Risk of Rain 2 Calculator

Info

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This site is far from being 100% complete and will have bugs in some calculations at the current point of time!
Some functions may not work at all.

This webpage is to be used for theorycrafting with proc chances of items when playing specific characters or combined with the 57 Leaf Clover.

IMPORTANT: Some values will be WRONG, this is due to how computers in general handle floating points and the toFixed(int) function in JavaScript rounding numbers up (i.e 99.999999% is rounded up to 100.00%). While this won't affect most item/clover combinations, it is important to let the user be known of this.

Things to come for this webpage

• "How many do I need of item X with survivor Y to get >=100% proc chance"
• Item table to see stat X from item Y at Z stacks

Percentage Calculator (work in progress..)

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What is % of ? .

57 Leaf Clover Calculator

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Having SELECT AN ITEM Sticky Bomb Stun Grenade Tri-Tip Dagger AtG Missile Mk. 1 Bandolier Ghor's Tome Ukelele Happiest Mask Sentient Meat Hook Molten Perforator Brittle Crown Spinel Tonic (s) with clover(s) turns the proc chance from % to %.

What is the new proc chance of an item with % proc chance when carrying clover(s)? %.

How many clovers are needed to go from a proc chance of % to atleast %? .

The math behind 57 Leaf Clover

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To calculate proc chances with 57 Leaf Clover we need to track three important variables:

• \(p\) - Total item proc chance where \(p\) is [0.0, 1.0] (i.e \(p\) is between 0.0 - 1.0).
• \(x\) - The number of clovers the player is carrying.
• \(y\) - The new proc chance.

We can now use the following function is used to calculate the new proc chance: \[y = {1 - (1 - p)^{(x + 1)}}\]

The inverse of the function is: \[x = {\log(1 - y) \over \log(1 - p)} - 1\] which can be used in order to calculate how many clovers the player needs to carry in order to go from proc chance \(p\) to \(y\).