Does Diablo 4 actually have breeding or IVs?

No — Diablo 4 has no creature breeding or hidden IVs. The equivalent concept is affix and aspect roll ranges: every stat rolls a value between a fixed minimum and maximum, and how high you roll is the real 'roll quality' this tool scores.

How is the roll percentage calculated?

It is a linear position within the range: percent = (rolled - min) / (max - min) * 100. A value sitting exactly at the maximum scores 100% (a perfect roll); sitting at the minimum scores 0%.

What counts as a good roll?

Most players treat 80% or higher as a strong roll worth keeping, and 95% or higher as near-perfect. Below about 50% the affix is usually a reroll candidate, especially on a build-defining stat or an aspect.

Why do the same affix ranges differ between items?

Roll ranges scale with item power and item type, so a higher item-power piece has a higher min and max for the same affix. Always read the range off the specific item rather than assuming a fixed band.

Can I compare two pieces with this?

Yes. Score each item's key affix as a percentage of its own range, then compare the percentages. A 90% roll on a higher base range can still beat a 100% roll on a weaker base, so check both the percent and the raw value.

Diablo 4 Breeding & IV Calculator

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Diablo 4 has no breeding or hidden IVs — but the feeling of chasing a “perfect” is real, and it comes from affix and aspect roll ranges. Every stat rolls between a fixed minimum and maximum, and this tool scores exactly how close your roll is to a perfect one, so you know whether to keep, enchant, or reroll.

How it works

A roll’s quality is its linear position inside the allowed range:

rollPercent = (rolled - min) / (max - min) * 100

A roll at the maximum scores 100% — a perfect roll.
A roll at the minimum scores 0%.
The “distance from max” is simply max - rolled, telling you how much you would gain from a perfect reroll.

Reading the result

95–100% — near-perfect, keep it.
80–95% — strong, usually not worth rerolling.
50–80% — fine for now, a reroll target for end-game.
Below 50% — weak; if it is a build-defining affix or aspect, reroll it.

Because ranges scale with item power, always pull the min and max from the specific item. A 90% roll on a high item-power base can out-value a 100% roll on a weaker base, so compare both the percentage and the raw rolled value.