The ASVAB produces two kinds of score, and they answer different questions. The AFQT decides whether you can enlist; line scores decide which jobs you qualify for. These tools compute both from the standard scores printed on your score sheet, using the official Department of Defense formulas and conversion table.
The AFQT is AR + MK + 2 × VE on standard scores, where VE is the Verbal Expression composite built from Word Knowledge and Paragraph Comprehension. The resulting composite is converted to a percentile from 1 to 99 using the official 1997 conversion table. Note that VE is not simply Word Knowledge plus Paragraph Comprehension — that was the 1980 definition, and it is still repeated almost everywhere.
Both tools take standard scores rather than a count of correct answers, and that is a deliberate constraint. The computer version of the ASVAB is adaptive and scored with item response theory, so a score means the same thing regardless of which items you saw and no fixed number-correct conversion exists. Your standard scores are on your score sheet; any tool promising an AFQT from a practice-test raw score has invented the missing step.
Considering a service academy or ROTC?
West Point, the Naval Academy, the Air Force Academy and ROTC scholarships all take an SAT or ACT score, not the ASVAB. Our SAT course covers Reading & Writing and Math in full.