OSRS DPS Calculator

It uses the standard Bitterkoekje DPS formulas — the same math the OSRS Wiki publishes for melee, ranged, and magic combat. For each attack the calculator computes:

1. Effective level = floor(stat × prayer multiplier) + style bonus + 8 (+ Void bonus)
2. Max hit = floor(0.5 + effective Strength × (str bonus + 64) / 640), then multiplied by gear-set bonuses (Slayer Helm, Salve, Inquisitor's, etc.)
3. Hit chance from your accuracy roll vs. the target's defence roll
4. DPS = (max hit ÷ 2) × hit chance ÷ weapon attack speed in seconds

Inputs come from your equipped items (stats stored in this site's item database) and the selected target NPC (defence levels and HP from the OSRS Wiki).

Max hit is the largest single hit your setup can roll on a perfect-accuracy attack. DPS is your average damage per second — max hit × hit-chance × attack-speed.

A higher max hit doesn't always mean higher DPS. A weapon with a 4-tick attack speed and 30 max hit beats a 5-tick weapon with 35 max hit at most accuracy levels because of the higher attack rate. The Toxic Blowpipe and Twisted Bow win specifically on attack speed and accuracy scaling.

Yes — tick the "On Slayer task" checkbox and equip an Imbued Slayer Helmet (or Black Mask (i)). The calculator applies the standard +16.67% (× 7/6) accuracy and damage bonus to whichever combat style you're using.

The bonus stacks multiplicatively with Salve Amulet (ei) on undead targets — that's how Vorkath builds get such high DPS even at moderate gear levels.

Within ~0.5% for standard combat scenarios. The math is identical to the formulas the OSRS Wiki publishes and that gearscape.net / oldschool.tools / DPS Calc all use. Differences come from edge cases not yet in v1:

• Special attacks (Dragon claws, AGS, Voidwaker, Tumeken's Shadow) — coming in v2
• Twisted Bow scaling against specific Magic levels — coming in v2
• Multi-hit weapons like the Scythe of Vitur on size-2+ targets — coming in v2
• Set bonuses for Inquisitor's (already supported on Crush attacks)

Three common causes:

1. You picked the wrong attack bonus type. Slash on a target with high def_slash but low def_stab will under-perform. Check the Wiki's defence table for the target.
2. The target has a stat that punishes your style. Pestilent Bloat has 600 magic defence; nothing magic touches it. Aviansie have 200+ Magic level which the Twisted Bow scales against (good thing) but a Trident is wasted (bad).
3. You're wielding gear with negative offensive bonuses for that style. Armadyl on melee tasks gives a negative melee attack bonus — your accuracy drops if you wear it.

Priority order for any non-Ironman build:

1. Imbued Slayer Helm — if your task list overlaps the boss
2. BiS weapon for the style — Fang for stab, Scythe for slash on size 2+, Tumeken's Shadow for magic, Twisted Bow for high-magic targets
3. Body + legs — Torva > Bandos > Fighter Torso for melee; Masori > Armadyl > Black D'hide for ranged
4. Amulet — Salve (ei) on undead, Torture for melee, Anguish for ranged, Occult for magic
5. Gloves and boots — Ferocious Gloves and Primordial Boots are the biggest per-GP DPS gains in the slot

Use the BiS Calculator to see the full ranked list per style. Need GP fast? Probemas sells OSRS gold with same-hour Grand Exchange delivery.

Yes — all panels stack vertically below 1100px viewport. The dropdowns are native (not Select2 in v1) so they work with any touch input. Save the page to your home screen for offline reference; everything calculates client-side, no server round-trips.

Coming in v2. Phase 2 of the calculator adds:

• Dragon claws 4-hit pattern (50% / 25% / 25% / hybrid)
• Armadyl godsword × 1.375 dmg + × 2 acc + automatic-hit on the spec
• Voidwaker guaranteed-hit 50–150% max
• Tumeken's Shadow magic damage triple-cap
• Scythe of Vitur multi-hit on size-2+ NPCs
• Twisted Bow full magic-level scaling formula
• Dragon Hunter weapons × 1.25 vs dragons

Track our progress on the blog for v2 launch.