Retaking Everything
You cannot retest a single composite. The ASVAB is scored as one battery, so improving your Electronics composite means sitting all ten subtests again and accepting whatever comes back across every composite.
That risk is real rather than theoretical. A recruit who retests to raise Electronics Information can have a worse day on Word Knowledge and walk out with a lower General Technical composite than they started with. The new sheet replaces the old one either way.
Members already serving take the Armed Forces Classification Test rather than the ASVAB, and it works the same way. Same battery, same all-or-nothing result, taken through a base education office instead of a recruiting station. Our page on retaking the ASVAB covers the waiting periods and the confirmation test rule that catches large score jumps.
So decide what you are optimising for before you book a retest. Chasing one composite while a job offer sits on the table has cost applicants the offer.
Who Should Not Worry About Line Scores
If you are undecided about a branch or a career field, chasing a specific composite is premature. Take the test, get the sheet, and let the composites tell you which fields are open. Working backwards from a real score sheet beats guessing at a target.
The applicant who should care is the one with a named job in mind, especially in the technical, intelligence, aviation or medical fields. Those requirements sit well above enlistment minimums, and a composite that misses by two points closes the job as firmly as one that misses by twenty.
What Would Change This Answer
If the Army published its composite formulas on a public page, the guidance here would change from asking a counselor to computing it yourself. The same goes for the Air Force releasing the MAGE weightings. Until either happens, any exact formula you find online is a reconstruction, however confidently it is presented.
Our page on the GT score covers the composite that gates the most doors. Ask your recruiter which composite your target job is scored on, then work backwards to the subtests that feed it.