What is the disk score tool actually useful for?

The disk score calculator is best for turning raw substat values into an efficiency score you can compare quickly. It is most useful when you are deciding whether a piece is worth keeping or whether it really upgrades a current build, instead of overreacting to a single crit line.

Disk Score Calculator

Enter disk substat values to calculate roll efficiency. Select up to 4 substats.

What is this score actually measuring?

This tool measures substat efficiency rather than just summing visible numbers. Each selected substat is compared against its theoretical ceiling, then weighted by the current preset. It is best used to answer whether a piece is worth keeping, not to replace full build judgment.

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Roll Efficiency: 0%

Select Substats

Select substats to start scoring

How to read the result

S and A grades usually mean the piece is efficient enough to keep or upgrade.
B grades are often transitional pieces when resources are tight.
C and D grades are not always useless, but they rarely justify heavy investment.

Do not ignore these constraints

The correct main stat often matters more than the substat score.
Different characters value stats differently, so always use the right preset first.
A high-score off-piece does not always beat a lower-score piece that completes a useful set.

Score is based on roll efficiency percentage with weighted stat values. For reference only.

Before you score a piece

Pick weights based on the role first, because a carry, support, and balanced setup should not judge substats the same way.
A high score is not an automatic keep. You still need to check main stat, set requirement, and your current account gap.
When two pieces are close, pair the result with the stats or DPS calculator to see the real in-build gain.