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Combat Portal
AircraftAerial Combat Day Battle Night Battle PowerNight Battle
LBAS
Jet Assault  · AACI
Battle Opening  · Artillery Spotting  · Anti-Submarine Warfare Cut-In
Support Expedition  · Special Attacks  · Anti-Installation  · Friendly Fleet  · Drop
Map Mechanics and Nodes  · Evacuation  · Damage Calculations  · Accuracy, Evasion and Criticals  · Shooting Order and Targeting

The main goal of the game is to sunk Abyssals. Abyssals are sunk by doing Damage to them. This page lists all the applicable formulas and mechanics that affect the calculation of Damage. The formulas presented on this page are still subject to change as more testing is done.

Please note that all formulas between [math]\displaystyle{ \lfloor \ \rfloor }[/math] or marked with [math]\displaystyle{ \downarrow }[/math] are rounded down.

  • For example, [math]\displaystyle{ \lfloor 4.2 \rfloor = 4 }[/math].
  • [math]\displaystyle{ 4.2 \times_\downarrow 1.5 = \lfloor 4.2 \times 1.5 \rfloor = \lfloor 6.3 \rfloor = 6 }[/math], but [math]\displaystyle{ 4.2 \times_\downarrow 1 = 4.2 }[/math] (by definition, [math]\displaystyle{ \times_\downarrow }[/math] is then a non-commutative non-associative operator, it is assumed to be left-associative with lower priority than the usual multiplication operator).
    • [math]\displaystyle{ \times_\downarrow }[/math] is used when the round down applies only when the modifier is applied.


Damage Formula

The Damage is the reduction of HP Health caused by an attack hitting a target. The formula is the same for all attacks as well as abyssals. It stems from the difference between the final attack power of the assailant and the defence power of the target.

Damage Formula
[math]\displaystyle{ \text{Damage} = \biggl \lfloor \biggl ( \text{Atk}_\text{post-cap} - \text{DEF} \biggr ) \times \text{Ammo} \biggr \rfloor }[/math]

With:

  • [math]\displaystyle{ \text{Atk}_\text{post-cap} }[/math] the final attack power of the assailant after the cap and all the modifers have been applied,
  • [math]\displaystyle{ \text{DEF} }[/math] the defensive power of the target,
  • [math]\displaystyle{ \text{Ammo} }[/math] the remaining ammunition modifier.

Defense Power

Defence power represent the ability of a ship to resist damage. It's calculated from the Armor Armor plus a random element.

Defence Formula
[math]\displaystyle{ \text{DEF} = \left( \text{Armor} \times 0.7 + \text{Armor}_\text{rand} \times 0.6 \right) - \text{Pen} }[/math]

With:

  • [math]\displaystyle{ \text{Armor} }[/math] is the armor Armor of the target including all equipment and upgrade bonuses.
  • [math]\displaystyle{ \text{Armor}_\text{rand} }[/math] is a random number between [math]\displaystyle{ 0 }[/math] and [math]\displaystyle{ \lfloor\text{Armor}\rfloor - 1 }[/math]
    • Note that it is inclusive, meaning it can also output [math]\displaystyle{ 0 }[/math] and [math]\displaystyle{ \lfloor\text{Armor}\rfloor - 1 }[/math]
  • [math]\displaystyle{ \text{Pen} }[/math] is any applicable armor penetration mechanic:
    • See ASW for details on ASW armor penetration,
    • Some debuffs may include armor penetration.

Note:

  • The range of armor values is uniformly distributed, every armor roll has the same chance of occurring.

For short, defensive power randomly varies between 1.3 xArmor and 0.7 xArmor.

Attacks Power

Attack power represent the ability of a ship to inflict damage. It's affected by a lot of different elements (stats, mechanics, "battle state", etc.) through 4 steps of calcul:

  1. Basic
    • Generally calculated from the relevent stats of the ship using different formula according to the type of attack and the phase of battle
  2. Pre-cap
    • The basic attack go through different modifiers
  3. Cap
    • If the attack si superior to a cap it's reduced
  4. Post-cap
    • These modifiers are more potent because they are not limited by the cap
Attack Step Formulas
Pre-cap
[math]\displaystyle{ \text{Atk}_\text{pre-cap} = \text{Atk}_\text{base} \times \text{Mod}_\text{pre-cap} }[/math]

With:

  • [math]\displaystyle{ \text{Atk}_\text{base} }[/math] is the basic attack power of the relevant attack.
  • [math]\displaystyle{ \text{Mod}_\text{pre} }[/math] is any pre-cap modifiers that are applicable.
Cap

The attack is then capped as follows:

[math]\displaystyle{ \text{Atk}_\text{cap} = \text{Cap} + \sqrt{\text{Atk}_\text{pre-cap} - \text{Cap}} }[/math]

With:

  • [math]\displaystyle{ \text{Cap} }[/math] is the damage cap relevant to the phase.
[math]\displaystyle{ Cap }[/math]
Attack Type Cap
Support Expeditions 170
ASW
Airstrike
Opening Torpedo Salvo 180
Closing Torpedo Salvo
LBAS 220 [1]
Day shelling
Night battle 360
Post-cap

Capped attack is then modified by post-cap modifiers:

[math]\displaystyle{ \text{Atk}_\text{post-cap} = \lfloor \text{Atk}_\text{cap} \rfloor \times \text{Mod}_\text{spotting} \times \text{Mod}_\text{CVCI} \times_\downarrow \text{Mod}_\text{AP} \times \text{Mod}_\text{post} \times_\downarrow \text{Crit} }[/math]

With:

  • [math]\displaystyle{ \text{Atk}_\text{cap} }[/math] the Cap Adjusted Attack Power,
  • [math]\displaystyle{ \text{Mod}_\text{spotting} }[/math] the bonus from artillery spotting,
  • [math]\displaystyle{ \text{Mod}_\text{CVCI} }[/math] the bonus from carrier cut-ins,
  • [math]\displaystyle{ \text{Mod}_\text{AP} }[/math] the bonus from AP shells,
    • The value is rounded down after applying [math]\displaystyle{ \text{Mod}_\text{AP} }[/math] only if the target is able to take extra damage from AP shells, even if [math]\displaystyle{ \text{Mod}_\text{AP} }[/math] is 1 due to the attacker not having AP shells.
  • [math]\displaystyle{ \text{Mod}_\text{post} }[/math] any remaining post-cap modifiers that are applicable,
  • [math]\displaystyle{ \text{Crit} }[/math] the critical strike modifier,
    • The value is rounded down after applying [math]\displaystyle{ \text{Crit} }[/math] only if the attack is critical.

Basic Attack Power Formulas

The following section details the differents formulas to calculate [math]\displaystyle{ \text{Atk}_\text{base} }[/math]. As the formula depend of the type of attacksand the combat phase.

Below are the common variables used in all accuracy formulas:

  • [math]\displaystyle{ \text{FP} }[/math] is the Firepower Firepower of the ship including equipment.
  • [math]\displaystyle{ \text{TP} }[/math] is the Torpedo Torpedo Attack of the ship including equipment or the torpedo of a plane.
  • [math]\displaystyle{ \text{ASW} }[/math] is the Anti-submarine Anti-Submarine Warfare of the ship or equipment.
  • [math]\displaystyle{ \text{DB} }[/math] is the Dive bombing Dive Bomber Attack of the plane.
  • [math]\displaystyle{ \bigstar }[/math] is the upgrade bonus of the equipment.
  • [math]\displaystyle{ \text{Plane}_\text{Count} }[/math] is the remaining amount of planes in a slot, performing the attack.
  • [math]\displaystyle{ \text{Mod}_\text{CF} }[/math] is the combined fleet modifier based on the tables below:

Combat Phase Forces Carrier Task Force Surface Task Force Transport Escort Force
Main Fleet Shelling Allies +2 +10 -5
Enemy +10 +5 +10
Escort Fleet Shelling Allies +10 -5 +10
Enemy +5 -5 +5
Torpedo Allies -5 -5 --5
Enemy -5 -5 -5

Combat Phase Forces Carrier Task Force Surface Task Force Transport Escort Force
Main Fleet Shelling Allies +2 +2 -5
Enemy +10 +10 +10
Escort Fleet Shelling Allies -5 -5 -5
Enemy -5 -5 -5
Torpedo Allies +10 +10 +10
Enemy +10 +10 +10

Combat Phase Forces Bonus
Vs Main Fleet Allies +5
Enemy +10
Vs Escort Allies +5
Enemy -5
Torpedo Allies +10
Enemy +10

Airstrike

Airstrike Attack Formula
[math]\displaystyle{ \text{Atk}_\text{base airstrike} = \text{Type} \times \biggl( \left( \text{DB or TP} + \bigstar \right) \times \sqrt{\text{Plane}_\text{Count}} + 25 \biggr) }[/math]

with:

  • [math]\displaystyle{ \text{Type} }[/math] is a multiplier based on the type of the plane. See below for details.
[math]\displaystyle{ \text{Type} }[/math]
Plane Type Multiplier Notes
Torpedo Bomber Torpedo Bombers 0.8x or 1.5x The multiplier is chosen randomly.
The chance is roughly 50%.
Dive Bomber
Seaplane BomberBomber
Dive Bombers
Seaplane Bombers
1.0x
JetFighterBomber2.png
JetFighterBomber1.png
Jets
(During jet assault)
1.0x
Jets
(During normal bombing)
0.7071x

This applies to Jet Assaults and Airstrikes.

Notes
  • Airstrike power is calculated independently for each equipment slot on the carrier.
  • The firepower of the carrier does not affect airstrike power.
  • The power is calculated after the air combat and anti-air fire phases which means bombers getting shot down will affect the final calculation.
  • It is not affected by engagement, formation or damage states.
  • It is affected by contact.

Surface Shelling

Surface Attack Formula
[math]\displaystyle{ \text{Atk}_\text{base shelling} = \text{FP} + \bigstar + \text{Mod}_\text{CF} + 5 }[/math]

This applies to most ship during the shelling phase.

Notes:

  • The caliber of the gun does not affect damage.
  • Abyssal installations that are not equipped with a plane that has a torpedo or dive bombing stat will use the surface shelling formula for calculating damage.

Carrier Shelling Attacks

Carrier Shelling Attack Formula
[math]\displaystyle{ \text{Atk}_\text{base carrier shelling} = \bigl\lfloor \left( \text{FP} + \text{TP} + \bigstar + \left[ \text{DB} \times 1.3 \right] + \text{Mod}_\text{CF} \right) \times 1.5 \bigr\rfloor + 55 }[/math]

This applies to carriers and Hayasui KaiHayasui Kai/Yamashio Maru KaiYamashio Maru Kai during the shelling phase.

Notes:

  • Dive and Torpedo groups contribute, respectively, 1.95 and 1.5 times their dive bomb and torpedo stats towards shelling power
  • If a carrier is not equipped with any torpedo or dive bombers, she will not participate in shelling.
    • This also applies if they have lost all bombers during the aerial combat phase.
    • But even if an air group has had all its planes shot down, it will still contribute towards carrier shelling power (if the CV is still capable of attacking).
  • Remember that there are potentially multiple sources of [math]\displaystyle{ \bigstar }[/math] bonuses.
  • Slot sizes and the number of remaining aircraft do not affect carrier attack power during shelling.
  • Carriers have the easiest time hitting the damage cap. This makes them very powerful assets for the fleet.
  • Abyssal installations equipped with a plane that has a torpedo or dive bombing stat will use the carrier formula for determining shelling damage.
  • Planes are not shot down when a carrier participates in shelling

Torpedo Attacks

Torpedo Attack Formula
[math]\displaystyle{ \text{Atk}_\text{base torpedo} = \text{TP} + \bigstar + \text{Mod}_\text{CF} + 5 }[/math]

Torpedo Attacks only include the Opening Torpedo Salvo and Closing Torpedo Salvo.

Notes
  • Submarines and Abyssal installations cannot be targeted by torpedoes.
    • If the only available targets are submarines, the attack will trigger but always miss.
    • If the only available targets are installations, the attack will not trigger.
  • A ship must have a base torpedo stat of more than 0 to perform torpedo attacks.

Anti-Submarine Warfare

The stats used to calculate damage against submarines is the Anti-Submarine Warfare ASW.

  • When contributing to ASW power, Base Anti-Submarine Warfare ASW is square rooted, while equipment ASW is multiplied by 1.5.
    • Anti-submarine weaponry is therefore the primary source of ASW damage, with the base ship ASW playing a very minor role damage-wise.
    • However, base ship ASW is the primary determinant of whether a ship can reach 100 total ASW to perform "Opening ASW" (OASW) attacks.
  • Unlike shelling, ASW damage is capped at 170.

ASW attacks have different modifiers gained from Formations,

Anti-Submarine Formula
[math]\displaystyle{ \text{Atk}_\text{base ASW} = \left( 2\sqrt{\text{ASW}_\text{ship} } + 1.5 \times \bigg[ \sum_\text{All Equipment} (\text{ASW}_\text{equip} + \uparrow \text{ASW}_\text{fit bonus} ) \bigg] + \bigstar + \text{Type}_\text{ship} \right) \times \text{Mod}_\text{synergy} }[/math]
With
  • [math]\displaystyle{ \text{ASW}_\text{equip} }[/math] is the Anti-Submarine Warfare stat of anti-submarine equipment and attack planes.
  • [math]\displaystyle{ \uparrow \text{ASW}_\text{fit bonus} }[/math] unlike [math]\displaystyle{ \text{ASW}_\text{equip} }[/math] this is the Anti-Submarine Warfare from Fit Bonuses of all equipment.
  • [math]\displaystyle{ \text{Type}_\text{ship} }[/math] a constant depending on the type of the ship performing the attack. See below for details.
Ship Type Constant
Ship Types [math]\displaystyle{ \text{Type}_\text{ship} }[/math]
Coastal Defense Ships (DE)
Destroyers (DD)
Light Cruisers (CL/CT)
Oilers (AO) (without carrier bomber)
13
Aviation Cruisers (CAV)
Aviation Battleships (BBV)
Seaplane Tenders (AV)
Light Carriers (CVL)
Landing Ships (LHA)
Oilers (AO) (with carrier bomber)
8
  • [math]\displaystyle{ \text{Mod}_\text{synergy} }[/math] the synergy multiplier bonus from using certain combinations of ASW equips (see below).
Notes
  • The bonuses do not stack, meaning only the highest possible bonus applies.
    • The exception is the depth charge penetration detailed above.
  • Multiple equipments of the same type still only apply the bonus once.
  • There is an accuracy bonus as well but it is small. Stacking sonars will give a bigger accuracy bonus.


Surface Night Battle

Night Attack Formula
[math]\displaystyle{ \text{Night Battle Power} = \text{FP} + \text{TP} + \bigstar + \text{Mod}_\text{contact} }[/math]

With:

  • [math]\displaystyle{ \text{Mod}_\text{contact} }[/math] is the Night Battle Contact if Night Reconnaissance Seaplane Night Recon is triggered. The value depend of the Accuracy Accuracy:
    • 5 for 1 Accuracy,
    • 7 for 2 Accuracy.

This applies to most ships during Night Battle.

Notes

Carrier Night Air Attacks

Carrier Night Air Attack Formula
[math]\displaystyle{ \text{Night Battle Power}_\text{carrier} = \text{FP}_\text{ship} + \sum_\text{All Night Planes} \text{FP}_\text{night plane} + \text{TP}_\text{night plane} + \text{DB}_\text{night plane} + \text{Night Plane Bonus} }[/math]

With:

[math]\displaystyle{ \text{Night Plane Bonus} = \mathrm{A} \times \text{Plane}_\text{Count} + \mathrm{B} \times \left( \text{FP}_\text{night plane} + \text{TP}_\text{night plane} + \text{DB}_\text{night plane} + \text{ASW}_\text{night plane} \right) \times \sqrt{\text{Plane}_\text{Count}} + \sqrt{\bigstar} }[/math]


This applies to Night Carriers (CVN) are CV/CVL capable of Carrier Night Air Attacks without needing a Aviation Personnel NOAPNight Operation Aviation Personnel
Night Operation Aviation Personnel + Skilled Deckhands
.

Notes
  • Unlike daytime carrier attacks, it is possible to attack even if no bombers are equipped.
    • Night fighters are still needed to trigger the attack.
  • Like daytime carrier attacks, carriers are unable to attack if moderately damaged or worse.
    • Armored carriers are only disabled at heavy damage.
    • Carriers that can use the night battle shelling formula will use that instead if moderately damaged.
  • The formula only takes into account the base stats of the carrier and night attack capable planes equipped.
    • The Improvement stats are not taken into account.
      • This means any other stats and upgrade bonuses from equipment like guns and non-night-capable planes are ignored.
    • This also means that any Visible Bonus from Planes is also ignored.

Anti-Installation Attacks

Installations differ from regular enemy warships, as they are immune to certain attack elements like the torpedo stat, but are extremely weak against specialized gears.

Support Expedition Attack Power Formula

Support expedition attack formula are close but not the same as combat formula. They also are affected by less modifiers.

Shelling Support

Basic attack power is calculated in the same way as normal for surface ships and carriers except that firepower is reduced by 1.

Airstrike Support

Airstrike Support Attack Formula
[math]\displaystyle{ \text{Airstrike Support} = \biggl\lfloor \biggl\{ \text{Type} \times \bigl( \left( \text{DB or TP} \right) \times \sqrt{\text{Count}_\text{Plane}} + 3 \bigr) \biggr\} \times \text{Mod}_\text{crit} \biggr\rfloor \times 1.35 }[/math]
Note
  • The damage cap of 170 is applied to the result between [math]\displaystyle{ \{ \ \} }[/math].
  • [math]\displaystyle{ \text{Type} }[/math] is the bomber's type modifier, similar to airstrikes.
    • [math]\displaystyle{ 1.0 }[/math] for dive bombers and seaplane bombers.
    • Either [math]\displaystyle{ 0.8 }[/math] or [math]\displaystyle{ 1.5 }[/math] for torpedo bombers.
  • The critical modifier and the 1.35x airstrike support modifier are both post-cap.

Anti-Submarine Support

Anti-Submarine Support Attack Formula
[math]\displaystyle{ \text{ASW Support} = \biggl\lfloor \biggl\{ \bigl(\text{ASW} \times \sqrt{\text{Count}_\text{Plane}} + 3 \bigr) \times \left(0.9 + \text{Rand} \right) \biggr\} \times \text{Mod}_\text{crit} \biggr\rfloor \times 1.35 }[/math]

With:

  • [math]\displaystyle{ \text{Rand} }[/math] is a random number from 0 to 0.75 inclusive.
  • The critical modifier and the 1.35x airstrike support modifier are both post-cap.
  • The damage cap of 170 is applied to the result between [math]\displaystyle{ \{ \ \} }[/math].
Notes
  • Because slot size matters, carriers make much better ASW support ships than light carriers.
  • It has a chance of triggering at every node so consider the enemy compositions of all nodes when running ASW support to help with submarine nodes.
    • A full ASW support setup that runs into enemy airpower will get destroyed.
  • Because even the autogyros and liaison aircraft participate in aerial combat, they can be shot down.
  • It can be useful for chipping down submarines to reduce the number of opening and closing torpedoes faced by the fleet.

Long Range Torpedo Support

Long Range Torpedo Attack Formula
[math]\displaystyle{ So useless nobody bothered to note the formula (TT-TT) }[/math]

LBAS Attack Power Formulas

Attack Power Corrections

After calculating the basic attack power of the attack being made, it is then adjusted based on various factors. Attack power modifiers can be split into pre- and post-cap modifiers. Post-cap modifiers are more powerful to have because they aren't reduced by the cap.

Pre-cap Modifiers

Engagement

Form Common name Damage Modifier Chance Chance with SaiunSaiun
Saiun (Eastern Caroline Air Group)
Saiun (4th Recon Squad)
Crossing the T (Advantage)
T字戦有利 (T Ji-sen Yuuri?)
Green T 1.2 15% 15%
Parallel Engagement
同航戦 (Doukousen?)
Parallel 1.0 45% 45%
Head-on Engagement
反航戦 (Hankousen?)
Head-on 0.8 30% 40%
Crossing the T (Disadvantage)
T字戦不利 (T Ji-sen Furi?)
Red T 0.6 10% 0%

Formation

Formation Attack Power Modifiers
Formation Shelling Torpedo ASW Night Battle
Line Ahead
単縦陣 Tanjuu-jin
1.0 1.0 0.6 1.0
Double Line
複縦陣 Fukujuu-jin
0.8 0.8 0.8 1.0
Diamond
輪形陣 Rinkei-jin
0.7 0.7 1.2 1.0
Echelon
梯形陣 Teikei-jin
0.75 0.6 1.1 1.0
Line Abreast
単横陣 Tan'ou-jin
0.6 0.6 1.3 1.0
Vanguard
警戒陣|Keikai-jin
0.5 1.0 1.0 0.5
1.0 1.0 0.6 1.0

The following tab resume when engament and formation are effective:

Modifier LBAS Airstrike Support Shelling Torpedo ASW Night Battle
Shelling Aerial Torpedo Surface Carrier
Engagement ✔️ ✔️ ✔️ ✔️ ✔️ ✔️ ❌*
Formation ✔️ ✔️ ✔️ ✔️ ✔️ ✔️ ✔️

Damage State

Damage State Shelling Torpedo ASW
Not Damaged 1.0 1.0 1.0
Lightly Damaged (小破)
Moderately Damaged (中破) 0.7 0.8 0.7
Heavily Damaged (大破) 0.4 0 0.4
Notes
  • Damage state does not affect aerial combat.
    • It will affect carrier attacks in the shelling phase.

Night Battle Cut-In

Night Cut-Ins will apply extra modifiers if triggered.

[math]\displaystyle{ \text{Mod}_\text{CI} }[/math]
"New" Cut-ins
Attack Type Prerequisites Notes Damage
Modifier
Destroyer Cut-ins TorpedoesSmall Caliber Main GunSurface RADARSurface 1.3
With 12.7cm Mod D K212.7cm Twin Gun Mount Model D Kai 2 1.625
With 12.7cm Mod D K312.7cm Twin Gun Mount Model D Kai 3 1.706
With 2 12.7cm Mod D K212.7cm Twin Gun Mount Model D Kai 2 1.820
With both 12.7cm Mod D K212.7cm Twin Gun Mount Model D Kai 2 & K312.7cm Twin Gun Mount Model D Kai 3 1.911
With 2 12.7cm Mod D K312.7cm Twin Gun Mount Model D Kai 3 2.002
TorpedoesSurface RADARSurfaceLookout 1.2
With 12.7cm Mod D K212.7cm Twin Gun Mount Model D Kai 2 1.5
With 12.7cm Mod D K312.7cm Twin Gun Mount Model D Kai 3 1.575
With 2 12.7cm Mod D K212.7cm Twin Gun Mount Model D Kai 2[1] 1.680
With both 12.7cm Mod D K212.7cm Twin Gun Mount Model D Kai 2 & K312.7cm Twin Gun Mount Model D Kai 3[1] 1.768
With 2 12.7cm Mod D K312.7cm Twin Gun Mount Model D Kai 3[1] 1.848?
TorpedoesTorpedoesEquipment Card Torpedo Squadron Skilled Lookouts.png Requires TSLOTorpedo Squadron Skilled Lookouts 1.5
TorpedoesDrum CanisterEquipment Card Torpedo Squadron Skilled Lookouts.png Requires TSLOTorpedo Squadron Skilled Lookouts 1.3
Carrier Cut-ins[2] Night FighterNight FighterNight Bomber Wildcard = Night FighterNight BomberNight-capable Dive BomberDive-bomber or Torpedo Bomber 1.25
Night FighterNight Bomber 1.2
Night FighterNight-capable Dive Bomber
OR
Night Bomber Night-capable Dive Bomber
1.2
Night FighterWildcard Wildcard 1.18
Night Zuiun Cut-ins Large Caliber Main GunLarge Caliber Main GunNight Seaplane BomberNight Seaplane BomberSurface RADARSurface - 1.36
Large Caliber Main GunLarge Caliber Main GunNight Seaplane BomberNight Seaplane Bomber 1.32
Large Caliber Main GunLarge Caliber Main GunNight Seaplane BomberSurface RADARSurface 1.28
Large Caliber Main GunLarge Caliber Main GunNight Seaplane Bomber 1.24
[math]\displaystyle{ \text{Mod}_\text{CI} }[/math]
"Old" Cut-ins
Attack Type Prerequisites Accuracy
Modifier
Gun Cut-in Large Caliber Main GunLarge Caliber Main GunLarge Caliber Main Gun 2
Mixed Gun Cut-in Large Caliber Main GunLarge Caliber Main GunSecondary Gun 1.75
Submarine Cut-ins Late Model Submarine TorpedoesSub_LM Submarine Equipment 1.75
Late Model Submarine TorpedoesSub_LM Late Model Submarine TorpedoesSub_LM 1.6
Torpedo Cut-in TorpedoesTorpedoes 1.5
Mixed Torpedo Cut-in TorpedoesLarge Caliber Main Gun 1.3
Double Attack Large Caliber Main GunLarge Caliber Main Gun 1.2
Large Caliber Main GunSecondary Gun
Secondary GunSecondary Gun

ASW Synergy

ASW Damage Synergy
Small SONARSmall Small Sonars
Equipment Card Type 93 Passive Sonar.png
Type 93 Passive Sonar
Equipment Card Type 4 Passive Sonar.png
Type 4 Passive Sonar
Equipment Card Type 3 Active Sonar.png
Type 3 Active Sonar
Equipment Card Type 3 Active Sonar Kai.png
Type 3 Active Sonar Kai
Equipment Card Type124 ASDIC.png
Type124 ASDIC
Equipment Card Type144 147 ASDIC.png
Type144/147 ASDIC
Equipment Card HF DF + Type144 147 ASDIC.png
HF/DF + Type144/147 ASDIC
Large SONARLarge Large Sonars
Equipment Card Type 0 Passive Sonar.png
Type 0 Passive Sonar
Depth Charge ProjectorDCP Depth Charge Projectors (DCP)
Equipment Card Type 94 Depth Charge Projector.png
Type 94 Depth Charge Projector
Equipment Card Type 3 Depth Charge Projector.png
Type 3 Depth Charge Projector
Equipment Card Type 3 Depth Charge Projector (Concentrated Deployment).png
Type 3 Depth Charge Projector (Concentrated Deployment)
Equipment Card Prototype 15cm 9-tube ASW Rocket Launcher.png
Prototype 15cm 9-tube ASW Rocket Launcher
Equipment Card RUR-4A Weapon Alpha Kai.png
RUR-4A Weapon Alpha Kai
AP
Equipment Card Mk.32 ASW Torpedo (Mk.2 Thrower).png
Mk.32 ASW Torpedo (Mk.2 Thrower)
AP
Depth Charge RacksDCR Depth Charge (Racks) (DCR)
Equipment Card Type 95 Depth Charge.png
Type 95 Depth Charge
AP
Equipment Card Type 2 Depth Charge.png
Type 2 Depth Charge
AP
Equipment Card Lightweight ASW Torpedo (Initial Test Model).png
Lightweight ASW Torpedo (Initial Test Model)
AP
Equipment Card Hedgehog (Initial Model).png
Hedgehog (Initial Model)
AP
Equipment Card Type 2 Depth Charge Kai 2.png
Type 2 Depth Charge Kai Ni
AP
ASW MortarOther ASW Mortars
Equipment Card Type 2 12cm Mortar Kai.png
Type 2 12cm Mortar Kai
Equipment Card Type 2 12cm Mortar Kai (Concentrated Deployment).png
Type 2 12cm Mortar Kai (Concentrated Deployment)
ASW Damage Modifiers: [math]\displaystyle{ \text{Mod}_\text{synergy} = {Mod}_\text{1} \times {Mod}_\text{2} }[/math]
[math]\displaystyle{ {Mod}_\text{1} }[/math] SONAR + Depth Charges
(Any Sonar + Any Depth Charge)
1.15
[math]\displaystyle{ {Mod}_\text{2} }[/math] Depth Charge ProjectorDCP + Depth Charge RacksDCR and NO Small SONARSmall 1.1
Small SONARSmall + Depth Charge ProjectorDCP + Depth Charge RacksDCR 1.25
Examples
[math]\displaystyle{ \text{Mod}_\text{synergy} }[/math] Small SONARSmall + Depth Charge ProjectorDCP + Depth Charge RacksDCR 1.4375[math]\displaystyle{ 1.15 \times 1.25 }[/math]
Large SONARLarge + Depth Charge ProjectorDCP + Depth Charge RacksDCR 1.265[math]\displaystyle{ 1.15 \times 1.1 }[/math]
Armor Penetration
Indepentant of synergies, some equipment provides additional armor penetration to ASW attacks.

The flat armor penetration value is calculated as follows:

[math]\displaystyle{ \text{Pen} = \sum\limits_{\text{Equipment}} \Big( \sqrt{\text{ASW}_\text{Equipment} - 2} + \text{Mod}_\text{ship} \Big) }[/math]
With
  • [math]\displaystyle{ \text{ASW}_\text{Equipment} }[/math] the base ASW Anti-Submarine Warfare stat of the applicable equipment,
  • [math]\displaystyle{ \text{Mod}_\text{ship} }[/math] being 1 for DE, 0 otherwise,
Note
  • Armor penetration from equipment stacks,
  • The final armor of the targetted submarine cannot go below 1.

Hidden Fit Bonuses

Unlike the other pre-cap bonuses, this is just a minor additive firepower bonus added for some ships (mostly cruisers) when equipped with certain guns.

Post-cap Modifiers

Aerial Contact

During aerial combat, there is a chance for the ships to trigger Contact. When it is triggered, the is a bonus multiplier applied to airstrike damage depending on the Accuracy Accuracy of the plane that triggered contact.

Accuracy Accuracy Damage Modifier
0 1.12
1 1.12
2 1.17
3+ 1.2

Airstrike Special Bonus

There's a bonus when attacking certain Princess and Demon-type enemies during airstrike. The multiplier is chosen randomly between two values. The chance is roughly 50%.

[math]\displaystyle{ \text{Mod}_\text{boss} }[/math][3]
Boss (ID) Low mod High mod
PT Imp (1637-1640)PT Imp Pack 0.5 0.8
BB Hime (1557)Battleship Princess 1.4? 2.2?
Summer BB Hime (1696-1698)Battleship Summer Princess ? ?
CV Hime (1586)Aircraft Carrier Princess 1.7? 2.2?
CV Hime B (2105-2108)Aircraft Carrier Princess B 1.7? 2.2?

Artillery Spotting

Attack Type Prerequisites Post-cap
Damage
Modifier
Notes
Main Zuiun Cut-in
(Zuiun CI)
Large Caliber Main GunZuiun Model Seaplane BomberZuiun Model Seaplane Bomber 1.35 Ise-class Kai NiIse Kai Ni
Hyuuga Kai Ni
only
Main Suisei Cut-in
(Suisei CI)
Large Caliber Main GunDive BomberDive Bomber 1.3
Main AP Shell Cut-in
(APCI)
Large Caliber Main GunLarge Caliber Main GunSeaplaneArmor-Piercing Shell 1.5
Secondary AP Shell Cut-in
(Sec APCI)
Large Caliber Main GunSecondary GunSeaplaneArmor-Piercing Shell 1.3
Secondary Radar Cut-in
(Radar CI)
Large Caliber Main GunSecondary GunSeaplaneRADAR 1.2
Secondary Cut-in
(Sec CI)
Large Caliber Main GunSecondary GunSeaplane 1.1
Double Attack
(DA)
Large Caliber Main GunLarge Caliber Main GunSeaplane 1.2

Carrier Cut-In Attacks

Attack Type Prerequisites Post-cap
Damage
Modifier
Fighter-Bomber-Attacker
(FBA)
FighterDive BomberTorpedo Bomber 1.25
Bomber-Bomber-Attacker
(BBA)
Dive BomberDive BomberTorpedo Bomber 1.2
Bomber-Attacker
(BA)
Dive BomberTorpedo Bomber 1.15

Armor-Piercing Modifier

During day combat, certain enemy ships take extra damage from Armor-Piercing Shell AP ShellsType 91 Armor Piercing Shell
Type 1 Armor Piercing Shell
Type 1 Armor Piercing Shell Kai
.

  • The bonus only applies against FBB, BB, BBV, CV, CVB, CA, and CAV.
    • This includes Installations.
    • This means that this bonus does not apply against all other types, namely CVL, CL(T), CT, DD, DE, SS(V), AV, AS, AR, LHA, or AP.
Type Modifier
Large Caliber Main GunArmor-Piercing Shell 1.08
Large Caliber Main GunArmor-Piercing ShellRADAR 1.10
Large Caliber Main GunArmor-Piercing ShellSecondary Gun 1.15
Large Caliber Main GunArmor-Piercing ShellSecondary GunRADAR 1.15
Note
  • It is unadvisable to run any of the other setups beyond the most basic Gun+AP, as the other setups will interfere with artillery spotting and give worse bonuses.

Anti-Installation Equipment Modifiers

Special Attack Bonus

Critical Strikes

For more details on how critical chance is calculated, please see Accuracy, Evasion and Criticals.

Normal Criticals
Attack Type Modifier
Normal 1.0
Critical [math]\displaystyle{ 1.5 \times \text{Mod}_\text{proficiency} }[/math]
Plane Proficiency Critical Modifier

Carriers get a bonus critical modifier when equipped with high proficiency planes. This modifier is multiplicative with the normal critical modifier.

  • For Carrier Attacks, they gain a 1.2 critical bonus multiplier for a ❱❱ plane in the top slot and an additional 0.1 for every other ❱❱ plane.
    • For example, a carrier with two max proficiency planes (with one in the top slot) would get a critical bonus of: (1.2 + 0.1) x 1.5 = 1.95.
  • For Carrier Cut-In Attacks, they gain a 1.106 bonus when a ❱❱ plane is selected to participate in the attack and an additional +0.15 if one of the selected planes is in the top slot.

Ammunition Modifier

The damage of the fleet is reduced once their ammunition falls below 50%. This modifier cannot go above 1. The formula use to determine this is:

[math]\displaystyle{ \text{Ammo} }[/math] formula
[math]\displaystyle{ \text{Ammo} = \dfrac{\Big\lfloor \dfrac{\text{Current Ammo}}{\text{Max Ammo}} \times 100 \Big\rfloor}{50} }[/math]

With:

  • [math]\displaystyle{ \text{Current Ammo} }[/math] is the current ammo of the ship.
  • [math]\displaystyle{ \text{Max Ammo} }[/math] is the max ammo of the ship (indicated under consuption on the ship info).
Remaining Ammo Ammo Modifier Notes
>50% 1.0
40~49% 0.8 4th Battle
30~39% 0.6
20~29% 0.4 5th Battle
10-19% 0.2
0% 0 6th Battle
  • The battle number indicated in the notes assumes only normal surface engagements. Engaging in night battles and other special engagements can change that number.
  • Whatever ammunition modifier applies in day battle carries over to night battle.
  • Maelstroms that reduce ammunition also count towards this modifier.
  • Using Supplies Underway ReplenishmentUnderway Replenishment is a way to medigate ammo penalties.
  • The ammunition modifier affects aerial battle.
  • Once a ship hits 0% ammo, all attacks become scratch damage.
  • Debuffs are affected by the ammunition modifier.

Miscellaneous Damage Modifiers

Scratch Damage

If a Cut-in or a special attack is evaded, the target's armor cannot be penetrated, or the ammo count hits 0; attacks will deal "scratch damage" instead, also called "chip damage".

  • Scratch damage is dealt as a percentage of remaining HP calculated using the following formula:
Scratch Damage formula
[math]\displaystyle{ \text{Damage}_\text{scratch} = \text{HP}_\text{current} \times 0.06 + \text{HP}_\text{rand} \times 0.08 }[/math]

With:

  • [math]\displaystyle{ \text{HP}_\text{current} }[/math] is the current HP Health of the target.
  • [math]\displaystyle{ \text{HP}_\text{rand} }[/math] is a random HP number between 0 and [math]\displaystyle{ \text{HP}_\text{current} - 1 }[/math]

Therefore the maximum possible scratch damage [math]\displaystyle{ \text{HP}_\text{current} \times 0.14 - 0.08 }[/math] and the minimum damage is [math]\displaystyle{ \text{HP}_\text{current} \times 0.06 }[/math].

  • If the target's HP is low, it is possible for the result of the formula to return a result of 0. Remember that all formulas are rounded down.
    • This means the target's HP cannot be reduced to 0 by scratch damage.
Friendly Fleet

A Friendly Fleet cannot kill the last ship of the opposing fleet it will dealt special scratch damage instead.

[math]\displaystyle{ \text{Overkill} = \text{HP}_\text{current} \times 0.5 }[/math]
  • Scratch damage is generally between 6-14% of current HP.

The target's HP cannot be reduced to 0 (and therefore sunk) by scratch damage.

PT Imps

Anti-PT boat
Unlike most standard Abyssals, "PT boats" (PT Imp PackPT Imp Pack & Schnellboot Imp PackSchnellboot Imp Pack) are "very small and fast".
  • All ship types suffer a severe Accuracy accuracy and Firepower firepower penalty against PT boats.
  • Attacking them with larger guns is not very effective, smaller guns being recommended instead.
  • Support Expeditions are not affect by any of the following[1].
Attack formula against PT boats
The Attack formula against PT boats:[2][3]
Jet Assault & Airstrike
  • [math]\displaystyle{ \text{Damage}_\text{PT}= \text{Atk}_\text{post-cap} \times \text{Rand} [0.5 ; 0.8] }[/math]


LBAS[4]
  • [math]\displaystyle{ \text{Damage}_\text{PT}= \text{Atk}_\text{post-cap} \times \text{Rand} [0.4 ; 0.7] }[/math]


Shelling
  • [math]\displaystyle{ \text{Damage}_\text{PT}= ( 0.3 \times \text{Atk}_\text{post-cap} + \sqrt{\text{Atk}_\text{post-cap}} + 10 ) \times \prod^{All Equipment}{\text{Mod}_\text{EquipmentAtk}} }[/math]


Opening & Closing Torpedo Salvos
  • [math]\displaystyle{ \text{Damage}_\text{PT}= 0.3 \times \text{Atk}_\text{post-cap} + \sqrt{\text{Atk}_\text{post-cap}} + 10 }[/math]


Night Battle
  • Night Battle data are unclear yet.


With
  • [math]\displaystyle{ \text{Atk}_\text{post-cap} }[/math] the post cap attack power defined here,
  • [math]\displaystyle{ \text{Mod}_\text{EquipmentAtk} }[/math] the bonuses given by equipment, described below.
Accuracy formula against PT boats
The Accuracy formula against PT boats:[5][6][7][8]
[math]\displaystyle{ \text{Hit Rate}_\text{vs.PT} \text{%} = \Big\lfloor ( 0.3 \times \text{Accuracy}_\text{Atk} + \sqrt{\text{Accuracy}_\text{Atk}} + 15 ) \times 1.2 \times \text{Mod}_\text{Ship} \times \Big( \prod^{All Equipment}{\text{Mod}_\text{EquipmentAcc}} \Big) \times \text{Mod}_\text{Night} \Big\rfloor - \text{EVA}_\text{PT} + 1 }[/math]
With
  • [math]\displaystyle{ \text{Acc}_\text{Atk} }[/math] the standard accuracy described here
    • PT boats are "DDs" in the game, so the [math]\displaystyle{ \text{Mod}_\text{formation} }[/math] for vanguard is 1.1 during shelling, and 1.2 during the torpedo phase.
    • Historical accuracy bonuses during Events are included in the Standard Accuracy Term, i.e. it is affected by the [math]\displaystyle{ \text{Mod}_\text{PT} }[/math] modifier.
  • [math]\displaystyle{ \text{EVA}_\text{PT} }[/math] the PT estimated evasion Evasion described bellow,
PT boats stats
Type Luck Luck Eva Evasion [math]\displaystyle{ \text{EVA}_\text{PT} }[/math]
Line AheadLineAhead.png EchelonEchelon.png Line AbreastLineAbreast.png
PT Imp PackPT Imp Pack ? ? 81? 87? ?
PT Imp Pack IIPT Imp Pack II 60 220 80 87 85
PT Imp Pack IIIPT Imp Pack III 60 250 82 89 88
PT Imp Pack IVPT Imp Pack IV ? ? ? 84? ?
Schnellboot Imp PackSchnellboot Imp Pack ? ? ? ? ?
Schnellboot Imp Pack IISchnellboot Imp Pack II ? ? ? ? ?
Schnellboot Imp Pack EliteSchnellboot Imp Pack Elite ? ? ? ? ?


The main Accuracy modifiers are
  • [math]\displaystyle{ \text{Mod}_\text{Amagiri} }[/math] being include in [math]\displaystyle{ \text{Acc}_\text{Atk} }[/math]:
  • [math]\displaystyle{ \text{Mod}_\text{Ship} }[/math] the bonus given by ship types, described below,
  • [math]\displaystyle{ \text{Mod}_\text{EquipmentAcc} }[/math] the bonuses given by equipment, described below,
  • [math]\displaystyle{ \text{Mod}_\text{Night} }[/math] being 0.7 during night battle, 1 during day battle.


Amagiri Kai Ni/DAmagiri Kai Ni
Amagiri Kai Ni D
has the ability to prioritize focusing on attacking PT imps with significantly increased accuracy if any are present.

  • DD placed in the composition slots above and below her will gain a noticeable accuracy boost and will prioritize attacking PT boats if any are present.
  • The PT boat targeting rate is 100% for all affected ships [9].

During Events, some special bonuses may be added, with "historical" ships and equipment gaining some accuracy bonuses[10].

Ship Type [math]\displaystyle{ \text{Mod}_\text{Ship} }[/math]
DD & DE 1.0
CL, CLT, & CT 0.82
All other types 0.7
Equipment [math]\displaystyle{ \text{Mod}_\text{EquipmentAcc} }[/math] [math]\displaystyle{ \text{Mod}_\text{EquipmentAtk} }[/math]
1st equipped 2nd equipped 1st equipped 2nd equipped
Small Caliber Main GunSmall Caliber Main High-Angle GunSmall Small Caliber Main Guns[11] 1.3 1.15 1.5 2.11.5×1.4
Secondary GunSecondary High-Angle GunSec Secondary Guns[12] 1.55 1 1.3
Anti-Aircraft Gun Anti-Aircraft Guns 1.45 1.35 1.2 1.441.2×1.2
Lookout Skilled LookoutsSkilled Lookouts
Torpedo Squadron Skilled Lookouts
1.75 1 1.1
Landing CraftArmed Soukoutei (Armored Boat Class)Soukoutei (Armored Boat Class) 1.45 1.3 1.2 1.1
Armed DaihatsuArmed Daihatsu 1.45 1.3 1.2 1.1
Amphibious Vehicle Ka-Tsu TanksSpecial Type 4 Amphibious Tank
Special Type 4 Amphibious Tank Kai
[13][14]
1 1.3 1 1.1
Seaplane BomberBomberSeaplane Fighter Seaplane Bombers & Seaplane Fighters 1.5 1 1.2
Dive BomberJetFighterBomber1.pngJetFighterBomber2.png Dive Bombers & JetsKikka Kai
Jet Keiun Kai
1.375 1.2 1.4 1.821.4×1.3
All other equipment 1 1
Notes
  • It is recommended to use anti-PT setups on DDs only, such setups compromising overall combat effectiveness.
  • Having a Reinforcement Expansion is important because it can save a ship slot by containing a machine gun or skilled lookouts.
  • Combining equipment is recommended to see significant boosts to accuracy.
  • The Amphibious Vehicle Ka-Tsu TanksSpecial Type 4 Amphibious Tank
    Special Type 4 Amphibious Tank Kai
    bonus does not stack with the Landing Craft Armed BoatsSoukoutei (Armored Boat Class)
    Armed Daihatsu
    ones.
  • Using other setups improving accuracy is also advisable:
References:
[edit]

Historical Bonus

On almost every Event map, as well as some regular maps (7-4 & 7-5 so far), certain ships, types of ships, equipment, or types of equipment will bring bonuses.

  • Those bonuses are most of the time raw damage multipliers, and sometimes, accuracy bonuses.
  • Bonuses are independent to each ship, so only the ships with any historical bonus or ships equipped with historical equipment will be affected.
  • Bonuses may be applicable to some part of a map only, such as specific phases of nodes.

This mechanic is here to encourage the use of "historically significant fleets and setups".

  • By nature, historical bonuses are arbitrary, so refer to each individual map to see what bonuses are applicable.

Debuffs

Debuffs are a special case that only applies during events. Certain event maps have debuff mechanics that require meeting certain conditions to trigger them. Debuffs can be either a reduction to the enemy's armor or a post-cap damage modifier for the fleet.

Notes:

  • Debuffs are affected by the remaining ammo modifier.

Overkill Protection

When a ship in the fleet takes more damage than her current HP, she will take a percentage of her current HP in damage instead.

  • The ship must be the flagship OR
  • The ship must not be heavily damaged (大破) nor red moraleBattle Card Status Heavy Fatigue Face.png at the start of the battle.
    • If the ship has red morale, she will just have her HP reduced to 1.
Overkill formula
[math]\displaystyle{ \text{Damage}_\text{Overkill} = \text{HP}_\text{current} \times 0.5 + \text{HP}_\text{rand} \times 0.3 }[/math]

With:

  • [math]\displaystyle{ \text{HP}_\text{current} }[/math] is the current HP Health of the ship.
  • [math]\displaystyle{ \text{HP}_\text{rand} }[/math] is a random HP number between 0 and [math]\displaystyle{ \text{HP}_\text{current} - 1 }[/math]

Therefore, the maximum damage from overkill protection is [math]\displaystyle{ \text{HP}_\text{current} \times 0.8 - 0.3 }[/math] and the minimum damage is [math]\displaystyle{ \text{HP}_\text{current} \times 0.5 }[/math].

Overkill protection will take off between 50-80% of the ship's current HP.

Important Information

  • In general:
    • Overkill protection is most applicable to DDs.
      • The most pronounced effects of overkill protection occur at low HP
      • It is also the primary means of surviving a hit they fail to evade
      • For example, a 32HP DD has a 15.5% chance of being heavily damaged (大破) by a BB hime, while a 31 HP DD has just a 6.5% chance
      • This has great implications when marrying ships, 36 HP has one of the highest chances of a taiha
    • Odd numbered HP is better when overkill protection is triggered. This is because the damage calculations round down, reducing the likelihood of being knocked down to heavy damage.
    • This mechanism is most applicable to ships at full HP. Once a ship starts taking damage, the utility of overkill protection diminishes
  • Generally ships with HP that is divisible by 4 have worse survivability.

Other Information