http://www.primecomputing.com/ (calculator although it doesn't go below zero)

And from wikipedia:

The passer rating is determined by four statistics, each of which are computed as a number between zero and 2.375. The benchmarks for these statistics are based on historical averages. If any of the components are less than zero, they are reckoned as zero; if any are over 2.375, they are reckoned as 2.375.

* The completion percentage rating is calculated as {{COMP over ATT} times 100 - 30 over 20}
* The rating for average yards per attempt is calculated as left( { YDS over ATT } - 3 right) times { 1 over 4 }
* The rating for touchdowns per attempt is calculated as { TD over ATT }times 20
* The rating for interceptions per attempt is calculated as 2.375 - { INT over ATT } times 25

The four results are then added, divided by 6, and multiplied by 100. Since each of these numbers is at most 2.375, the maximum passer rating is

{4 times 2.375 over 6}times 100 = 158.3.

The CFL appears to use the same formula as the NFL.

....Michna was cut....how come he's still listed on the Bombers roster...Ted White never got cut either....i seen him throw up one to the Argos last night ruining their shut-out... :lol: :o