Strength of schedule is calculated from the opponents projected fantasy points allowed for the PK position. The best rating is +16 which gives the player the advantage against the defense and indicates an easy opponent, the worst rating is -16 which gives the defense the advantage and indicates a tough opponent.
[Zuerlein was given the nickname "Legatron" in his first season with the Rams. That will happen when you make a 60 yard field goal in a game, two 58 yard field goals in another game and have 13 attempts of 50+ yards for the season as a rookie. The Rams upgraded their offense in the draft and if they give Zuerlein a few more chances from within 50 yards, he has the leg to become a fantasy stud.]