How does enchanting work in Diablo 4?

The Occultist lets you reroll a single affix on an item. Each reroll presents two random affixes from that slot's pool, and you pick one. So per reroll you have two independent draws against the pool, not one.

What is the chance of getting my target affix per reroll?

If the pool has P possible affixes and the Occultist shows 2 options, the chance your target appears in a reroll is 1 - ((P-1)/P)^2. For a pool of 8 that is about 23.4% per reroll, not 1 in 8.

How is the expected number of rerolls found?

It follows a geometric distribution: expected rerolls = 1 / perRerollChance. With a 23.4% per-reroll chance you average about 4.3 rerolls, though variance is high and you can go far over or under.

Why does the gold cost keep rising?

Diablo 4 increases the enchant cost each time you reroll the same item, so the total is an arithmetic series. The calculator sums starting cost plus the per-reroll increase across all expected rerolls to estimate true gold spent.

Can I see the odds within a fixed budget of rerolls?

Yes. The 'chance within N rerolls' figure is 1 - (1 - perRerollChance)^N, so you can check, for example, the probability of hitting your affix within 10 rerolls before you commit the gold.

Diablo 4 Enchant & Gear Score Calculator

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The Diablo 4 Enchant & Gear Score Calculator models the Occultist reroll grind: a pool of possible affixes, two draws shown per reroll, and a gold cost that climbs with each attempt. Enter those and it returns your true per-reroll odds, the expected number of rerolls, and the expected total gold to land your target affix.

How it works

Each reroll shows two affixes from a pool of size P, so the chance your target appears in one reroll is the complement of both draws missing:

perReroll = 1 - ((P - 1) / P)^2

Hitting the affix is a geometric process, so the expected number of rerolls is:

expectedRerolls = 1 / perReroll

Gold cost rises each reroll. With a starting cost c0 and per-reroll increase d, the total for n rerolls is the arithmetic series:

totalGold = n * c0 + d * n * (n - 1) / 2

Reading the result

Per-reroll chance is usually higher than 1/P because two affixes are offered.
Expected rerolls is an average — variance is large, so budget for streaks of bad luck (the “chance within N rerolls” figure helps you set a cap).
Expected gold plugs your average reroll count into the climbing-cost series, so it reflects the real escalating price rather than a flat per-attempt cost.