How is the inheritance probability calculated?

The inherited IV slots are chosen at random from all stat slots. The chance they include all your target stats is the hypergeometric value C(slots minus target, inherited minus target) divided by C(slots, inherited). It is the probability the random selection covers every target slot.

How many IVs are inherited per egg?

Without a breeding item the offspring usually inherits 3 IVs at random from the parents. A Destiny-Knot-style item raises this to 5, which dramatically increases the odds of stacking multiple perfect IVs. Set this field to match your item.

Why does the chance hit zero sometimes?

If you ask for more target IVs than are inherited per egg, it is impossible in a single generation. For example, you cannot get 4 perfect IVs when only 3 are passed down. Raise the inherited count or breed in stages to fix this.

How does nature affect the odds?

If you need a specific nature, the parent holding the nature item passes it with a known chance, typically 100% with an Everstone or about 50% without. The tool multiplies that chance into your IV odds for a combined per-egg success rate.

What does expected eggs mean?

It is one divided by the combined per-egg success chance, the geometric mean number of eggs to your first success. Real results vary widely around it, so treat it as a planning figure rather than a guarantee.

Valorant Breeding & IV Calculator

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Breeding for perfect IVs is a numbers game, and knowing the real odds saves you hours of hatching eggs blindly. This calculator uses the actual hypergeometric inheritance model to tell you the chance each egg has all your target IVs, then folds in nature odds and the expected egg count.

How it works

The offspring inherits a fixed number of IV slots, chosen at random from all stat slots. The probability those random slots include every one of your target stats is a hypergeometric draw:

P(all target inherited) = C(slots - target, inherited - target) / C(slots, inherited)

where C(n, k) is the binomial coefficient. Combined with the nature pass-down chance, the per-egg success probability is the product of the two, and the expected number of eggs to succeed is one over that:

combined  = P(IVs) × P(nature)
eggs      = 1 / combined

Example and notes

With the standard 6 IV stats, a Destiny-Knot passing 5 IVs, and a target of 4 perfect IVs, the inheritance chance is C(2, 1) / C(6, 5) = 2 / 6 ≈ 33.3%. If you also need a 50% nature pass-down, the combined chance is about 16.7%, or roughly 6 eggs on average. Note the impossible case: asking for 4 target IVs while only 3 are inherited yields a zero chance, since a single egg cannot pass more perfect IVs than its inherited slot count. Breed in stages — perfect one parent further — to break past that limit.