POE Crit Chance Calculator

Advanced Critical Chance Inputs

Base critical chance (%)

Added base critical chance (%)

Increased critical chance (%)

More critical chance (%)

Less critical chance (%)

Power charges

Increased chance per charge (%)

Enemy reduction (%)

Hits per second

Hits per skill cycle

Critical multiplier (%)

Average normal hit

Use lucky critical roll

Formula Used

Total Base Chance = Base Critical Chance + Added Base Critical Chance

Charge Increase = Power Charges × Increased Chance Per Charge

Total Increased = Increased Critical Chance + Charge Increase

Raw Chance = Total Base Chance × (1 + Total Increased ÷ 100) × (1 + More ÷ 100) × (1 - Less ÷ 100)

Capped Chance = Raw Chance limited between 0% and 100%

After Enemy Reduction = Capped Chance × (1 - Enemy Reduction ÷ 100)

Lucky Effective Chance = 1 - (1 - Chance)²

Expected Hit Value = Normal Hit × [(1 - Crit Chance) + Crit Chance × Critical Multiplier]

How to Use This Calculator

Enter the base critical chance from your weapon, spell, or skill.
Add any extra base critical chance from items or effects.
Enter increased critical chance from gear, passives, gems, and buffs.
Add power charges and the increase gained from each charge.
Use more or less modifiers when your setup has them.
Enter enemy reduction when a target lowers your final chance.
Enable lucky rolls when your crit chance is rolled twice.
Submit the form and review the result above the inputs.

Example Data Table

Setup	Base	Added Base	Increased	Charges	Lucky	Estimated Effective Chance
Starter attack	5%	0%	260%	3	No	25.50%
Spell setup	6%	1.5%	300%	4	No	45.00%
Lucky burst	7%	0%	400%	5	Yes	77.44%
Near cap build	8%	0%	800%	6	No	100.00%

Why Critical Chance Matters

Critical chance shapes how often a hit becomes a critical strike. In Path of Exile, this value can change many build choices. A small base value can become strong when increased modifiers stack well. Power charges also matter. More multipliers can move the result quickly. Lucky rolls then improve the effective chance without changing the shown capped value.

This calculator keeps those steps visible. It separates base chance, added base chance, increased chance, charge scaling, more effects, less effects, and enemy reduction. Each field has a clear purpose. You can test a weapon, spell, or skill setup. You can also compare normal rolls with lucky rolls. That helps when judging flasks, passives, support gems, or temporary buffs.

A useful result is not only one percentage. Final capped chance shows the direct roll chance after modifiers. Effective chance shows the practical chance after lucky rolling. Chance for at least one crit helps with multi hit skills. Critical strikes per second helps fast attacks. Expected hit value combines chance and critical multiplier. Together, these outputs show both reliability and damage value.

Use conservative inputs when planning. Some effects apply only to attacks. Some apply only to spells. Some buffs are conditional. The calculator allows custom charge values and custom penalties, so unusual setups can still be tested. Check your character sheet and item text before deciding. Then use this page to compare possible upgrades.

The best upgrades often depend on your current base chance. When base chance is low, added base chance can be valuable. When base chance is already high, multiplier or damage upgrades may be better. If you are near the cap, extra critical chance may add little. That is why the capped result is important.

This tool is meant for estimates, planning, and comparison. Game mechanics can include special rules. Always review skill wording and current character conditions. Still, a transparent calculator gives a fast starting point. It makes build choices easier to explain. It also helps you avoid wasting points on weak increases. Because each result appears together, comparisons stay simple. Change one input, recalculate, and note the difference. This method supports careful testing before spending currency, passives, or item slots on upgrades later.

FAQs

What is base critical chance?

Base critical chance is the starting crit value from a weapon, spell, or skill. Added base critical chance increases this starting value before increased modifiers are applied.

Does increased critical chance add directly?

No. Increased critical chance usually scales the total base chance. For example, 200% increased means the base chance is multiplied by three before other factors.

What do power charges do here?

The calculator multiplies your power charge count by the chosen increase per charge. This lets you test default setups or custom values from special modifiers.

What is lucky critical chance?

A lucky roll checks the chance twice and keeps the better outcome. The calculator converts that into an effective chance using one minus the failed chance squared.

Why is the result capped at 100%?

A critical chance cannot exceed certainty. Raw values may rise above 100%, but the calculator caps the direct chance at 100% before later practical estimates.

What is chance for at least one crit?

This value estimates the chance that at least one hit crits during a multi hit skill cycle. It is useful for skills that hit many times quickly.

How is expected hit value calculated?

Expected hit value blends normal hits and critical hits. It uses effective critical chance, average normal hit value, and your critical multiplier percentage.

Is this calculator exact for every build?

It is an estimate tool. Some game effects have special wording or conditions. Use your character details and current skill text when making final decisions.