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.
[The bad news for Jets fans is it looks like the team could struggle to score touchdowns again this season. The good news for Folk is that means more field goal attempts. Now back to the bad news: Folk has made fewer than 80% of his kicks for four straight seasons. There are too many other good options for fantasy owners to be starting an inconsistent kicker on a bad offense.]