How is roll quality scored?

Quality is the rolled value's position within the min-to-max range, expressed as a percentage. A roll at the maximum scores 100 percent, a roll at the minimum scores 0 percent, and a value halfway scores 50 percent.

How does the tool estimate attempts to beat a roll?

It assumes each attempt has a chance the affix appears and, when it does, the value is uniform across its range. The per-attempt chance of matching or beating your roll is that appearance chance times the share of the range at or above your value, and the expected attempts is one divided by that probability.

What counts as a perfect roll?

A perfect roll is the maximum value the affix can produce. The tool reports the distance between your rolled value and that maximum so you can judge whether it is worth chasing a better one.

Why is my expected-attempts number so high?

If a roll is already near perfect, the share of the range that beats it is tiny, so the expected number of attempts to improve on it grows very large. That is the mathematical reason to stop rerolling once a roll is in the top few percent.

What if my rolled value is outside the range?

The tool flags an out-of-range value and clamps it for scoring. Double-check the min and max for that affix, since an out-of-range entry usually means the range was typed incorrectly.

Elden Ring Breeding & IV Calculator

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Not every Elden Ring affix roll is worth keeping, and chasing a marginally better one can cost dozens of attempts. This calculator scores any roll against its possible range and estimates how many tries it would take to match or beat it, so you know when to keep and when to reroll.

How it works

Roll quality is the rolled value’s position on the min-to-max range:

quality%        = (rolled − min) / (max − min) × 100
share at-least  = (max − rolled) / (max − min)
chance/attempt  = appearChance × share at-least
expected tries  = 1 / (chance/attempt)

A roll near the maximum scores close to 100 percent and leaves only a tiny share of the range that could beat it — which is exactly why the expected number of attempts to improve climbs so steeply for already-good rolls.

Example and tips

A roll of 28 on an affix that ranges 22–35 scores about 46 percent of perfect and sits 7 points below the maximum. If the affix appears on roughly half of attempts, expect a couple of attempts to match or beat it. Once a roll is above ~90 percent of perfect, the math says to stop — the remaining gain rarely justifies the grind.