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Attack Speed ( $$AS$$ ) is the frequency with which units attack is measured. A unit's attack speed can be modified by items, per point of, abilities providing flat bonuses and auras.

Mechanics
Most heroes have a base attack speed and base attack time of and  respectively.

Total attack speed is defined as



With  being the base attack speed,   and   being the flat additive and flat reduction bonuses. The total attack speed value has a minimum of and an maximum value of.

The attack rate is the amount of attacks a unit can launch within a second, and is defined as

With  being the amount of attacks per second (Attack Rate),   being the hero's base attack speed and   being the base attack time.

Therefore, the time needed per attack a hero launches is defined as



Base Attack Time
Every unit has a base attack time ( BAT ), which refers to the default interval between attacks for a unit without considering and attack speed bonus.

For example, a has a BAT of, and thus attacks once per second by default. Similarly, if a hero with BAT with no  and no bonus attack speed, they would attack once every 1.7 seconds. While nearly every unit can have their attack speed modified, only a few heroes can actively change their BAT.

Examples

 * With a base attack time of, base attack speed and   at level 1. What is 's current attack rate?






 * attacks about times per second in this example, and takes  seconds between attacks.

Benchmark
Most heroes' attack rate is attacks per second. Attack speed is expressed in percent of base attack speed. The base is therefore expressed as. Each point of increased attack speed (IAS) sources add point to it, and attack speed works together with base attack time to determine how often a unit can attack.

When hovering over the hero's attributes in the HUD, the first field shows the attack speed and the time required per attack in parenthesis. The attack speed field is defaulted to and adds the attack speed bonuses or reductions afterwards, leading to a minimum of  and a maximum value of.

Even though the HUD may show a unit to exceed these boundaries, the actual attack speed used for calculations will still obey the minimum and maximum values.

For units that do not have BAT, the attack speed values in the HUD will be displayed as if they have  BAT. For example, a unit with BAT and no other attack speed bonus sources will display itself as having an attack speed of, because  seconds is how long a unit with  BAT and  attack speed would take in between attacks.

This strange quirk makes it harder to figure out if a hero without the standard BAT is nearing maximum attack speed, but it does allow players to compare this uniform metric across all heroes easier.

The following table shows the attack speed benchmarks and their effect on attacks per second:

Exceptions
Most heroes have a BAT of except for the following:

Base Attack Speed Manipulation
Most base attack speed manipulation abilities sets the caster's base attack time to a certain value, unless stated otherwise by the ability descriptions.

Minimum Attack Speed
(no records)

Maximum Attack Speed
The following abilities are able to change a unit's maximum attack speed (of ), allowing it to reach even higher values. If a unit is affected by multiple abilities that change the maximum value, the higher value takes priority.

Patch History
Velocidade de ataque Скорость атаки 攻击速度