Combat Calculator Osrs

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Reviewed by: Zezima, OSRS Analyst & Veteran Player

The OSRS Combat Level Calculator provides an accurate, real-time assessment of your character’s combat potential based on their current skill levels. Quickly determine your optimal training path and target combat brackets.

OSRS Combat Level Calculator

OSRS Combat Level Formula

The Old School RuneScape combat level is determined by a complex formula that gives weight to five core combat skills plus Hitpoints and Prayer. The final level is floored (rounded down) to the nearest integer.

Step 1: Calculate the Maximum Offensive Base (M)

M_melee = 0.325 × (Attack + Strength)
M_range = 0.325 × (⌊Ranged / 2⌋ + Ranged)
M_magic = 0.325 × (⌊Magic / 2⌋ + Magic)
M = MAX(M_melee, M_range, M_magic)

Step 2: Calculate Combat Level (CB)

CB = FLOOR [ 0.25 × (Defence + Hitpoints) + 0.25 × (⌊Prayer / 2⌋) + M ]

Formula Sources: OSRS Wiki (Combat Level), Runescape Wiki (Calculation Details)

Variables Explained

  • Attack Level: Used in the Melee component (M_melee). Affects accuracy.
  • Strength Level: Used in the Melee component (M_melee). Affects maximum damage.
  • Defence Level: Used in the Base component. Affects defense and contributes to the overall level.
  • Hitpoints Level: Used in the Base component. Directly contributes to the overall level (typically 10 + XP/133.3…).
  • Ranged Level: Used in the Ranged component (M_range). A highly weighted offensive skill.
  • Magic Level: Used in the Magic component (M_magic). A highly weighted offensive skill.
  • Prayer Level: Used in the Base component. Its contribution is halved (⌊P / 2⌋) but essential.

Related OSRS Calculators

What is OSRS Combat Level?

The Combat Level (CB) is a single integer representing a player’s overall combat potential in Old School RuneScape. It dictates which worlds a player can access (F2P vs P2P) and, crucially, defines the combat bracket they fall into for Player-vs-Player (PvP) activities, such as in the Wilderness.

Understanding your Combat Level is vital for player killing (PKing), as the Wilderness only allows players within a certain level range (typically plus or minus the player’s level) to attack each other. Building an “account build” often involves strategically leveling skills to optimize the offensive components while keeping the overall Combat Level low (e.g., a ‘pure’ account).

The combat formula is designed to prioritize offensive skills (Melee, Ranged, Magic) by giving them a weight of 0.325, while defensive/utility skills (Defence, HP, Prayer) contribute only 0.25, ensuring that pure offense is heavily rewarded.

How to Calculate OSRS Combat Level (Example)

Let’s calculate the Combat Level for a character with 60 Attack, 70 Strength, 40 Defence, 70 Hitpoints, 1 Ranged, 1 Magic, and 52 Prayer.

  1. Calculate Defence/HP Base: $0.25 \times (40 \text{ Def} + 70 \text{ HP}) = 0.25 \times 110 = 27.5$
  2. Calculate Prayer Bonus: $0.25 \times \lfloor 52 / 2 \rfloor = 0.25 \times 26 = 6.5$
  3. Calculate Melee Offensive Component: $0.325 \times (60 \text{ Att} + 70 \text{ Str}) = 0.325 \times 130 = 42.25$
  4. Calculate Ranged Offensive Component: Since Ranged is 1, this component is very low (approx. 0.4875).
  5. Calculate Magic Offensive Component: Since Magic is 1, this component is very low (approx. 0.4875).
  6. Find Max Offensive Component (M): $\max(42.25, 0.4875, 0.4875) = 42.25$
  7. Sum Components & Floor: $\lfloor 27.5 + 6.5 + 42.25 \rfloor = \lfloor 76.25 \rfloor = 76$. The Combat Level is 76.

Frequently Asked Questions (FAQ)

What is a ‘pure’ account?

A pure account is a character build that maximizes offensive potential (Attack, Strength, Ranged, Magic) while keeping Defence level 1 to minimize Combat Level, allowing them to fight lower-level opponents in PvP. They have high damage output but low defense.

Does a high Prayer level increase my combat level much?

Prayer level is the least impactful skill on combat level. It contributes $0.25 \times \lfloor \text{Prayer} / 2 \rfloor$, meaning 8 levels of Prayer only increase your combat level by 1. It is a necessary utility skill but a poor choice for maximizing combat level quickly.

What is the maximum combat level in OSRS?

The maximum combat level in Old School RuneScape is 126 (assuming 99 in all skills, including Attack, Strength, Defence, Hitpoints, Ranged, Magic, and 99 Prayer). Levels 127 and 128 were historically possible with Summoning (before OSRS was created).

How much does Hitpoints affect combat level?

Hitpoints (HP) contributes $0.25 \times \text{HP}$ to the combat level base, giving it the same weight as Defence. Since HP naturally rises as you train combat, it is often considered the second most impactful skill on your overall level.

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