American Football
Every american football calculator on CalcEngines — rates and averages, scoring and standings, and plain explanations of the rules behind them, each one naming the governing body and the season its numbers come from.
8 calculators in this section
- American Football Scoring and Two-Point InterpreterWhat each American football score is worth, from which yard line the try is taken, and who is allowed to score on it — under the NFL's rules, the NCAA's and the NFHS's, because the three differ and the NFL's changed in 2015. Every answer names the rule and says where it was read.
- Field Goal Kicking Percentage CalculatorField goal percentage for an American football kicker — kicks made over kicks attempted, split at fifty yards, with the shorter attempts worked out for you. A field goal here is a three-point kick through the uprights, which is not what the phrase means in basketball.
- NCAA Passer Efficiency Rating CalculatorCollege American football's passing efficiency rating — 8.4 per yard, 330 per touchdown, minus 200 per interception and 100 per completion, over attempts. No caps, no ceiling, and a different answer from the NFL's formula on the same line.
- NFL Passer Rating CalculatorAmerican football's four-category passer rating, as the NFL has computed it since 1973 — each of the four capped at 2.375 and floored at nought. The caps are why the maximum is exactly 158.3, and why a quarterback can improve a statistic and not move the rating at all.
- Third Down and Red Zone Conversion CalculatorThe two American football efficiency rates everyone quotes — third down conversion percentage and what a team does once it reaches the red zone. Neither the red zone nor the counting convention behind either rate is defined by any rules body, and the page says so rather than pretending otherwise.
- Total QBR in American Football, ExplainedWhat ESPN's Total QBR is trying to do that American football's passer ratings cannot, what it needs to do it, and why this page computes no QBR figure. The model is unpublished and its inputs are not on a box score, so any number produced here would be a fourth quantity wearing a familiar name.
- Turnover Margin and Differential CalculatorTakeaways minus giveaways for an American football team, with the per-game rate. Turnover margin tracks winning hard — and barely repeats from one season to the next, because a loose ball is close to a coin toss. The page prints both halves of that and converts neither into a prediction.
- Yards Per Attempt and Passing Rates CalculatorThe American football passing rates a box score supports exactly — yards per attempt, adjusted yards per attempt, completion percentage, touchdown and interception percentage, and yards per completion. The adjusted weights are a statistical convention rather than a rule, and one of them has been changed.