CB Level Calc OSRS: Combat Formula & Guide

In Old School RuneScape, your combat level dictates everything from the monsters that ignore you in the Wilderness to the Slayer masters willing to assign you tasks. Whether you are building an optimized 1-Defence pure, tuning an account for Bounty Hunter, or pushing toward maxed stats, knowing how your stats translate into combat levels is essential. Using an accurate cb level calc osrs players can plan their skill progression efficiently, ensuring they never level up into an unfavorable bracket unintentionally.

How a CB Level Calc OSRS Tool Breaks Down Your Stats

Your combat level in OSRS ranges from a minimum of 3 to a maximum of 126 (or 138 in certain RS3 versions, but strictly 126 in OSRS). The calculation separates your skills into two categories: your defensive base and your dominant offensive style.

The calculation relies on seven distinct combat skills: Attack, Strength, Defence, Hitpoints, Prayer, Ranged, and Magic. The formula uses integer truncation (rounding down at each intermediate step) rather than continuous floating-point rounding.

The Base Combat Formula

Every account has a "base" combat calculation derived from survivability skills: Defence, Hitpoints, and Prayer.

• Base Value: 0.25 × [Defence + Hitpoints + floor(Prayer / 2)]

Notice that Prayer points are divided by 2 before being added to your Hitpoints and Defence. This means every two levels of Prayer provide the same combat impact as one level of Defence or Hitpoints. An odd Prayer level gives no additional combat level progress on its own.

The Offensive Contribution

After calculating your base combat, the formula evaluates your highest offensive category: Melee, Ranged, or Magic. It only takes the single highest value among the three:

• Melee Value: 0.325 × (Attack + Strength)
• Ranged Value: 0.325 × floor(1.5 × Ranged)
• Magic Value: 0.325 × floor(1.5 × Magic)

Your overall combat level is determined by taking your base value, adding the highest of these three offensive values, and rounding the total down to the nearest integer:

Final Combat Level = floor(Base Value + max(Melee, Ranged, Magic))

The Concept of "Free" Combat Levels

Because the formula only counts your dominant attack style, you can often level secondary combat styles without raising your total combat level at all. These are commonly referred to as "free levels" or "virtual padding."

Magic and Ranged on Melee Builds

For an account where (Attack + Strength) is higher than 1.5 × Ranged and 1.5 × Magic, the account is considered melee-based. On a melee-based account, your Ranged and Magic levels do not contribute to your combat level as long as:

Ranged ≤ floor((Attack + Strength) / 1.5)
Magic ≤ floor((Attack + Strength) / 1.5)

For example, a main account with 80 Attack and 80 Strength has a melee sum of 160. Dividing 160 by 1.5 yields 106.6. That player can level both Magic and Ranged up to 99 without adding a single decimal point to their combat level calculation.

Melee Levels on Ranged/Magic Pures

Conversely, if you are building a pure Ranged or Magic build, you can obtain a combined total of Attack and Strength up to 1.5 times your highest stat before those melee stats begin inflating your combat level. For example, a pure with 90 Ranged has an offensive threshold of 135 (90 × 1.5). That account could have 50 Attack and 85 Strength (summing to 135) without their combat level increasing beyond what Ranged already dictates.

Key Combat Milestones in OSRS

While maximizing combat stats is great for general survivability and DPS, specific combat milestones unlock critical content, minigames, and Slayer masters across Gielinor.

1. Pest Control Tiers:
   • Novice Boat: Level 40 combat
   • Intermediate Boat: Level 70 combat
   • Veteran Boat: Level 100 combat (offers the highest Void Knight commendation points per game)
2. Slayer Masters:
   • Mazchna: Level 20
   • Vannaka: Level 40
   • Chaeldar: Level 70
   • Konar quo Maten: Level 75
   • Nieve / Steve: Level 85
   • Duradel: Level 100 (also requires 50 Slayer)
3. Achievement Diaries:
   • Medium Wilderness Diary: Requires 60 combat
   • Hard Wilderness Diary: Requires 85 combat
   • Hard Western Provinces Diary: Requires 100 combat (veteran Pest Control victory)
   • Elite Kandarin Diary: Requires 100 combat
4. Soul Wars & Warriors' Guild:
   • Warriors' Guild: Combined Attack + Strength level of 130, or 99 in either skill
   • Soul Wars: Level 40 combat minimum to enter public games

Combat Optimization for Common PvP Builds

If you are engineering an account for Wilderness PvP, PvP worlds, or Bounty Hunter, combat level management is crucial. You want the highest possible maximum hit within the lowest combat tier.

1-Defence Pures

Pures sacrifice Defence completely to keep their base combat minimal. By staying at 1 Defence, all available combat calculation weight is pushed into offensive skills:

• 50 Attack Pure: Focuses on Granite Maul burst damage. Kept low to dominate brackets between combat 55 and 70.
• 60 Attack Pure: Uses Dragon Dagger (p++) and Dragon Claws for high KO potential. Typically settles around combat 73 to 85.
• 75 Attack Pure: Grants access to the Armadyl Godsword (AGS) and Toxic Staff of the Dead, but brings combat levels closer to bracket boundaries where higher Defence accounts operate.

Zerker Builds (45 Defence)

Berserker pures take 45 Defence to equip the Berserker Helm, Fighter Torso, and Barrows Gloves. This adds roughly 11 base combat levels over a 1-Defence pure with identical stats. To compensate, Zerkers rely on heavy Strength bonuses and Vengeance (requiring 94 Magic and 40+ Defence via Lunar Diplomacy) to out-damage opponents in the 80 to 95 combat range.

Voiders and Meds (70-75 Defence)

Med accounts (often 70 or 75 Defence, 77 Prayer for Rigour/Augury, and 99 Ranged/Magic/Strength) hit combat levels between 103 and 109. This build is widely considered the most efficient all-around bracket in modern OSRS Wilderness deep-wild pking, as it can attack both lower-tier accounts and maxed mains while retaining maximum DPS offensive prayers.

How to Manually Check Your Next Combat Level

If you want to know how close you are to your next level without checking an external website every time, keep these rules of thumb in mind:

• 4 combined levels of Defence and Hitpoints will always grant exactly 1 combat level (since 4 × 0.25 = 1.0).
• 8 levels of Prayer will grant 1 combat level on their own (8 / 2 × 0.25 = 1.0).
• On a melee build, roughly 3 combined levels of Attack and Strength yield 0.975 of a combat level, meaning every 3 to 4 melee levels triggers a combat increase.
• On a ranged/magic build, roughly 2 to 2.5 levels of your dominant stat yield 1 full combat level.

By mapping out your skill goals against these thresholds, you can make sure every quest reward and training session lands your account precisely where you want it to be.