# Procs per minute

**Procs per minute** (PPM) describes how a given proc mechanic functions. It is often used to contrast a game mechanic with one that uses "procs per hit" (PPH).

## Contents

## In World of Warcraft

### PPM vs. PPH

In *World of Warcraft*, PPH is the percent chance of a proc occurring each hit. PPH benefits greatly from faster hits.

PPM scales to PPH according to weapon speed. Here is the formula:

- PPH = (Weapon speed) / (60 / PPM)

which is the same as:

- PPH = Weapon speed * PPM / 60

This gives the percentage chance that the proc will be triggered each hit. Note that PPM is an **average**, not a guarantee.

### PPM & Haste

The speed used for calculating the PPH (Proc per Hit) chance is the basic weapon speed, not the characters Haste-affected hit speed. This means the **probability** of a proc **per hit** is not affected by Haste. But since Haste increases the number of hits per minute, it also increases the total number of procs.

### Instant attacks

The PPM rate of a given effect is based on auto-attacks ("white damage" attacks) made with that weapon. However, an effect on the main-hand weapon can proc **more often** than its PPM rating, as **instant attacks** (Sinister Strike, Overpower, etc.) are all assumed to be made with the main hand, and therefore can trigger the proc.

In addition, because instant attacks use the *calculated PPH rate* based on the weapon speed, yet are not themselves restricted by the weapon speed, a slower weapon will result in more total procs.

For example, a Warrior has Crusader (PPM of 1) on a 2.0-speed and a 2.5-speed weapon. These calculations assume ample Rage and no misses.

- Weapon 1 (speed 2.0): 30 white hits per minute, so PPH is 1/30.
- Weapon 2 (speed 2.5): 24 white hits per minute, so PPH is 1/24.

Each minute, the Warrior also does 10 Bloodthirsts, 6 Whirlwinds, and 4 Overpowers, for a total of 20 instant attacks.

- Weapon 1 (PPH 1/30): 50 hits (20 instant + 30 white), so actual PPM is 50/30 = 1.67.
- Weapon 2 (PPH 1/24): 44 hits (20 instant + 24 white), so actual PPM is 44/24 = 1.83.

Therefore, the slower the weapon you wield in the main hand, the more often any PPM-rated ability on it will proc, assuming you use any special attacks that can trigger the proc.

All these calculations are made with no [Flurry] included.

### PPM Rates

- [Formula: Enchant Weapon - Berserking]: 1 (does not appear to proc from instant attacks)
- [Formula: Enchant Weapon - Crusader]: 1
- [Formula: Enchant Weapon - Mongoose]: 1.2
- [Formula: Enchant Weapon - Icy Chill]: 1.6
- [Formula: Enchant Weapon - Unholy]: 3
- [Formula: Enchant Weapon - Lifestealing]: 6
- [Formula: Enchant Weapon - Fiery Weapon]: 6