NFL Passer Rating Calculator

NFL Passer Rating Calculator

The NFL passer rating is a single number that summarises a quarterback’s passing efficiency using just five box-score stats. This calculator implements the exact official formula the NFL has used since 1973, computing each of the four weighted components and combining them into a final rating between 0 and 158.3.

How it works

The rating is built from four components, each measuring a different aspect of passing efficiency, where ATT is attempts:

a = ((Completions / ATT) - 0.3) * 5
b = ((Yards / ATT) - 3) * 0.25
c = (Touchdowns / ATT) * 20
d = 2.375 - ((Interceptions / ATT) * 25)

Each of a, b, c, and d is clamped so it cannot fall below 0 or rise above 2.375. The four clamped values are then summed and scaled:

Passer Rating = ((a + b + c + d) / 6) * 100

Because each component maxes out at 2.375, the sum maxes at 9.5, and (9.5 / 6) * 100 = 158.33, which is why a perfect game caps at 158.3.

Worked example

For a line of 25 completions on 35 attempts, 310 yards, 3 TDs, and 1 INT:

• Completion rate is 0.714: a = (0.714 - 0.3) × 5 = 2.071
• Yards per attempt is 8.857: b = (8.857 - 3) × 0.25 = 1.464
• TD rate: c = (3 / 35) × 20 = 1.714
• INT rate: d = 2.375 − (1/35 × 25) = 1.661
• Sum: 2.071 + 1.464 + 1.714 + 1.661 = 6.910
• Rating: (6.910 / 6) × 100 ≈ 115.2

A rating of 115 is comfortably above average and represents a solid, efficient game.

What the four components actually measure

The formula was designed in 1971 by a committee studying the 1960–1970 seasons and calibrated so that average performance would produce a rating near 66.7 (the theoretical midpoint of the original scale, later revised so the average sits closer to 85–90 in the modern era):

• Component a (completion percentage) — measures ball-catching efficiency. It is set up so that a 30% completion rate produces 0 and roughly a 77.5% completion rate hits the cap. Average seasons typically sit in the 60–70% range.
• Component b (yards per attempt) — rewards big plays. A YPA of 3 produces 0; a YPA near 12.5 hits the cap. League averages tend to be in the 7–8 YPA range.
• Component c (TD rate) — rewards touchdowns per attempt. Zero TDs gives 0; roughly 11.9% TD rate hits the cap. Elite seasons run at 6–9% TD rates.
• Component d (interception rate) — uniquely, this component starts at its maximum (2.375 for zero interceptions) and decreases with each pick. A 9.5% interception rate floors it at 0. It is the only component where doing nothing is perfect — a zero-interception game automatically earns the maximum on this component.

What passer rating does not measure

The traditional NFL passer rating has known limitations and is best understood alongside other metrics:

• No rushing yards or TDs — mobile quarterbacks who score on the ground or gain significant rushing yardage receive no credit.
• No sacks or sack yards — a quarterback who takes 7 sacks but avoids interceptions can still post a high passer rating.
• No game context — a 4th-quarter game-winning drive rates identically to a garbage-time performance with the same stat line.
• No dropped INTs — a ball that hits a cornerback’s hands and is dropped counts as an incomplete pass, even if it was a badly thrown ball.

For a fuller picture, analysts often use Total QBR (ESPN), EPA per play (expected points added), or CPOE (completion percentage over expectation) alongside the traditional passer rating.

Passer rating benchmarks

Tips: passer rating rewards avoiding interceptions heavily, since the d component starts at its maximum and only decreases. The metric ignores rushing, sacks, and game context, so pair it with Total QBR or EPA for a fuller picture of quarterback play.