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Combat/Overweight Penalty and Fit Gun Bonus

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The "hidden fit bonus" mechanic refers to some ships receiving bonuses or penalties when equipping certain equipment, depending on if the equipment "fits" the class or not.

  • This almost exclusively refers to main guns, where each class of ship is engineered to carry up to certain gun calibers, and so, equipping gun turrets of the right caliber or lower will imply an accuracy bonus, whereas using larger calibers will result in some overweight penalties.
  • So far, all fits involve Accuracy Accuracy, and some also affect Firepower Firepower (excluding #Arctic Map Bonuses unic case).
    • Accuracy Accuracy bonuses work like regular visible Accuracy stat, see here for more information.
    • Firepower Firepower bonuses are "pre-cap",
  • Not to be confused with visible Equipment Bonuses.

As hidden bonuses are unaffected by morale or fleet types (e.g. combined fleets), it can be interesting to utilize those fit bonuses as much as possible.

How much bonus/penalty a ship receives, depends on:

  • The ship class, larger classes being able to carry larger equipment,
  • If the ship is married or not, married girls having better fits,
  • The gun size (caliber and quantity per turret), the larger ones being the most constraining.
  • Some other less frequent factors:
    • The ship's remodel,
    • The ship's speed,
    • Whether it is a day or night battle.

Battleships (FBB/BB/BBV) Bonuses

Battleships receive accuracy Accuracy bonuses if the guns are fit and penalties if it is overweight [3].

Table Explainer

When equiping Large Caliber Main Gun "Large Caliber Main Guns" on a FBB/BB/BBV, the resulting accuracy bonus/penalty is:

Fit Formula
[math]\displaystyle{ \text{ACC}_\text{bonus} = \sum^{\text{All Groups} } C_{Group} \times \sqrt{N_{Group} } \times M }[/math]
With
  • [math]\displaystyle{ \text{All Groups} }[/math] the gun groups and sub-groups defined in the following tables.
  • [math]\displaystyle{ C_{Group} }[/math] the accuracy modifier of the group, given in the following table.
    • When a ship has additional bonuses to a group compared to her type, this bonus is summed as a separate "Group".
  • [math]\displaystyle{ N_{Group} }[/math] the number of guns of a same group.
  • [math]\displaystyle{ M }[/math] the Marriage bonus of 0.6 when applicable, 1 else.
    • This bonus is applied only for Groups marked by footnote [1],
    • When applied, this bonus is applied in all situations, with penalties being reduced by 0.6, as well as bonuses being reduced by 0.6.
    • For Iowa-class with the USN 16" Mk7 guns, M may be better, the observed bonu being [math]\displaystyle{ \text{ACC}_\text{bonus} = 6 \times \sqrt{N_{16inch Mk.7}} + 12 \times \sqrt{N_{16inch Mk.7 GFCS}} }[/math].
Notes
  • For BB only: if the base maximum HP Health (unmodified & before marriage) is superior to 92, set fit bonuses are set to 0.
  • Do note that speed modding ships (to Fast+) has been observed to worsen the penalties on certain ships.
Examples

Kongou Kai Ni equipped with 2 IJN 35.6cm Twin K235.6cm Twin Gun Mount Kai Ni:

  • [math]\displaystyle{ \text{ACC}_\text{bonus} = C_{35.6 cm FBB} \times \sqrt{N_{35.6 cm}} + C_{35.6 cm Kongou-class} \times \sqrt{N_{35.6 cm}} = ( 4 + 3 ) \times \sqrt{2} = +9.90 }[/math]
  • This bonus stays the same when married, as no M multiplier is applied in this case.


Nagato Kai Ni equiped with 1 IJN 41cm Twin41cm Twin Gun Mount and 1 IJN 51cm Twin ProtoPrototype 51cm Twin Gun Mount:

  • [math]\displaystyle{ \text{ACC}_\text{bonus} = C_{41 cm BB} \times \sqrt{N_{41 cm}} + C_{IJN 41cm Twin Nagato Kai Ni} \times \sqrt{N_{IJN 41cm Twin}} + C_{51cm} \times \sqrt{N_{51cm}} = ( 2 + 4 - 5 ) \times \sqrt{1} = +1.00 }[/math]
  • If Nagato Kai Ni is married, the M multiplier is applied to the -5 only in this case.


Musashi Kai Ni equiped with 1 IJN 51cm Twin51cm Twin Gun Mount and 1 IJN 51cm Triple ProtoPrototype 51cm Triple Gun Mount

  • [math]\displaystyle{ \text{ACC}_\text{bonus} = C_{51 cm Musashi Kai Ni} \times \sqrt{N_{51 cm}} = 0 \times \sqrt{2} = +0.00 }[/math]
  • Musashi Kai Ni has 99 bases Health, and so has bonuses set to ZERO for those guns.


Yamato Kai Ni Juu equiped with 1 IJN 46cm Triple46cm Triple Gun Mount and 1 IJN 51cm Triple ProtoPrototype 51cm Triple Gun Mount

  • [math]\displaystyle{ \text{ACC}_\text{bonus} = C_{46 cm Triple Yamato-class} \times \sqrt{N_{46 cm Triple}} + C_{46/51 cm Yamato Kai Ni Juu} \times \sqrt{N_{46/51 cm}} = 7 \times \sqrt{1} + (-8) \times \sqrt{2} = -4.31 }[/math]
  • If Yamato Kai Ni Juu is married, the M multiplier is applied to the -8 only in this case.

Gun Groups

Large Caliber Main Gun Large Caliber Main Guns Groups
Gun Groups Guns
Sov 30.5 cm [1] Sov 30.5cm Triple30.5cm Triple Gun Mount
Sov 30.5cm Triple K30.5cm Triple Gun Mount Kai
RM 30.5-32 cm [1] RM 305mm/46 Twin305mm/46 Twin Gun Mount
RM 305mm/46 Triple305mm/46 Triple Gun Mount
RM 320mm/44 Twin320mm/44 Twin Gun Mount
RM 320mm/44 Triple320mm/44 Triple Gun Mount
35.6 cm IJN 35.6cm Twin35.6cm Twin Gun Mount
IJN 35.6cm Twin Dazzle35.6cm Twin Gun Mount (Dazzle Camouflage)
IJN 35.6cm Twin K35.6cm Twin Gun Mount Kai
IJN 35.6cm Twin K235.6cm Twin Gun Mount Kai 2
IJN 35.6cm Twin K3 Dazzle35.6cm Twin Gun Mount Kai 3 (Dazzle Camouflage)
IJN 35.6cm Twin K3C35.6cm Twin Gun Mount Kai 3 C
IJN 35.6cm Twin K435.6cm Twin Gun Mount Kai 4
IJN 35.6cm Triple ProtoPrototype 35.6cm Triple Gun Mount
IJN 35.6cm Triple K Dazzle35.6cm Triple Gun Mount Kai (Dazzle Camouflage)
KMS 38cm Twin38cm Twin Gun Mount
KMS 38cm Twin K38cm Twin Gun Mount Kai
RN 38.1cm Twin38.1cm Mk.I Twin Gun Mount [1]
RN 38.1cm Twin K38.1cm Mk.I/N Twin Gun Mount Kai [1]
USN 14" Twin14inch/45 Twin Gun Mount [1]
USN 14" Triple14inch/45 Triple Gun Mount [1]
FR 38 cm FR 38cm Quad38cm Quadruple Gun Mount
FR 38cm Quad K38cm Quadruple Gun Mount Kai
FR 38cm Quad K238cm Quadruple Gun Mount Kai Deux
RM 381 mm RM 381mm/50 Triple381mm/50 Triple Gun Mount
RM 381mm/50 Triple K381mm/50 Triple Gun Mount Kai
41 cm IJN 41cm Twin41cm Twin Gun Mount
IJN 41cm Twin K241cm Twin Gun Mount Kai 2
IJN 41cm Triple ProtoPrototype 41cm Triple Gun Mount
IJN 41cm Triple K41cm Triple Gun Mount Kai
IJN 41cm Triple K241cm Triple Gun Mount Kai 2
RN 16" Triple16inch Mk.I Triple Gun Mount
RN 16" Triple + AFCT16inch Mk.I Triple Gun Mount + AFCT Kai
RN 16" Triple + FCR16inch Mk.I Triple Gun Mount Kai + FCR Type 284
USN 16" MkI Twin16inch Mk.I Twin Gun Mount
USN 16" MkV Twin16inch Mk.V Twin Gun Mount
USN 16" MkVIII Twin16inch Mk.VIII Twin Gun Mount Kai
USN 16" Triple Mk616inch Triple Gun Mount Mk.6
USN 16" Triple Mk6 + GFCS16inch Triple Gun Mount Mk.6 + GFCS
USN 16" Triple Mk6 M216inch Triple Gun Mount Mk.6 mod.2
USN 16" Mk7 USN 16" Triple Mk716inch Triple Gun Mount Mk.7
USN 16" Triple Mk7 + GFCS16inch Triple Gun Mount Mk.7 + GFCS
46 cm [2] Twin IJN 46cm Twin ProtoPrototype 46cm Twin Gun Mount
Triple IJN 46cm Triple46cm Triple Gun Mount
Triple K IJN 46cm Triple K46cm Triple Gun Mount Kai [1]
51 cm IJN 51cm Twin ProtoPrototype 51cm Twin Gun Mount
IJN 51cm Twin51cm Twin Gun Mount
IJN 51cm Triple ProtoPrototype 51cm Triple Gun Mount
15.5 cm Sec [3] IJN 15.5cm Triple Sec15.5cm Triple Secondary Gun Mount
IJN 15.5cm Triple Sec K15.5cm Triple Secondary Gun Mount Kai
IJN 15.5cm Triple Sec K215.5cm Triple Secondary Gun Mount Kai 2
  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 There is not enough data yet to determine exact category of those guns.
  2. The 46 cm are not counted as a single group as several cases show disparities.
  3. Other secondary guns may also have some hidden fits, but are unmapped yet.

Bonus Groups

Type Class Ship Sov 30.5 cm RM 30.5-32 cm 35.6 cm FR 38 cm RM 381 mm 41 cm USN 16" Mk7 46 cm Twin ProtoPrototype 46cm Twin Gun Mount 46 cm Triple46cm Triple Gun Mount 46 cm Triple K46cm Triple Gun Mount Kai 51 cm 15.5 cm Sec
other
35.6 cm
RN 38.1 cm38.1cm Mk.I Twin Gun Mount
38.1cm Mk.I/N Twin Gun Mount Kai
IJN 41 cm Twin41cm Twin Gun Mount other
41 cm
Mk716inch Triple Gun Mount Mk.7 Mk7 + GFCS16inch Triple Gun Mount Mk.7 + GFCS
FBB Base Bonus ? ? 4 0 -2 [1] -5 [1] -5 [1] -7 [1] -10 [1] -10 [1] N/A 0
FBB
Additional
Bonuses
Gangut-class - 12 -4 [1] N/A
Conte di Cavour-class Kai/Nuovo Kai/Nuovo 14
Kongou-class - 3
Bismarck-class - 3 [1]
Vittorio Veneto-class -
Richelieu-class - 2 -2 [1]
North Carolina-class -
South Dakota-class -
Iowa-class - 7 [1] 14 [1]
BB Base Bonus ? ? 2 0 2 [1] 2 0 -3 [1] -7 [1] ? [1] N/A 0
BB
Additional
Bonuses
Conte di Cavour-class base base N/A
Fusou-class base base
Ise-class base base
Nagato-class base/Kai/Ni 2 -5 [1]
Nagato Kai NiNagato Kai Ni 4 3
Nevada-class - N/A
Colorado-class -
Queen Elizabeth-class - 2?
Nelson-class -
Nelson KaiNelson Kai[2] 0
BBV Base Bonus ? ? 4 0 2 [1] 2 0 -3 [1] -7 [1] -7 [1] N/A 0
BBV
Additional
Bonuses
Fusou-class Kai/Ni Kai/Ni N/A
Ise-class Kai/Ni Kai/Ni
Yamato-class Base Bonus[3] 3 3 7 2
BB Yamato-class Base/Kai/Ni[2] 0
FBB Yamato Kai NiYamato Kai Ni -10 [1]
BBV Yamato Kai Ni JuuYamato Kai Ni Juu[4] -5 [1] -8 [1][5]
  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 In those cases ONLY, the Marriage multiplier M (0.6x) is applied when married.
  2. 2.0 2.1 For BB only: if the base maximum HP (unmodified & before marriage) is > 92, set fit bonuses are set to 0.
  3. For all Yamato-class ships, the bonuses are applied in addition to other base types (FBB/BB/BBV) bonuses, including the 92+ HP rule for BB.
  4. Yamato Kai Ni Juu specified bonuses override the base BBV bonuses.
  5. In this case, the "46 cm Triple", "46 cm Triple K", and "51 cm" groups are counted as one.

Sources: [4] [5]

Cruiser Bonuses

Medium Caliber Main Gun High-Angle Gun Medium Caliber Main Guns Groups
Gun Groups Guns
A 14cm Single14cm Single Gun Mount
14cm Twin14cm Twin Gun Mount
14cm Twin Kai14cm Twin Gun Mount Kai
14cm Twin Kai 214cm Twin Gun Mount Kai 2[1]
B 15.2cm Twin15.2cm Twin Gun Mount
15.2cm Twin Kai15.2cm Twin Gun Mount Kai
15.2cm Twin Kai 215.2cm Twin Gun Mount Kai 2
Bofors 15.2cm Twin Mod 1930Bofors 15.2cm Twin Gun Mount Model 1930
Bofors 15cm Twin Mk9 Mod 1938Bofors 15cm Twin Rapid Fire Gun Mount Mk.9 Model 1938
Bofors 15cm Twin Mk9 Kai + Single Mk10 Kai Mod 1938Bofors 15cm Twin Rapid Fire Gun Mount Mk.9 Kai + Single Rapid Fire Gun Mount Mk.10 Kai Model 1938

6" Twin MkXXI6inch Twin Rapid Fire Gun Mount Mk.XXI

C 15.5cm Triple15.5cm Triple Gun Mount
15.5cm Triple Kai15.5cm Triple Gun Mount Kai
D 6" Triple Mk166inch Triple Rapid Fire Gun Mount Mk.16
6" Triple Mk16 mod26inch Triple Rapid Fire Gun Mount Mk.16 mod.2
6" Triple MkXXIII6inch Mk.XXIII Triple Gun Mount

152mm/55 Triple152mm/55 Triple Rapid Fire Gun Mount
152mm/55 Triple Kai152mm/55 Triple Rapid Fire Gun Mount Kai

E 5" Twin CD5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)
GFCS + 5" Twin CDGFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)
F 20.3cm Twin20.3cm Twin Gun Mount
20.3cm N°2 Twin20.3cm (No.2) Twin Gun Mount
20.3cm N°3 Twin20.3cm (No.3) Twin Gun Mount
20.3cm N°4 Twin protoPrototype 20.3cm (No.4) Twin Gun Mount[2]
SKC34 20.3cm TwinSKC34 20.3cm Twin Gun Mount
203mm/53 Twin203mm/53 Twin Gun Mount
G 8" Triple Mk98inch Triple Gun Mount Mk.9
8" Triple Mk9 mod28inch Triple Gun Mount Mk.9 mod.2
  1. This gun bonuses are unclear [1][2]
  2. There is not enough data yet to determine exact category of those guns.
Notes
  • Future Medium Guns may fall in one of those categories based on similarities like caliber and number of guns.
  • Groups A, B, C, D, and E are "Light Cruiser Guns", and Groups F and G are "Heavy Cruiser Gun".

Light Cruisers (CL/CLT/CT)

Accuracy Accuracy bonuses for Light Cruisers (CL), Torpedo Cruisers (CLT), and Training Cruisers (CT).

Ships Guns group[1] Accuracy Accuracy bonus/penalty
1st Gun 2nd Gun Unmarried Married
Default to
every CL(T)/CT
- - 0 0
A/B A/B 0 2
C C -5? -1?
D D -6 -3.6
E E
F F
F - -3 -1.8
G G -22 -17.6
15.2cm Single Secondary15.2cm Single Gun Mount +4N ?
Agano-class B - 5 7
B B 6 8
F F -8 -6
Ooyodo C C -2 -1.2
F F -10 -8
Atlanta-class E E 0 3
Abyssals - - 0[2] -
Any Medium Gun - -3[3] -
  • There is not enough data to pin down the exact fit accuracy formula.
  • Other gun combinations fits cannot be extrapolated yet.
  • There are known tests where the fit bonuses do not scale linearly with the number of guns.


Firepower Firepower bonuses for Light Cruisers (CL), Torpedo Cruisers (CLT), and Training Cruisers (CT).

Ships Guns Firepower Firepower bonus
Default to
every CL(T)/CT
14cm Single14cm Single Gun Mount
15.2cm Single Secondary15.2cm Single Gun Mount
+[math]\displaystyle{ 1\sqrt{N} }[/math]
14cm Twin/Kai/214cm Twin Gun Mount
14cm Twin Gun Mount Kai
14cm Twin Gun Mount Kai 2
 · 15.2cm/Kai/215.2cm Twin Gun Mount
15.2cm Twin Gun Mount Kai
15.2cm Twin Gun Mount Kai 2

BoforsBofors 15.2cm Twin Gun Mount Model 1930
Bofors 15cm Twin Rapid Fire Gun Mount Mk.9 Model 1938
Bofors 15cm Twin Rapid Fire Gun Mount Mk.9 Kai + Single Rapid Fire Gun Mount Mk.10 Kai Model 1938
 · 6" Twin MkXXI6inch Twin Rapid Fire Gun Mount Mk.XXI

+[math]\displaystyle{ 2\sqrt{N} }[/math]


Sources: [8] [9]

Heavy Cruisers (CA/CAV)


Accuracy Accuracy bonuses for Heavy Cruisers (CA), Aviation Cruisers (CAV), as well as some other "Medium Guns capable Auxiliaries".

  • Other ships like Submarine Tenders (AS) are unmapped yet.
Ships IJN 14 cm Twins14cm Twin Gun Mount
14cm Twin Gun Mount Kai
14cm Twin Gun Mount Kai 2
IJN 15.2 cm Twins15.2cm Twin Gun Mount
15.2cm Twin Gun Mount Kai
15.2cm Twin Gun Mount Kai 2
C IJN 20.3 cm20.3cm Twin Gun Mount
20.3cm (No.2) Twin Gun Mount
20.3cm (No.3) Twin Gun Mount
Prototype 20.3cm (No.4) Twin Gun Mount
RM 203 mm203mm/53 Twin Gun Mount G
All N°120.3cm Twin Gun Mount N°2/3/4(?)20.3cm (No.2) Twin Gun Mount
20.3cm (No.3) Twin Gun Mount
Prototype 20.3cm (No.4) Twin Gun Mount
Day Night
CA(V) ? ? ? 0 +10 +15 ? 0
Mogami-class (CA/V) ? ? +2 ?
Mogami-class Kai Ni (CAV) ? ? +5 ?
Zara-class ? ? ? +1
Nisshin
Commandant Teste
Kamoi
Mikuma Kai Ni Toku(?)[1]
-6N -6N ? -8 -10N ? -8 -10N?
Jingei-class ? ? ? ? ? ?
  • The table shows an estimated accuracy fit bonus based on having one fit gun equipped.
    • The variable N refers to the number of guns of that category equipped,
    • E.g. 2 guns of 2N = 4 Acc.
  • Bonuses from guns of different classes are simply added together.
    • The guns not mentioned in this table are simply unmapped, and may have bonuses or penalties.
  • The IJN 20.3 cm only provide bonus on CA(V) during night battles.
    • If a N°1 is used alongside any N°2 or/and N°3, then the bonus used for all those guns will be +10 per gun only.
    • Such fit mechanics do not apply to abyssals.[2]

Firepower Firepower bonuses for Heavy Cruisers (CA), Aviation Cruisers (CAV), as well as some other "Medium Guns capable ships" like Seaplane Tenders (AV), Kamoi (AO forms).

  • Other ships like Submarine Tenders (AS) are unmapped yet.
Ships RM 203 mm203mm/53 Twin Gun Mount
Zara-class +[math]\displaystyle{ 1\sqrt{N} }[/math]

Sources: [11] [12] [13]

12.7cm HA Late Models

As of the 2017-06-23 update, Yura Kai Ni, Mutsuki-classes, and Kamikaze-classes gain accuracy Accuracy bonuses with some main Late Models High Angle 12.7cm guns High-Angle Gun.

Ship 12.7cm Single HA Mount (LM)12.7cm Single High-angle Gun Mount (Late Model) 12.7cm Twin HA Mount (LM)12.7cm Twin High-angle Gun Mount (Late Model) 12.7cm Single HA12cm Single High-angle Gun Mount
CL(T)/CT +4N +2 +2N ?
Yura Kai NiYura Kai Ni +4 +10N ?
Mutsuki-class +5 ? ?
Kamikaze-class ? ? ?
Notes
  • Only Yura Kai NiYura Kai Ni and Satsuki Kai NiSatsuki Kai Ni were tested. It is unknown whether the other ships listed also receive those bonuses, or whether it only works for specific remodels.
  • The variable N refers to the number of guns of that category equipped (ex: 2 guns of 2N = 4).

Sources: [14]

Destroyer (DD) Bonuses

Certain destroyers receive some Accuracy Accuracy bonuses when equipped with certain guns or sonars. The resulting accuracy bonus is:

Fit Formula
[math]\displaystyle{ \text{ACC}_\text{bonus} = \sum^{\text{All Groups} } C_{Group} \times \sqrt{N_{Group} } }[/math]
With
  • [math]\displaystyle{ \text{All Groups} }[/math] the equipment groups defined in the following table.
  • [math]\displaystyle{ C_{Group} }[/math] the accuracy modifier of the group, given in the following table.
    • When a ship has additional bonuses to a group compared to her type, this bonus is summed as a separate "Group"
  • [math]\displaystyle{ N_{Group} }[/math] the number of guns of a same group.
Known "C" values
Ships Gear C
Tashkent/VerniyTashkent
Verniy
Small Caliber Main Gun130mm B-13 Twin Gun Mount130mm B-13 Twin Gun Mount 5
Fletcher-class High-Angle Gun5" Single Gun Mk.30 variants5inch Single Gun Mount Mk.30
5inch Single Gun Mount Mk.30 Kai
5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37
4[1]
John C. Butler-class 4[2]
J-class Small Caliber Main GunQF 4.7inch Gun Mk.XII KaiQF 4.7inch Gun Mk.XII Kai 3
SONARASDICsType124 ASDIC
Type144/147 ASDIC
HF/DF + Type144/147 ASDIC
3 [3]
Mutsuki-class Small Caliber Main Gun12cm Single Gun Mount Kai 212cm Single Gun Mount Kai 2 5
  1. 2x base 5" Gun5inch Single Gun Mount Mk.30 on Fletcher-class gives ~10 accuracy. This is potentially a bug.
  2. Samuel B.Roberts does not seem to receive any bonus from base 5" Gun5inch Single Gun Mount Mk.30. This is possibly a bug (maybe related to the bug on Fletcher-class).
  3. There are not enough samples on more than one ASDICsType124 ASDIC
    Type144/147 ASDIC
    HF/DF + Type144/147 ASDIC
    sonar so it is not clear how does the accuracy bonus scales. This bonus can stack with the accuracy bonus from QF 4.7inch Gun Mk.XII KaiQF 4.7inch Gun Mk.XII Kai.

Sources: [15] [16]

Arctic Map Bonuses

On all "arctic maps", namely all World 3 maps, as well a some Event maps, the Armor Arctic Camouflage (+ Arctic Equipment)Arctic Camouflage (+ Arctic Equipment) gives:

  • 3 Armor Armor (non-stacking),
  • Some post-cap Evasion Evasion.

Sources: [17] [18]

See Also

Main data sources: