Cotton Davidson has the worst career completion percentage, at 43.9 percent.

worst completion percentage in nfl history
Interpreted as:
worst completion percentage with a minimum of 1500 passing attempts by a player in NFL history
DavidsonRoteParilliKempBlandaBrownFloresLaynePhippsWilliamsLamonicaLeBaronConerlyPagelNamathWaterfieldTripuckaHadlNelsenMeredithSchroederMalonePastorini43.945.746.646.747.747.848.949.049.249.549.550.050.150.150.150.350.450.450.650.750.850.950.9
NAMEGPPCTATTCMPYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Cotton DavidsonCotton Davidson11143.91,75277011,7606.7105.9734.21086.254.9
Tobin RoteTobin Rote14945.72,9071,32918,8506.5126.51485.11916.656.8
Babe ParilliBabe Parilli18946.63,3301,55222,6816.8120.01785.32206.60059.6
Jack KempJack Kemp12246.73,0731,43621,2186.9173.91143.71836.02118757.3
George BlandaGeorge Blanda34047.74,0071,91126,9206.779.22365.92776.9129460.6
Ed BrownEd Brown15447.81,98794915,6007.9101.31025.11386.962.8
Tom FloresTom Flores10648.91,71583811,9597.0112.8935.4925.411167.6
Bobby LayneBobby Layne17549.03,7001,81426,7687.2153.01965.32436.663.4
Mike PhippsMike Phipps11949.21,79988610,5065.888.3553.11086.01721,51452.6
Doug WilliamsDoug Williams8849.52,5071,24016,9986.8193.21004.0933.78473469.4
Daryle LamonicaDaryle Lamonica15149.52,6011,28819,1547.4126.81646.31385.37263672.9
Eddie LeBaronEddie LeBaron13450.01,79689813,3997.5100.01045.81417.961.4
Charlie ConerlyCharlie Conerly16150.12,8331,41819,4886.9121.01736.11675.968.2
Mike PagelMike Pagel13250.11,5097569,4146.271.3493.2634.211583763.3
Joe NamathJoe Namath14050.13,7621,88627,6637.4197.61734.62205.81091,05265.5
Bob WaterfieldBob Waterfield9150.31,61781411,8497.3130.2976.01287.961.6
Frank TripuckaFrank Tripucka7550.41,74587910,2825.9137.1694.01247.152.2
John HadlJohn Hadl22450.44,6872,36333,5037.1149.62445.22685.71791,51467.4
Bill NelsenBill Nelsen9050.61,90596314,1657.4157.4985.11015.35049470.2
Don MeredithDon Meredith10450.72,3081,17017,1997.5165.41355.81114.874.8
Jay SchroederJay Schroeder11850.82,8081,42620,0637.1170.01144.11083.82081,60071.7
Mark MaloneMark Malone7350.91,64883910,1756.2139.4603.6814.98667161.9
Dan PastoriniDan Pastorini14050.93,0551,55618,5156.1132.31033.41615.32462,22959.1
Jim HartJim Hart20151.15,0762,59334,6656.8172.52094.12474.92431,93666.6
Frank RyanFrank Ryan12651.12,1331,09016,0427.5127.31497.01115.243577.6
StatMuse has season-level data for completion percentage and passing attempts going back to the 1932 season.

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