About this tool
The QB Passer Rating Calculator computes a quarterback's rating from a passing line — completions, attempts, yards, touchdowns and interceptions — using either the NFL or the NCAA standard, which you select with a toggle. The two systems weight the same inputs differently and land on very different scales, so picking the right one matters.
The NFL formula builds four components: a = ((Comp/Att) − 0.3) × 5, b = ((Yds/Att) − 3) × 0.25, c = (TD/Att) × 20, and d = 2.375 − ((INT/Att) × 35). Each component is clamped to the range 0 to 2.375, then Rating = ((a + b + c + d) / 6) × 100, which caps a perfect passer rating at 158.3. The NCAA (college) formula is uncapped: Rating = (8.4·Yds + 330·TD + 100·Comp − 200·INT) / Att, so elite college lines can exceed 200.
All math runs locally in your browser, keeping your inputs private. The tool shows the rating to one decimal place and, in NFL mode, also displays each of the four clamped components so you can see exactly how completion rate, yards per attempt, touchdown rate and interception rate contributed. Completion percentage and yards per attempt are reported in both modes for quick context.