What this tool is: the official NFL passer rating formula on a live gauge — type a stat line, watch the needle move, and see the four components that build the number. Perfect game: 158.3.
Passer rating is four sub-scores, each clamped between 0 and 2.375: completion % ((comp/att − .3) × 5) · yards per attempt ((Y/A − 3) × .25) · TD rate (TD/att × 20) · INT avoidance (2.375 − INT/att × 25). Sum, divide by 6, multiply by 100. Max all four — at least 77.5% completions, 12.5 Y/A, a TD on 11.875% of throws, zero picks — and you print the famous 158.3.
Reading the gauge honestly
League average lives near 90 in the modern era; 100+ is a strong season, 110+ is MVP conversation, and a game under 70 usually means the offense never showed up. But this is a 1973 formula with real blind spots — no sacks, no rushing, no drops, no game situation — which is why the analytics crowd graduated to EPA per play. The rating is still the number on every broadcast graphic, though, and now you can compute it before the truck does.