The following conversion table provided by the College Board and the ACT provides the best possible estimated comparison of the two standardized test scores. 

• The Composite ACT plus Writing score includes four subscores (Reading, English, Math and Science) and a Writing subscore. ACT test scores and the Composite score range from 1 to 36; subscores range from 1 to 18. The Composite score is the average of the four subject area tests' scores. However, subscores do not necessarily add up to the score for a subject area test. 
• The total SAT total is the sum of the three separate test scores for Critical Reading, Writing, and Mathematics.