How does the five-IV-passing item work?

An item like a Destiny Knot makes the game pass down five of the twelve parent IVs at random instead of three. With both parents holding the right perfect IVs, this dramatically raises the chance any given offspring inherits all your target IVs.

How is the per-egg probability computed?

With five inherited slots chosen from the parents' IVs, the chance all your target IVs land in the inherited set follows the hypergeometric distribution, and any non-inherited target IV must roll a perfect value at 1 in 32. The tool multiplies these factors per egg.

What is the expected number of eggs?

If the per-egg success probability is p, the expected number of eggs to get at least one perfect offspring is 1 divided by p, the mean of a geometric distribution. A 4 percent per-egg chance averages 25 eggs, though variance is high.

Does Genshin Impact actually have breeding?

No. Genshin Impact has no breeding or IV system. This is a general monster-breeding probability model, the kind used in games like Pokemon, that you adapt by entering your target IV count and item setup. It computes the correct inheritance math regardless of the game.

How does nature inheritance change things?

If a parent holds a nature-locking item, the offspring inherits that nature with certainty, so nature is not a random factor. Without it, a specific nature is a 1 in 25 roll, which the tool folds into the per-egg probability when you enable the nature requirement.

Genshin Impact Breeding & IV Calculator

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Breeding a flawless specimen is a probability problem, not luck. This calculator uses the real inheritance math from creature-breeding games — hypergeometric IV passing with a five-IV item, 1-in-32 perfect rolls for the rest, and optional nature locking — to tell you the per-egg odds and how many eggs you should expect to hatch.

How it works

With a five-IV-passing item, five of the parents’ IV slots are inherited at random, and any target IV not inherited must roll perfect:

inherited target IVs ~ hypergeometric(passed = 5, target IVs, total 6 slots)
P(all targets perfect) = Σ over k of P(k inherited) × (1/32)^(targets − k)
nature factor = natureLock ? 1 : 1/25  (if a specific nature is required)
P(egg) = P(all targets perfect) × nature factor
eggs   = 1 / P(egg)

The expected egg count is the mean of a geometric distribution, 1 / p.

Example and tips

Targeting 5 perfect IVs with both parents holding them and a five-IV item, the per-egg chance is a few percent, so expect on the order of 20-40 eggs. Add a required nature without a nature-lock item and divide that chance by 25 — which is why serious breeders always use an Everstone-style nature lock first.