Diablo 2 Resurrected IAS Calculator

IEIAS = floor(120 × item IAS ÷ (120 + item IAS))

EIAS = IEIAS + SIAS − WSM + skill modifier

The final frame count applies the game animation length, start frame, action frame, and speed increment.

For rollback multi-hit skills, a middle dot separates the frame segment of each hit.

Hits per second is derived by completing every hit declared by the reference calculator. It can change when fewer targets or attacks are available, and is omitted for dodge and trap-laying actions.

Weapon names and WSM values come from the site’s D2R weapons.txt and item-names.json; the displayed build is read directly from dataversionbuild.txt.

Cleave and Mirrored Blades use the animation and skill-SIAS formulas from the bundled reference calculator. Their in-game frames may still need further verification.