Passer Rating vs. QBR: Two Ways to Score a Quarterback

Two Numbers, Two Philosophies

Ask for a single number that captures a quarterback's day and you will get one of two answers: the traditional passer rating (the one capped at a famous 158.3) or ESPN's Total QBR (a 0-100 figure). They look similar on a broadcast graphic, but they come from completely different eras and philosophies. One is a fixed 1970s formula; the other is a modern, play-by-play model. Knowing how each is built tells you when to trust which.

One-line distinction: Passer rating scores the box-score line of a passer. Total QBR tries to score the quarterback's contribution to winning, across every play type.

The Traditional Passer Rating

The NFL passer rating is built from just four inputs, all drawn from the passing line:

Completion %

COMP / ATT

Yards / attempt

YDS / ATT

TD %

TD / ATT

INT %

INT / ATT

Each of the four is converted to a capped sub-score between 0 and 2.375. The caps are what stop a single absurd game from producing an infinite rating. The four sub-scores are then summed and rescaled so the maximum possible value is 158.3 (a "perfect" rating) and an entirely empty, average-ish line lands far lower. The standard form is:

$$ \text{Rating} = \left(\frac{a+b+c+d}{6}\right)\times 100 $$

where each component is computed and then capped to the 0-2.375 range:

$$ a = \frac{\text{COMP}/\text{ATT} - 0.3}{0.2}, \quad b = \frac{\text{YDS}/\text{ATT} - 3}{4} $$ $$ c = \frac{\text{TD}/\text{ATT}}{0.05}, \quad d = 2.375 - \frac{\text{INT}/\text{ATT}}{0.04} $$

Reference points: the maximum is 158.3. To hit it, a passer must reach the cap on all four components at once (very high completion rate, high yards per attempt, a high touchdown rate, and zero interceptions). A perfectly mediocre line sits far down the scale, which is why ratings around the mid-60s read as roughly average-ish rather than "halfway to perfect."

Why Passer Rating Falls Short

It ignores sacks

Sacks never enter the formula. A quarterback who holds the ball forever and takes drive-killing sacks is invisible to passer rating, even though those plays clearly hurt the offense.

It ignores rushing

A scramble for a first down or a designed quarterback run does nothing for passer rating. For mobile quarterbacks, a real part of their value is simply missing.

It's era-inflated

The constants were set in 1973. Modern passing offenses post much higher completion rates and yardage, so today's ratings are systematically higher and hard to compare across eras.

The caps are arbitrary

The 0-2.375 caps and the 158.3 ceiling are conveniences, not anything derived from how football actually produces points. Two very different games can share a rating.

ESPN's Total QBR

Total QBR was ESPN's answer to those weaknesses. Instead of a fixed formula over four box-score stats, it is a model built on play-by-play data and reported on an intuitive 0-100 scale. Its design goals:

Feature	What it adds
Built on EPA	Plays are valued by their expected-points impact, not by a 1970s yardage table.
Every play type	Passes, runs/scrambles, sacks, penalties, and fumbles all count toward the quarterback's number.
Division of credit	Credit for a play is shared - a yards-after-catch screen gives the receiver more of the credit; an on-target deep ball gives the quarterback more.
Clutch weighting	Plays in higher-leverage game situations carry more weight than garbage-time snaps.
Opponent adjustment	Performance is adjusted for the quality of the defense faced.

Reading the scale: on the 0-100 QBR scale, 50 is meant to represent roughly average play, with elite quarterback seasons landing well above that. Because higher-leverage and opponent context are baked in, QBR can diverge from passer rating in exactly the situations passer rating handles worst.

An Illustrative Example

Hypothetical: the same passing line, two different games

Invented to illustrate why the metrics diverge - not real game data.

QB in Game 1

Clean passing line, strong passer rating
But took several bad sacks and lost a fumble
Most production came late in a blowout
QBR would be dragged down

QB in Game 2

Same passing line, same passer rating
Added 40 rushing yards and avoided sacks
Best plays came on game-deciding drives
QBR would be boosted

Passer rating calls these two games identical. QBR sees a fumble, sacks, rushing value, and game leverage that passer rating cannot. Neither is "wrong" - they are measuring different things.

When to Use Which

Reach for passer rating when...

You want a quick, universally available pocket-passing summary.
You only have a box score.
You are comparing pure passing lines and accept its blind spots.

Reach for QBR when...

You want total contribution, including runs and sacks.
You care about game context and opponent.
You are evaluating mobile quarterbacks fairly.

Caveat on QBR: its sophistication is also its cost. The credit-division and clutch weights are ESPN's modeling choices and are not fully transparent, so reasonable people debate them. Treat it as a strong, opinionated model - not gospel - and cross-check with open metrics like EPA and CPOE.

The bottom line

Passer rating is a fixed 1973 formula over four capped box-score components, scaled so 158.3 is perfect; it is simple and universal but ignores sacks and rushing, is era-inflated, and uses arbitrary caps. Total QBR is a modern 0-100 model built on EPA that includes every play type, divides credit among players, weights for leverage, and adjusts for opponent - richer, but proprietary and debatable. Use passer rating for a fast box-score read of a pocket passer, and QBR when you want total, context-aware contribution.