Combat Stats (or simply stats or bonuses) are bonuses found in the Worn Equipment section of the interface which are determined by a player's equipment and skills. Combat bonuses are split into two categories: Offensive Stats and Defensive Stats.
All main and offhand weapon bonuses are found in the Offensive Stats section and all armour bonuses are found in the Defensive Stats section. All armour and weapons give a value for each bonus, with the strongest equipment giving the highest bonuses.
Equipment bonuses are highly important to certain aspects of RuneScape such as player killing in Wilderness and fighting in the Duel Arena.
Offensive stats
A player's offensive stats determine how the player will attack in combat.
 Damage  Determines the maximum damage dealt with each hit. A player's Strength, Ranged and Magic contribute to damage, as does some armour and jewellery.
 Accuracy  Determines the chance to land a successful hit. A player's Attack, Ranged, and Magic contribute to accuracy.
 Type  Specifies the weapon's attack type. Available types are stabbing, slashing, and crushing for melee; arrows, bolts, and thrown for ranged; and air, water, earth, and fire for magic.
 Speed  Determines the rate at which one will attack a foe. Available speeds are 'Slowest', 'Slow', 'Average', 'Fast', and 'Fastest'. See Attack speed.
Note: In general, a weapon's damage is a function of its equipment tier and its speed  slower weapons have higher damage. (Its accuracy is a function of its tier only.) If the damage is adjusted for speed  such as when calculating ability damage, though this also applies to autoattacks  weapons of the same tier have the same damage. This means, in general, a higher tier weapon is always more effective than a lower tier one, with higher damage output over time and higher accuracy. The difference between weapons of the same tier is minor, usually coming down to attack type, aesthetics, cost, practicality, or other bonuses (e.g. prayer bonus) and special attacks. This effect (weapons of the same tier having the same averaged damage over time) applies in all combat modes (full manual, revolution, and legacy)  though not necessarily when comparing two different combat modes.
Defensive stats
A player's defensive stats determine their character's endurance.
 Armour rating  Determines the chance to block an enemy attack. A player's Defence level contributes to their armour rating.
 Life Bonus  The amount of life points that is added to a player's base life points. Life bonus is only found on certain highlevel armour.
 Style Bonus  A modifier that affects how your armour rating is used against magic attacks, melee attacks, and ranged attacks, according to the combat triangle. It is based on by the combat class of worn armour.
 Prayer Bonus  Determines the rate at which prayer points are drained. The higher a player's prayer bonus is, the slower the drain. See Prayer#Prayer bonus.
 Damage reduction  Reduces damage received by the shown percentage. The reduction is determined by a player's Defence level and their worn armour. There are two different percentages, one against monsters and the other against players.
Hit and block chance
Formulae
The bonuses on nearly all equipment in the game are derived via formula, and thus one can determine the bonuses of any item, whether it exists or not.
The tier variable is the level of the item. As an example, the rune dagger requires 50 Attack and is tier 50.
The bonuses for armour of many tiers can be found here.
Stats
Accuracy
 Accuracy bonus from Attack/Ranged/Magic: $ \frac{L^3}{1250} + 4L + 40 $ where $ L $ is your level in the respective skill
Armour
 Armour bonus from Defence level: $ \frac{D^3}{1250} + 4D + 40 $
Damage
Where $ L $ is your level in the respective skill (Strength, Ranged, or Magic):
 Damage bonus from skill (mainhand weapon, Fastest speed): $ 2.5L $
 Damage bonus from skill (mainhand weapon, Fast speed): $ 3.125L $
 Damage bonus from skill (mainhand weapon, Average speed): $ 3.75L $
 Damage bonus from skill (offhand weapon, Fastest speed): $ 1.25L $
 Damage bonus from skill (offhand weapon, Fast speed): $ 1.5625L $
 Damage bonus from skill (offhand weapon, Average speed): $ 1.875L $
 Damage bonus from skill (twohand weapon, Fastest speed): $ 3.75L $
 Damage bonus from skill (twohand weapon, Fast speed): $ 4.6875L $
 Damage bonus from skill (twohand weapon, Average speed): $ 5.625L $
Weapons
Accuracy
 Accuracy: $ \left\lfloor 2.5 \left(\frac{t^3}{1250} + 4t + 40\right) \right\rfloor $
$ t $ is the weapon's equipment tier; in most cases, this is the level required to wield it.
Damage
Where $ t $ is the weapon's tier:
 Damage (ammunition): $ \lfloor 9.6t \rfloor $
 Damage (mainhand, Fastest speed): $ \lfloor 9.6t \rfloor $
 Damage (mainhand, Fast speed): $ \lfloor 12.25t \rfloor $
 Damage (mainhand, Average speed): $ \lfloor 14.9t \rfloor $
 Damage (offhand, Fastest speed): $ 4.8t $
 Damage (offhand, Fast speed): $ 6.125t $
 Damage (offhand, Average speed): $ 7.45t $
 Damage (twohanded, Fastest speed): $ 14.4t $
 Damage (twohanded, Fast speed): $ 18.375t $
 Damage (twohanded, Average speed): $ 22.35t $
 Damage (shieldbow, Average speed): $ 5.3t $
 Damage (shortbow, Fast speed): $ 8.775t $
 Damage (twohanded crossbow, Average speed): $ 12.75t $
Armour
(Medium helms, chainbodies, and square shields are calculated using their tier two levels below; to demonstrate, the dragon chainbody is calculated at tier 58.)
Armour bonus
These formulas are for Tank armour and PvP armour. If calculating Power armour, subtract 5 equipment tier; if calculating Hybrid armour, subtract 15 tiers.
 Base: $ f(t) = 2.5 \left(\frac{t^3}{1250} + 4t + 40\right) $
$ t $ is the armour's equipment tier; in most cases, this is the level required to equip it.
 Head: $ 0.2 f(t) $
 Body: $ 0.23 f(t) $
 Legs: $ 0.22 f(t) $
 Shield: $ 0.2 f(t) $
 Gloves: $ 0.05 f(t) $
 Boots: $ 0.05 f(t) $
 Cape: $ 0.03 f(t) $
 Ring: $ 0.02 f(t) $
Life bonus
Note that Life bonus is only found on shields at tiers 70 and above, or Tank armour at tiers 80 and above in the head, body, and leg slots.
Where $ t $ is the armour's tier:
 Head: $ 20 (t  69) $
 Body: $ 40 (t  69) $
 Legs: $ 30 (t  69) $
 Shield: $ 35 (t  69) $
Damage bonus
Only Power armour and PvP armour have a Strength, Ranged, or Magic bonus that is determined by equipment tier.
Where $ t $ is the armour's tier:
 Head: $ 0.25 t $
 Body: $ 0.375 t $
 Legs: $ 0.3125 t $
 Gloves: $ 0.15625 t $
 Boots: $ 0.15625 t $
Damage bonus is also found on many other items, notably jewellery.
Totals
 Accuracy
The displayed accuracy is the sum of the accuracy from stats and weapon accuracy. Accuracy is not scaled to speed or hand.
 Damage
The damage bonus displayed in the loadout interface is the sum of the damage from stats, weapon damage, and damage bonus. Weapon damage is taken asis (since it has already been scaled for speed and handedness), but the other two are scaled:
$ D_{X,\mathrm{scaled}} = D_{X} H S $ Where
 $ D_{X} $ is the unscaled damage, where X is either 'damage from stats' or 'damage bonus'
 $ D_{X,\mathrm{scaled}} $ is the scaled damage for the type
 $ H $ is the handedness multiplier, defined by:
Handedness  $ H $ 

Mainhand  1 
Offhand  0.5 
Twohand  1.5 
 $ S $ is the speed multiplier, defined by:
Speed  $ S $ 

Fastest  1 
Fast  1.2 
Average  1.5 
Note: the damage bonuses calculated here use the unrounded values of the damage, which are not displayed ingame. This results in the damage usually appearing slightly higher than it should.
Hovering over the damage bonus in loadout gives a breakdown of what comes from where.
Affinity and style bonus
All armour has a related affinity, which determines how accurate attacks done against it in each style are. This is represented as style bonus in the equipment stats menu, as a positive number for stronger defence (that style has a lower hit chance), a negative number for weaker defence (that style has a higher hit chance), or zero (that style has a neither boosted nor reduced hit chance).
Trivia
 There was a rest glitch found by resting and then opening up the Equipment Stats interface. This could cause you to stand up but your character still rested in the Equipment Stats interface. It was first noticed on 23 November 2010 and it was patched after the release of the Evolution of Combat.
 When the Evolution of Combat was first released, the armour rating of most equipment varied linearly with level requirement, equal to $ S L $ where L is the level requirement and S is the slot factor (S=20 for helm/shields, 23 for bodies, 22 for legs, 5 for gloves/boots and 3 for capes).
Modes 

Maths 

Equipment 

Mechanics 

Miscellaneous 

Control panel 
 
Minimap 
 
Action bar 
 
Other 
 
Discontinued 
