The ASVAB raw score is calculated by adding the word knowledge score twice, the paragraph comprehension score twice, the arithmetic reasoning score and the mathematics knowledge score all together. This raw score is weighted to determine the percentile score.
The highest raw score for the ASVAB is 320. Any raw score above 254 is in the 99th percentile group. This means that only 1 percent of people tested have a higher score. A score of 80 to 120 is considered to be the lowest possible score. Each of the 200 questions are scored and weighted differently. The average score is between 200 and 240.