osrs dps calculator

What this OSRS DPS calculator does

This calculator estimates your damage per second (DPS) in Old School RuneScape for melee auto-attacks. It combines three core pieces of combat math: max hit, hit chance, and attack speed. Instead of guessing whether one item swap is better than another, you can compare setups directly with numbers.

For practical PvM decisions, DPS is usually the most useful quick metric: it tells you how fast you can remove HP from a boss or monster over time. We also include an estimated time-to-kill when you provide target HP.

How the formula works (simple version)

1) Effective levels

Your visible stats (Attack and Strength) are first scaled by prayer and optional multipliers, then style bonuses are added. The calculator applies:

• Effective Attack = floor(Attack level × attack multipliers) + style attack bonus + 8
• Effective Strength = floor(Strength level × strength multipliers) + style strength bonus + 8

2) Max hit

Max hit uses effective strength and your melee strength bonus:

• Max Hit = floor(0.5 + Effective Strength × (Strength Bonus + 64) / 640)

3) Accuracy

Hit chance comes from attack roll versus defence roll:

• Attack Roll = Effective Attack × (Attack Bonus + 64)
• Defence Roll = Effective Defence × (Defence Bonus + 64)

The game then uses a piecewise formula depending on which roll is larger. Higher attack roll relative to defence roll means you connect more often.

4) DPS

Average damage on a successful hit is approximately Max Hit / 2. Expected damage per swing is:

• Expected damage per attack = Accuracy × (Max Hit / 2)
• Attacks per second = 1 / (Attack speed in ticks × 0.6)
• DPS = Expected damage per attack × Attacks per second

How to use this calculator for gear upgrades

Compare one change at a time

If you want clean conclusions, adjust only one variable per test:

• Swap one weapon and keep everything else the same.
• Test one amulet or ring upgrade at a time.
• Compare aggressive vs accurate stance for your target.

Use realistic enemy stats

DPS can swing wildly depending on target defence. A setup that looks amazing on low-defence monsters might underperform on high-defence bosses. Enter defence values that match your real content: Slayer tasks, bossing, or raid rooms.

Tips to increase DPS in OSRS

• Prioritize attack speed and max hit breakpoints: A faster weapon can outperform a bigger max hit if it attacks much more often.
• Use the right prayer: Piety-level boosts improve both accuracy and max hit and often beat small gear upgrades.
• Avoid over-tanking when unnecessary: Defensive gear can reduce your offensive bonuses and lower real kill speed.
• Bring content-specific multipliers: Slayer helmet, Salve amulet effects, and special set bonuses can dramatically boost real DPS.
• Optimize for target defence: On tanky targets, accuracy upgrades can be more valuable than pure strength bonus.

Limitations and notes

This page is intended for fast planning, not full simulation. It does not model every special mechanic in the game (special attacks, poison/venom, delayed effects, multi-hit abilities, or encounter-specific modifiers). For deep optimization, combine this with in-game testing and encounter guides.

Still, for most everyday comparisons—especially standard melee auto-attacks—this calculator gives a strong and practical estimate.

Quick FAQ

Is this a max hit calculator too?

Yes. It outputs max hit and uses it as part of the DPS calculation.

Why did my DPS go down when my max hit went up?

Usually because your accuracy or attack speed got worse. DPS is the combined result of all three factors.

What attack speed should I enter?

Enter your weapon speed in ticks. Most common melee setups are 4-tick, but this varies by weapon.