How does Diablo 4 combine damage bonuses?

Most damage bonuses in Diablo 4 are additive within a bucket, then buckets multiply together. Additive percentages like damage to close or damage while healthy sum up, while critical, vulnerable, and key multipliers each apply as their own factor on top.

How is critical strike averaged into DPS?

Average crit multiplier is 1 plus crit chance times crit damage bonus. A 50 percent crit chance with a 150 percent crit damage bonus averages 1 + 0.5 × 1.5 = 1.75 times your base hit, which the tool applies to give expected sustained DPS.

Is vulnerable damage a separate multiplier?

Yes. Vulnerable is its own multiplicative bucket in Diablo 4, so a 60 percent vulnerable bonus multiplies your damage by 1.6 against vulnerable targets. The tool lets you toggle it so you can compare against vulnerable and non-vulnerable enemies.

What counts as additive damage?

Additive damage includes most plus-percent-damage modifiers from skills, paragon, and gear that share a bucket — damage while healthy, damage to close, core skill damage, and similar. Add them all together and enter the total as one percentage.

Why is effective DPS so much higher than weapon DPS?

Weapon DPS is just base damage times attack speed. Effective DPS layers crit, vulnerable, and additive buckets multiplicatively, which is why a modest weapon with strong multipliers can vastly outdamage a higher-base weapon with none.

Diablo 4 DPS Calculator

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Diablo 4’s damage looks simple on the tooltip but combines several multiplier buckets behind the scenes. This calculator applies the correct model — additive bonuses summed inside their bucket, then crit and vulnerable applied as separate multipliers — to give you an honest effective DPS figure for comparing builds.

How it works

The effective damage formula multiplies four components:

base hit      = weapon damage × (1 + additive% / 100)
crit factor   = 1 + critChance × critDamageBonus
vuln factor   = 1 + vulnerable% / 100   (if target is vulnerable)
effective DPS = base hit × crit factor × vuln factor × attacks per second

Additive modifiers sum together and apply once, while critical strike and vulnerable each apply as their own multiplicative factor — the heart of why multiplicative bonuses are so prized.

Example and tips

A weapon hitting 1,000 at 1.2 attacks per second, with 200 percent additive damage, 50 percent crit chance, a 150 percent crit damage bonus, and a 40 percent vulnerable bonus, reaches well over 6,000 effective DPS against vulnerable targets. Chase separate multiplicative sources — vulnerable, crit, and key aspects — rather than piling everything into the already-crowded additive bucket.