Brock Purdy

QB San Francisco 49ers · Wk 3 vs ARI ARI

Chance of 2+ passing TDs

65%

Rank

of 34

Why Purdy ranks #6

Brock Purdy has reached 2+ passing TDs in 2 of 2 games this season.
Purdy has 5 passing TDs in 2 games (2.50 per game) on 28.0 pass attempts per game. With a small sample, that is blended with what a typical QB at this workload produces (1.39 per game), giving 1.84 per game.
The Cardinals have allowed 2.00 passing TDs per game to QBs over 2 games, versus a league average of 1.56 (+28%). Only 33% of that gap is applied because the sample is small, a x1.09 adjustment.
Game environment (passing TDs x1.09): Vegas total 47.5, implied 28.0 points for SF (league avg 22.5); Favored by 8.5: leaning run-heavy late; Wind about 12 mph: hurts passing and kicking.
Expected passing TDs this week: 2.24. That makes the chance of 2+ passing TDs 65%.
Small sample: only 2 games so far, so treat this as directional.

How the math works

Rate: (actual total + 3 games of the typical rate) divided by (games played + 3). This keeps one or two games from swinging the estimate.

Matchup: the opponent's allowed rate to QBs divided by the league average, with only n/(n+4) of the gap applied and limited to x0.7 to x1.4.

Chance: expected 2.24, converted with a Poisson count model to the chance of 2+.

It does not know about injuries, snap counts, game script or weather.

Totals are for every QB the Cardinals faced in each game, not just one player.