How to Use the Critical Hit Probability Calculator
Critical hit chance and critical damage multiplier can each be hard to judge on their own, but in practice they multiply together to determine your real damage output. This calculator takes your base damage, crit chance, crit damage multiplier, and attacks per second, then gives you the expected average damage per hit including crits, your expected DPS, and exactly how many percent more damage you're dealing compared to plain hits.
The math is straightforward: multiply the chance of not critting by normal damage, multiply the chance of critting by the boosted damage, and add them together to get the expected average damage. For example, a 10% crit chance with a 2x multiplier means your average damage is 1.1 times base damage — in other words, a 10% overall damage increase.
When deciding whether to invest in more crit chance or more crit damage on your gear or talents, plug in each option here and compare the resulting damage boost directly. If your crit chance is already close to 100%, pushing it higher barely helps — raising the multiplier becomes the more efficient choice at that point.
Frequently Asked Questions
The damage boost is determined by the product of the two, so neither is absolutely more important on its own. However, once crit chance is already close to 100%, raising it further has almost no effect, so investing in the crit damage multiplier becomes more efficient at that point.
Expected DPS is a probabilistic average, so a short fight might get a lucky streak of crits or none at all. The more fights or hits you accumulate, the closer your actual results converge to the expected DPS.