Pete Beathard had the worst passer rating by a quarterback when playing 100+ games, with a 49.9 rating.

worst passer rating in 100 games played by a qb
Interpreted as:
worst passer rating in 100 or more games played by a qb
BeathardMcHanPhippsBratkowskiDavidsonRoteKempPastoriniParilliBlandaDetmerRutledgeLeBaronBrownPedersonEvansPagelLayneNamathSneadLeeDilsConerly49.950.352.654.354.956.857.359.159.860.861.261.461.461.662.363.063.363.465.565.565.665.866.4
NAMEGPRATECMPATTPCTYDSAVGYDS/GTDTD%INTINT%SCKSCKY
Pete BeathardPete Beathard11049.95751,28244.98,1766.474.3433.4846.641353
Lamar McHanLamar McHan11350.36101,44242.39,4496.683.6735.11087.5
Mike PhippsMike Phipps11952.68861,79949.210,5065.888.3553.11086.01721,514
Zeke BratkowskiZeke Bratkowski13254.37621,48451.310,3457.078.4654.41228.2112
Cotton DavidsonCotton Davidson11154.97701,75243.911,7606.7105.9734.21086.2
Tobin RoteTobin Rote14956.81,3292,90745.718,8506.5126.51485.11916.6
Jack KempJack Kemp12257.31,4363,07346.721,2186.9173.91143.71836.021187
Dan PastoriniDan Pastorini14059.11,5563,05550.918,5156.1132.31033.41615.32462,229
Babe ParilliBabe Parilli17759.81,4753,15346.821,2656.7120.11655.22036.400
George BlandaGeorge Blanda18060.81,7503,65347.924,6226.7136.82085.72486.8
Koy DetmerKoy Detmer10361.218435452.01,9445.518.9102.8144.01277
Jeff RutledgeJeff Rutledge11761.427452652.13,6286.931.0163.0295.552404
Eddie LeBaronEddie LeBaron13461.48981,79650.013,3997.5100.01045.81417.9
Ed BrownEd Brown12861.68961,88647.514,5917.7114.0945.01316.9
Doug PedersonDoug Pederson10062.328652254.82,7625.327.6122.3193.640244
Vince EvansVince Evans10063.07041,39050.69,4856.894.9523.7745.3118895
Mike PagelMike Pagel13263.37561,50950.19,4146.271.3493.2634.2115837
Bobby LayneBobby Layne17563.41,8143,70049.026,7687.2153.01965.32436.6
Joe NamathJoe Namath14065.51,8863,76250.127,6637.4197.61734.62205.81091,052
Norm SneadNorm Snead17865.52,2764,35352.330,7977.1173.01964.52575.994744
Jacky LeeJacky Lee10065.643083851.36,1917.461.9465.5576.8238
Steve DilsSteve Dils10665.850497251.95,8166.054.9272.8323.380575
Charlie ConerlyCharlie Conerly14966.41,2562,53449.617,3136.8116.21516.01546.1
Jim HartJim Hart20166.62,5935,07651.134,6656.8172.52094.12474.92431,936
Rudy BukichRudy Bukich10366.66261,19052.68,4337.181.9615.1746.2
StatMuse has season-level data for passer rating going back to the 1932 season.

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