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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:

$\pagecolor{Black}\color{White}{\it AS}_{\rm base}={0.625 \over 1+{\it attack\ delay}}$

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
−0.040.6510.625 ÷ 0.96
−0.0650.6680.625 ÷ 0.935
−0.10.6940.625 ÷ 0.9
00.6250.625 ÷ 1
−0.020.6380.625 ÷ 0.98
00.6250.625 ÷ 1
0.080.5790.625 ÷ 1.08
−0.050.6580.625 ÷ 0.95
00.6250.625 ÷ 1
−0.020.6380.625 ÷ 0.98
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.030.6440.625 ÷ 0.97
0.10.5680.625 ÷ 1.1
00.6250.625 ÷ 1
−0.0340.6470.625 ÷ 0.966
00.6250.625 ÷ 1
−0.020.6380.625 ÷ 0.98
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.080.6790.625 ÷ 0.92
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.050.6580.625 ÷ 0.95
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
0.30.4810.625 ÷ 1.3
−0.06720.670.625 ÷ 0.9328
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.060.6650.625 ÷ 0.94
−0.030.6440.625 ÷ 0.97
00.6250.625 ÷ 1
−0.050.6580.625 ÷ 0.95
−0.020.6380.625 ÷ 0.98
−0.050.6580.625 ÷ 0.95
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.030.6440.625 ÷ 0.97
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.0230.640.625 ÷ 0.977
−0.050.6580.625 ÷ 0.95
−0.020.6380.625 ÷ 0.98
00.6250.625 ÷ 1
−0.09470.690.625 ÷ 0.9053
−0.0650.6680.625 ÷ 0.935
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.060.6650.625 ÷ 0.94
00.6250.625 ÷ 1
−0.040.6510.625 ÷ 0.96
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.020.6380.625 ÷ 0.98
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.020.6380.625 ÷ 0.98
00.6250.625 ÷ 1
−0.10.6940.625 ÷ 0.9
−0.080.6790.625 ÷ 0.92
−0.04730.6560.625 ÷ 0.9527
0.040.6010.625 ÷ 1.04
00.6250.625 ÷ 1
−0.030.6440.625 ÷ 0.97
−0.020.6380.625 ÷ 0.98
0.020.6130.625 ÷ 1.02
−0.020.6380.625 ÷ 0.98
−0.0650.6680.625 ÷ 0.935
00.6250.625 ÷ 1
−0.10.6940.625 ÷ 0.9
−0.050.6580.625 ÷ 0.95
−0.080.6790.625 ÷ 0.92
−0.030.6440.625 ÷ 0.97
00.6250.625 ÷ 1
−0.0650.6680.625 ÷ 0.935
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.060.6650.625 ÷ 0.94
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.030.6440.625 ÷ 0.97
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.10.6940.625 ÷ 0.9
00.6250.625 ÷ 1
−0.050.6580.625 ÷ 0.95
0.020.6130.625 ÷ 1.02
−0.080.6790.625 ÷ 0.92
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.030.6440.625 ÷ 0.97
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.0650.6680.625 ÷ 0.935
00.6250.625 ÷ 1
−0.09470.690.625 ÷ 0.9053
00.6250.625 ÷ 1
−0.04730.6560.625 ÷ 0.9527
−0.06720.670.625 ÷ 0.9328
−0.06720.670.625 ÷ 0.9328
−0.040.6510.625 ÷ 0.96
−0.080.6790.625 ÷ 0.92
−0.050.6580.625 ÷ 0.95
0.050.5950.625 ÷ 1.05
−0.050.6580.625 ÷ 0.95
−0.050.6580.625 ÷ 0.95
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.050.6580.625 ÷ 0.95
−0.050.6580.625 ÷ 0.95
−0.050.6580.625 ÷ 0.95
−0.020.6380.625 ÷ 0.98
−0.050.6580.625 ÷ 0.95
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
−0.0670.670.625 ÷ 0.933
00.6250.625 ÷ 1
−0.020.6380.625 ÷ 0.98
−0.040.6510.625 ÷ 0.96
−0.04730.6560.625 ÷ 0.9527
00.6250.625 ÷ 1
00.6250.625 ÷ 1
00.6250.625 ÷ 1
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