OSRS Max Hit Calculator
High-precision calculation utility providing accurate real-time metrics.
Understanding This Calculator
Max hit is the highest amount of damage a hit can deal in a single attack in Old School RuneScape. For melee combat it depends on your Strength level, any strength bonus from equipped gear, active prayers, and your chosen attack style, which all combine through the game’s published max hit formula.
Small changes compound: a strength prayer alone can add several strength levels’ worth of effective strength, while switching to an aggressive attack style adds a flat +3 bonus that stacks with everything else.
- EffStr floor(Strength level × prayer multiplier) + style bonus + 8
- StrBonus strength bonus from equipped gear
This calculator implements OSRS’s publicly documented melee max hit formula (widely published on community wikis); it performs only this factual math and does not reproduce any game text, art, or branding.
What is the OSRS Max Hit Calculator?
The OSRS Max Hit Calculator is an essential combat optimization tool for players of Old School RuneScape. Whether you are engaging in high-level Player vs. Monster (PvM) encounters or testing your skills in Player vs. Player (PvP) combat, knowing your maximum possible damage output is crucial for selecting the right gear and planning your attacks. This tool helps players instantly determine their highest possible hit under various combat scenarios.
By inputting your character’s combat stats, active prayers, equipped gear, and any special attack multipliers, the calculator mathematically simulates the complex combat mechanics of OSRS. This allows players to experiment with different weapon setups and armor combinations to find the most efficient and deadly loadout without having to test it in the dangerous lands of Gielinor.
How to Calculate Old School RuneScape Max Hits (The Formula)
The max hit calculation in OSRS is highly complex. The base formula is generally: Max Hit = 0.5 + (Effective Strength Level × (Equipment Strength Bonus + 64)) / 640. This result is then rounded down and multiplied by special modifiers like the Salve Amulet, Slayer Helmet, or weapon special attacks.
Frequently Asked Questions
Why does the formula add +8 to effective strength?
The +8 is a fixed base term in the published melee max hit formula that applies to every calculation regardless of prayers or attack style, ensuring even an unboosted, accurate-style hit has a non-zero effective strength.
Does attack style affect accuracy as well as max hit?
Yes — aggressive, controlled, and accurate/defensive styles also change your effective Attack level for accuracy rolls, but this calculator focuses specifically on the max hit (damage) side of the formula.
Does my combat style affect my max hit in OSRS?
Yes. Using the ‘Aggressive’ combat style provides an invisible +3 boost to your Strength level, which can frequently increase your maximum hit compared to using Accurate or Defensive styles.
Do stat-boosting potions increase my max hit?
Absolutely. Potions like the Super Strength or Divine Super Combat potion temporarily raise your Strength level, directly increasing your effective strength and, consequently, your max hit.
How do damage-boosting prayers interact with the max hit formula?
Prayers like Piety or Rigour multiply your visible stat level before it is factored into the effective strength calculation, providing a significant boost to your overall maximum damage output.