The Devils Performance Index is a custom metric designed to evaluate player performance on a game-by-game basis. It uses play-by-play data to capture individual shot attempts (Corsi), expected goals from shot location, and penalties drawn. Physical stats are normalized to per-60-minute rates so that ice time doesn't inflate raw counts. A 5-on-5 bonus rewards even-strength play quality.

Expected goals come from a model fitted on 27,931 shots from 328 games of the 2025-26 season, using shot distance, angle and shot type. Because every public model is built differently, an expected goals figure here should not be compared with one from another site. Scores published before October 2026 used an earlier, miscalibrated model and are not comparable with current ones — the changelog explains what changed and why.

Plus/minus is shown on every player's stat line but no longer affects the rating. Its place is taken by on-ice expected goal differential at 5-on-5, which measures the same thing — a player's effect at both ends while he is on the ice — on the quality of the chances rather than on whether the puck happened to go in.