OSRS DPS Calculator (Old School RuneScape)
Calculate Old School RuneScape damage per second (DPS), hit chance, max hit, and time to kill.
How to Use the OSRS DPS Calculator (Old School RuneScape)
In Old School RuneScape (OSRS), combat efficiency against raid bosses and slayer monsters is dictated by Damage Per Second (DPS). The game operates on a discrete 0.6-second server tick system. Every attack involves two distinct mathematical steps: an accuracy roll to determine whether you hit or splash/miss (0 damage), and a damage roll ranging uniformly from 0 to your maximum hit.
Formula and Calculation Methodology
- Accuracy: Probability of beating target monster’s defence roll
- Max Hit: Highest damage value possible computed from effective strength and gear bonus
- Attack Speed: Interval between attacks measured in 0.6-second game ticks
Because average damage on a successful hit is exactly half of your max hit (Max Hit / 2), weapon attack speed is often more valuable than high single-hit numbers. A 4-tick weapon like the Abyssal Whip or Bow of Faerdhinen attacks 33% faster than a 5-tick weapon, making accuracy and strength gear stacking critical for Tombs of Amascut (TOA), Theatre of Blood (TOB), and Chambers of Xeric (CoX).
OSRS Weapon Attack Speed and Tick Timings
| Attack Speed | Seconds per Hit | Attacks per Minute | Popular Weapon Examples |
|---|---|---|---|
| 3-Tick | 1.8 Seconds | 33.3 Hits / min | Toxic Blowpipe, Chinchompas, Darts |
| 4-Tick | 2.4 Seconds | 25.0 Hits / min | Abyssal Whip, Bow of Faerdhinen, Dragon Scimitar |
| 5-Tick | 3.0 Seconds | 20.0 Hits / min | Osmumten’s Fang, Armadyl Crossbow, Godswords |
| 6-Tick | 3.6 Seconds | 16.7 Hits / min | Elder Maul, Colossal Blade, Heavy Ballista |
| 7-Tick | 4.2 Seconds | 14.3 Hits / min | Dark Bow, Halberds |
Frequently Asked Questions
Why is 4-tick considered the standard for OSRS combat?
A 4-tick attack speed (2.4 seconds) hits a sweet spot between high equipment strength bonuses and frequent damage rolls, yielding optimal DPS across most monster defence thresholds.
What does a defence-reducing spec weapon do to DPS?
Special attack weapons like the Dragon Warhammer (30% defence reduction) or Bandos Godsword lower the monster’s defence roll, drastically increasing your hit chance and DPS.
How does prayer boosting affect max hits?
Piety (+23% Strength, +20% Attack) and Rigour (+23% Ranged Strength, +20% Ranged Attack) provide massive multipliers that multiply before gear bonuses are added.