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Critical Hit Chance Calculator

Work out critical hit chance instantly with clear inputs, formula shown and shareable results.

About Critical Hit Chance Calculator

Critical chances from different sources add before being capped at 100%, and across independent attacks the chance of at least one crit is one minus the miss rate to the power of attacks. A 35% crit chance almost certainly produces a crit over ten attacks, which is why crit-dependent builds get more reliable the longer the fight lasts.

Formulas

Total chance

total = base chance + bonus chance, capped at 100%

At least one crit

P = 1 - (1 - total chance) ^ attacks

Worked example

With the default values below, Critical Hit Chance Calculator returns Total critical chance of 35.000%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Base critical chanceaccepts 0–100 %
15 %
Bonus critical chance from gearaccepts 0–100 %
20 %
Attacks in the rotationaccepts 1–200
10

Results

Total critical chance
35.000%
Critical hits expected
3.500
Chance of at least one crit
98.6537%
Chance every attack crits
0.002759%

Step by step

  1. 1Values used
  2. 2Total chance
  3. 3At least one crit
  4. 4Total critical chance= 35.000
  5. 5Critical hits expected= 3.500
  6. 6Chance of at least one crit= 98.6537
  7. 7Chance every attack crits= 0.002759

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 6 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Critical Hit Chance figure worked out?

total = base chance + bonus chance, capped at 100%. Critical chances from different sources add before being capped at 100%, and across independent attacks the chance of at least one crit is one minus the miss rate to the power of attacks.

Why does this matter?

A 35% crit chance almost certainly produces a crit over ten attacks, which is why crit-dependent builds get more reliable the longer the fight lasts.

What do I need to enter?

Enter base critical chance, bonus critical chance from gear, attacks in the rotation. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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