Deshaun Watson has the best career completion percentage by a quarterback, at 67.8 percent.

highest completion percentage by quarterback with at least 20 completionz
Interpreted as:
highest completion percentage with a minimum of 1500 passing attempts by quarterback with at least 20 completionz
WatsonBreesCousinsBridgewaterPenningtonMahomesPrescottWarnerRyanManningRomoRodgersWilsonRiversCarrRoethlisbergerYoungSchaubTrubiskyBradyTannehillGoffMontana67.867.767.066.566.066.066.065.565.465.365.365.165.164.964.464.464.364.264.064.063.863.463.2
NAMEGPPCTATTCMPYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Deshaun WatsonDeshaun Watson5467.81,7481,18614,5398.3269.21045.9362.11741,050104.5
Drew BreesDrew Brees28767.710,5517,14280,3587.6280.05715.42432.34202,99198.7
Kirk CousinsKirk Cousins10967.03,6622,45328,3727.7260.31905.2842.32131,57197.9
Teddy BridgewaterTeddy Bridgewater5966.51,5621,03811,3857.3193.0533.4362.312885889.5
Chad PenningtonChad Pennington8966.02,4711,63217,8237.2200.31024.1642.616296590.1
Patrick MahomesPatrick Mahomes4666.01,6871,11414,1528.4307.71146.8241.467460108.7
Dak PrescottDak Prescott6966.02,2931,51417,6347.7255.61064.6401.714689297.3
Kurt WarnerKurt Warner12465.54,0702,66632,3447.9260.82085.11283.12601,66993.7
Matt RyanMatt Ryan20565.47,4434,86755,7677.5272.03474.71582.14102,70694.5
Peyton ManningPeyton Manning26665.39,3806,12571,9407.7270.55395.72512.73031,95396.5
Tony RomoTony Romo15665.34,3352,82934,1837.9219.12485.71172.72481,67297.1
Aaron RodgersAaron Rodgers19765.16,5874,28551,2457.8260.14126.3891.44683,150103.9
Russell WilsonRussell Wilson14465.14,3352,82033,9467.8235.72676.2811.93942,572101.7
Philip RiversPhilip Rivers24464.98,1345,27763,4407.8260.04215.22092.64652,84295.2
Derek CarrDerek Carr11064.43,8302,46826,8967.0244.51704.4711.91971,19292.1
Ben RoethlisbergerBen Roethlisberger23364.47,8385,05060,3487.7259.03965.12012.65163,43894.0
Steve YoungSteve Young16964.34,1492,66733,1248.0196.02325.61072.63582,05596.8
Matt SchaubMatt Schaub15564.23,3482,14825,4677.6164.31364.1912.71801,24589.5
Mitchell TrubiskyMitchell Trubisky5164.01,5771,01010,6096.7208.0644.1372.311169887.2
Tom BradyTom Brady30164.010,5986,77879,2047.5263.15815.51911.85213,27297.3
Ryan TannehillRyan Tannehill11663.83,6782,34526,9957.3232.71784.8882.43032,27092.0
Jared GoffJared Goff6963.42,4211,53618,1717.5263.31074.4552.312994891.5
Joe MontanaJoe Montana19263.25,3913,40940,5517.5211.22735.11392.63132,09592.3
Daunte CulpepperDaunte Culpepper10563.03,1992,01624,1537.6230.01494.71063.32981,69687.8
Marcus MariotaMarcus Mariota6462.91,7931,12713,4337.5209.9774.3452.515599289.5
StatMuse has season-level data for completion percentage and passing attempts going back to the 1932 season.

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