RPG Critical Hit Damage Calculator
How to Calculate Crit Rate and Crit Damage
In most modern RPGs and Action-RPGs like Genshin Impact, Honkai Star Rail, or Diablo, your damage output is determined by the synergy between three core stats: your raw attack power, how often you crit (Crit Rate), and how hard those crits hit (Crit Damage).
The fundamental formula for a Critical Hit is:
Damage = Non-Crit Damage × (1 + Crit Damage %)
The "Average Damage" Formula
The most important metric for optimizing a character build is Average Expected Damage. This tells you your consistent output over time, accounting for the hits that don't crit. The formula is:
Average Damage = Base Damage × [1 + (Crit Rate % × Crit Damage %)]
The 1:2 Golden Ratio Rule
For mathematical efficiency, most players aim for a 1:2 ratio between Crit Rate and Crit Damage. For example, if you have a 50% Crit Rate, you should ideally have 100% Crit Damage. If you have 70% Crit Rate, aim for 140% Crit Damage. This ratio ensures you aren't over-investing in huge crits that never happen, or frequent crits that deal no extra damage.
Example Calculation
- Base Attack: 2,000
- Crit Rate: 60% (0.60)
- Crit Damage: 120% (1.20)
Your Average Damage would be: 2,000 × [1 + (0.60 × 1.20)] = 2,000 × 1.72 = 3,440.