The College Board plans to assign an adversity score to every student who takes the SAT to try to capture their social and economic background, jumping into the debate raging over race and class in college admissions.

This new number, called an adversity score by college admissions officers, is calculated using 15 factors including the crime rate and poverty levels from the student’s high school and neighborhood. Students won’t be told the scores, but colleges will see the numbers when reviewing their applications.

Fifty...