Attack delay, also known as attack speed offset, is the hidden variable that is used to calculate a champion's "base attack speed." The formula for this calculation is as follows:

A negative attack delay corresponds to a higher base attack speed (i.e. attacks per second), which consequently makes bonus attack speed more effective.

Contrary to popular believe, attack delay is not responsible for how "good" an attack feels. A number of other hidden variables are used to determine when an attack wind-up is considered complete as well as when an attack is considered to have hit - e.g. some projectile-based attackers can click to move the moment the projectile is airborne, whereas others may "cancel" the attack at any point prior to the projectile hitting. These variables is not viewable/accessible.

Champion Attack delay Calculated base attack speed
Decimal
(mouseover for expansion)
Precise
fraction
Aatrox Aatrox−0.040.6510.625 ÷ 0.96
Ahri Ahri−0.0650.6680.625 ÷ 0.935
Akali Akali−0.10.6940.625 ÷ 0.9
Alistar Alistar00.6250.625 ÷ 1
Amumu Amumu−0.020.6380.625 ÷ 0.98
Anivia Anivia00.6250.625 ÷ 1
Annie Annie0.080.5790.625 ÷ 1.08
Ashe Ashe−0.050.6580.625 ÷ 0.95
Aurelion Sol Aurelion Sol00.6250.625 ÷ 1
Azir Azir00.6250.625 ÷ 1
Bard Bard00.6250.625 ÷ 1
Blitzcrank Blitzcrank00.6250.625 ÷ 1
Brand Brand00.6250.625 ÷ 1
Braum Braum−0.030.6440.625 ÷ 0.97
Caitlyn Caitlyn0.10.5680.625 ÷ 1.1
Camille Camille−0.030.6440.625 ÷ 0.97
Cassiopeia Cassiopeia−0.0340.6470.625 ÷ 0.966
Cho'Gath Cho'Gath00.6250.625 ÷ 1
Corki Corki−0.020.6380.625 ÷ 0.98
Darius Darius00.6250.625 ÷ 1
Diana Diana00.6250.625 ÷ 1
Dr. Mundo Dr. Mundo00.6250.625 ÷ 1
Draven Draven−0.079370.6790.625 ÷ 0.92063
Ekko Ekko00.6250.625 ÷ 1
Elise Elise00.6250.625 ÷ 1
Evelynn Evelynn−0.06250.6670.625 ÷ 0.9375
Ezreal Ezreal00.6250.625 ÷ 1
Fiddlesticks Fiddlesticks00.6250.625 ÷ 1
Fiora Fiora00.6250.625 ÷ 1
Fizz Fizz−0.050.6580.625 ÷ 0.95
Galio Galio00.6250.625 ÷ 1
Gangplank Gangplank00.6250.625 ÷ 1
Garen Garen00.6250.625 ÷ 1
Gnar Gnar00.6250.625 ÷ 1
Gragas Gragas00.6250.625 ÷ 1
Graves Graves0.30.4810.625 ÷ 1.3
Hecarim Hecarim−0.06720.670.625 ÷ 0.9328
Heimerdinger Heimerdinger00.6250.625 ÷ 1
Illaoi Illaoi0.093760.5710.625 ÷ 1.09376
Irelia Irelia−0.060.6650.625 ÷ 0.94
Ivern Ivern−0.030.6440.625 ÷ 0.97
Janna Janna00.6250.625 ÷ 1
Jarvan IV Jarvan IV−0.050.6580.625 ÷ 0.95
Jax Jax−0.020.6380.625 ÷ 0.98
Jayce Jayce−0.050.6580.625 ÷ 0.95
Jhin Jhin00.6250.625 ÷ 1
Jinx Jinx00.6250.625 ÷ 1
Kai'Sa Kai'Sa−0.020.6380.625 ÷ 0.98
Kalista Kalista−0.030.6440.625 ÷ 0.97
Karma Karma00.6250.625 ÷ 1
Karthus Karthus00.6250.625 ÷ 1
Kassadin Kassadin−0.0230.640.625 ÷ 0.977
Katarina Katarina−0.050.6580.625 ÷ 0.95
Kayle Kayle−0.020.6380.625 ÷ 0.98
Kayn Kayn00.6250.625 ÷ 1
Kennen Kennen−0.09470.690.625 ÷ 0.9053
Kha'Zix Kha'Zix−0.0650.6680.625 ÷ 0.935
Kindred Kindred00.6250.625 ÷ 1
Kled Kled00.6250.625 ÷ 1
Kog'Maw Kog'Maw−0.060.6650.625 ÷ 0.94
LeBlanc LeBlanc00.6250.625 ÷ 1
Lee Sin Lee Sin−0.040.6510.625 ÷ 0.96
Leona Leona00.6250.625 ÷ 1
Lissandra Lissandra00.6250.625 ÷ 1
Lucian Lucian−0.020.6380.625 ÷ 0.98
Lulu Lulu00.6250.625 ÷ 1
Lux Lux00.6250.625 ÷ 1
Malphite Malphite−0.020.6380.625 ÷ 0.98
Malzahar Malzahar00.6250.625 ÷ 1
Maokai Maokai−0.10.6940.625 ÷ 0.9
Master Yi Master Yi−0.080.6790.625 ÷ 0.92
Miss Fortune Miss Fortune−0.04730.6560.625 ÷ 0.9527
Mordekaiser Mordekaiser0.040.6010.625 ÷ 1.04
Morgana Morgana00.6250.625 ÷ 1
Nami Nami−0.030.6440.625 ÷ 0.97
Nasus Nasus−0.020.6380.625 ÷ 0.98
Nautilus Nautilus0.020.6130.625 ÷ 1.02
Nidalee Nidalee−0.020.6380.625 ÷ 0.98
Nocturne Nocturne−0.0650.6680.625 ÷ 0.935
Nunu Nunu00.6250.625 ÷ 1
Olaf Olaf−0.10.6940.625 ÷ 0.9
Orianna Orianna−0.050.6580.625 ÷ 0.95
Ornn Ornn−0.080.6790.625 ÷ 0.92
Pantheon Pantheon−0.030.6440.625 ÷ 0.97
Poppy Poppy00.6250.625 ÷ 1
Quinn Quinn−0.0650.6680.625 ÷ 0.935
Rakan Rakan00.6250.625 ÷ 1
Rammus Rammus00.6250.625 ÷ 1
Rek'Sai Rek'Sai00.6250.625 ÷ 1
Renekton Renekton−0.060.6650.625 ÷ 0.94
Rengar Rengar00.6250.625 ÷ 1
Riven Riven00.6250.625 ÷ 1
Rumble Rumble−0.030.6440.625 ÷ 0.97
Ryze Ryze00.6250.625 ÷ 1
Sejuani Sejuani00.6250.625 ÷ 1
Shaco Shaco−0.10.6940.625 ÷ 0.9
Shen Shen00.6250.625 ÷ 1
Shyvana Shyvana−0.050.6580.625 ÷ 0.95
Singed Singed0.020.6130.625 ÷ 1.02
Sion Sion−0.080.6790.625 ÷ 0.92
Sivir Sivir00.6250.625 ÷ 1
Skarner Skarner00.6250.625 ÷ 1
Sona Sona−0.030.6440.625 ÷ 0.97
Soraka Soraka00.6250.625 ÷ 1
Swain Swain00.6250.625 ÷ 1
Syndra Syndra00.6250.625 ÷ 1
Tahm Kench Tahm Kench00.6250.625 ÷ 1
Taliyah Taliyah00.6250.625 ÷ 1
Talon Talon−0.0650.6680.625 ÷ 0.935
Taric Taric00.6250.625 ÷ 1
Teemo Teemo−0.09470.690.625 ÷ 0.9053
Thresh Thresh00.6250.625 ÷ 1
Tristana Tristana−0.04730.6560.625 ÷ 0.9527
Trundle Trundle−0.06720.670.625 ÷ 0.9328
Tryndamere Tryndamere−0.06720.670.625 ÷ 0.9328
Twisted Fate Twisted Fate−0.040.6510.625 ÷ 0.96
Twitch Twitch−0.080.6790.625 ÷ 0.92
Udyr Udyr−0.050.6580.625 ÷ 0.95
Urgot Urgot0.050.5950.625 ÷ 1.05
Varus Varus−0.050.6580.625 ÷ 0.95
Vayne Vayne−0.050.6580.625 ÷ 0.95
Veigar Veigar00.6250.625 ÷ 1
Vel'Koz Vel'Koz00.6250.625 ÷ 1
Vi Vi00.6250.625 ÷ 1
Viktor Viktor−0.050.6580.625 ÷ 0.95
Vladimir Vladimir−0.050.6580.625 ÷ 0.95
Volibear Volibear−0.050.6580.625 ÷ 0.95
Warwick Warwick−0.020.6380.625 ÷ 0.98
Wukong Wukong−0.050.6580.625 ÷ 0.95
Xayah Xayah00.6250.625 ÷ 1
Xerath Xerath00.6250.625 ÷ 1
Xin Zhao Xin Zhao00.6250.625 ÷ 1
Yasuo Yasuo−0.0670.670.625 ÷ 0.933
Yorick Yorick00.6250.625 ÷ 1
Zac Zac−0.020.6380.625 ÷ 0.98
Zed Zed−0.040.6510.625 ÷ 0.96
Ziggs Ziggs−0.04730.6560.625 ÷ 0.9527
Zilean Zilean00.6250.625 ÷ 1
Zoe Zoe00.6250.625 ÷ 1
Zyra Zyra00.6250.625 ÷ 1
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