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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.
  • 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.

Such fit mechanics do not apply to abyssals.[1]

Large Caliber Main Guns

Battleships receive accuracy bonuses if the guns are fit and accuracy penalties if its overweight[1]. How much bonus/penalty a ship receives, depends on the battleship class, the caliber and type of the gun, and whether the battle takes place during day or night.

Ship Class (PPrototype 35.6cm Triple Gun Mount)35.6cm35.6cm Twin Gun Mount(DC35.6cm Twin Gun Mount (Dazzle Camouflage)),
38cm38cm Twin Gun Mount(K38cm Twin Gun Mount Kai),
30.5cm30.5cm Triple Gun Mount(K30.5cm Triple Gun Mount Kai),
38.1cm38.1cm Mk.I Twin Gun Mount (/N38.1cm Mk.I/N Twin Gun Mount Kai)
38cmQ38cm Quadruple Gun Mount,
38cmQK38cm Quadruple Gun Mount Kai
381mm381mm/50 Triple Gun Mount,
381mmK381mm/50 Triple Gun Mount Kai
41cm 16inch (United States Navy) 16inch (Royal Navy) 46cm P51cmPrototype 51cm Twin Gun Mount,
51cm51cm Twin Gun Mount
51cm TriplePrototype 51cm Triple Gun Mount
41cm41cm Twin Gun Mount,
ProtoPrototype 41cm Triple Gun Mount,
Kai41cm Triple Gun Mount Kai
3K241cm Triple Gun Mount Kai Ni 2K241cm Twin Gun Mount Kai Ni Mk.716inch Triple Gun Mount Mk.7 Mk.7
+GFCS
16inch Triple Gun Mount Mk.7 + GFCS
Mk.6
mod.2
16inch Triple Gun Mount Mk.6 mod.2
Mk.I16inch Mk.I Triple Gun Mount +AFCT16inch Mk.I Triple Gun Mount + AFCT Kai Kai
+FCR
16inch Mk.I Triple Gun Mount Kai + FCR Type 284
ProtoPrototype 46cm Twin Gun Mount 46cm46cm Triple Gun Mount Kai46cm Triple Gun Mount Kai
GangutGangut +7
30.5cm: +10
0 +1 -7 -3 -9~10? ?? ?? -7 -18 ?? N/A
Kongou-classKongou
Hiei
Kirishima
Haruna
+7 0 -2 -5 -5? -5 -6~7? -5 -6 -3 -7 -10 -10?
BismarckBismarck
Vittorio Veneto-classLittorio
Roma
+4 0? +1 -5 -5 -4? -5 ?? ?? -7 -10 ??
IowaIowa +4? 0? -2? -5 0 +2 -7 -10 ??
South DakotaSouth Dakota -5
M: +4.6
RichelieuRichelieu +4 +4~5 -2 -5 -5 -7 -14? -8 -7 -10 ??
WarspiteWarspite +6
38.1cm: +8
+1~2 +2 -2? +5 ?? +3~4 -8 -11 ??
NelsonNelson 0 0 +3? 0 0
Ise-class Kai/Fusou-class Kai/NiIse Kai
Hyuuga Kai
Fusou Kai
Fusou Kai Ni
Yamashiro Kai
Yamashiro Kai Ni
+4 0 +2 +2 0 0? -3 -7
F+: -11?
-4?
Ise-class Kai NiIse Kai Ni
Hyuuga Kai Ni
+4? 0? +4? +4? +6 +2 ?? -7
F+: -11?
??
Ise/Fusou-classes BaseIse
Hyuuga
Fusou
Yamashiro
+2 0? +2 +2 +2 +2? +3 -3 -7 ??
Nagato-classNagato
Mutsu
0 ??
Nagato-class Kai NiNagato Kai Ni
Mutsu Kai Ni
+2? 0? +2? +5 +5 +5~6 0 +4 -2? -4? -6? Nagato: -5
Mutsu: -8
??
Yamato-classYamato
Musashi
0 +3 +3 +7 0 ??
Yamato Kai NiYamato Kai Ni[2] (FBB) 0 ?? -7 ?? ?? -10
Note: Fit gun mechanics are still being investigated to this day, hence the values are not final and may be subject to changes. Values with a question mark either mean that it is not conclusive yet or the conclusion drawn here is not the same as the one drawn by Yumeji.
  • The table shows an estimated accuracy fit bonus based on having one fit gun equipped.
  • For married ships, the overweight penalty is reduced by 40% (A married Kongou with a 46cm receives a penalty of -6 instead of -10, for example).
  • If more than one gun of the same class is used, multiply the modifier by the square root of number of guns. (A Kongou-class with two A class guns equipped for example, that's √2 x 7 = 9.89)
  • If guns from different classes are used together, add the modifiers together. (A Kongou with a 35.6cm and 41cm mixed for example, that's 7 - 5 = 2.
  • Exceptions arise where different guns of the same class give different bonuses on certain ships, notably Gangut. What would happen if you combine 30.5cm and 35.6cm is still under investigation.
  • The information in this table is sourced from this spreadsheet maintained by Dewy with the relevant sources linked in the spreadsheet.
Last Updated: Aug 24th 2020 Made by: Tsubakura

More generally, the accuracy offset can be defined with the formula:

[math]\displaystyle{ W = \sum^{\text{All Classes}} \left ( C_{k} M_{k} \sqrt{N_{k}} \right ) \% }[/math]

Where:

  • [math]\displaystyle{ W }[/math] is the resulting fit bonus or overweight penalty
  • [math]\displaystyle{ C_{k} }[/math] is the main coefficient of the equipped gun class. Refer to the above table for the coefficients applied to each Battleship for their respective guns.
  • [math]\displaystyle{ M_{k} }[/math] is the marriage coefficient for the particular gun class. Assumes a value of 0.6 if the ship is married, and if the main coefficient is negative.
  • [math]\displaystyle{ N_{k} }[/math] is the number of equipped guns for that gun class.

Native Guns

Since gun overweight penalty and fit bonuses are not yet all measured for some guns and ships, here is a list of the guns natively used/planed to be used in real life by each ship class.

  • The "Twin/Triple" mount distinction is made for convenience, triple guns being heavier than their twin counterpart.
  • Equipping ships with those guns may not always be optimal, but this should avoid most overweight penalties.
Large Main GunLarge Guns
Nation Class Caliber Twin Triple
Japanese Kongou-class
Fusou-class
Ise-class
35.6 cm
Equipment Card 35.6cm Twin Gun Mount.png
35.6cm Twin Gun Mount
Equipment Card 35.6cm Twin Gun Mount (Dazzle Camouflage).png
35.6cm Twin Gun Mount (Dazzle Camouflage)
Equipment Card 35.6cm Twin Gun Mount Kai.png
35.6cm Twin Gun Mount Kai
Equipment Card 35.6cm Twin Gun Mount Kai Ni.png
35.6cm Twin Gun Mount Kai Ni
Equipment Card Prototype 35.6cm Triple Gun Mount.png
Prototype 35.6cm Triple Gun Mount
Equipment Card 35.6cm Triple Gun Mount Kai (Dazzle Camouflage).png
35.6cm Triple Gun Mount Kai (Dazzle Camouflage)
Fusou-class Kai Ni
Ise-class Kai Ni
Nagato-class
41 cm
Equipment Card 41cm Twin Gun Mount.png
41cm Twin Gun Mount
Equipment Card 41cm Twin Gun Mount Kai Ni.png
41cm Twin Gun Mount Kai Ni
Equipment Card Prototype 41cm Triple Gun Mount.png
Prototype 41cm Triple Gun Mount
Equipment Card 41cm Triple Gun Mount Kai.png
41cm Triple Gun Mount Kai
Equipment Card 41cm Triple Gun Mount Kai Ni.png
41cm Triple Gun Mount Kai Ni
Yamato-class 46 cm
Equipment Card Prototype 46cm Twin Gun Mount.png
Prototype 46cm Twin Gun Mount
Equipment Card 46cm Triple Gun Mount.png
46cm Triple Gun Mount
Equipment Card 46cm Triple Gun Mount Kai.png
46cm Triple Gun Mount Kai
Yamato-class Kai Ni 51 cm
Equipment Card Prototype 51cm Twin Gun Mount.png
Prototype 51cm Twin Gun Mount
Equipment Card 51cm Twin Gun Mount.png
51cm Twin Gun Mount
Equipment Card Prototype 51cm Triple Gun Mount.png
Prototype 51cm Triple Gun Mount
US Colorado-class 40,64 cm
Equipment Card 16inch Mk.I Twin Gun Mount.png
16inch Mk.I Twin Gun Mount
Equipment Card 16inch Mk.V Twin Gun Mount.png
16inch Mk.V Twin Gun Mount
Equipment Card 16inch Mk.VIII Twin Gun Mount Kai.png
16inch Mk.VIII Twin Gun Mount Kai
North Carolina-class
South Dakota-class
Equipment Card 16inch Triple Gun Mount Mk.6.png
16inch Triple Gun Mount Mk.6
Equipment Card 16inch Triple Gun Mount Mk.6 + GFCS.png
16inch Triple Gun Mount Mk.6 + GFCS
Equipment Card 16inch Triple Gun Mount Mk.6 mod.2.png
16inch Triple Gun Mount Mk.6 mod.2
Iowa-class
Equipment Card 16inch Triple Gun Mount Mk.7.png
16inch Triple Gun Mount Mk.7
Equipment Card 16inch Triple Gun Mount Mk.7 + GFCS.png
16inch Triple Gun Mount Mk.7 + GFCS
British Queen Elizabeth-class 38.1 cm
Equipment Card 38.1cm Mk.I Twin Gun Mount.png
38.1cm Mk.I Twin Gun Mount
Equipment Card 38.1cm Mk.I N Twin Gun Mount Kai.png
38.1cm Mk.I/N Twin Gun Mount Kai
Nelson-class 40,64 cm
Equipment Card 16inch Mk.I Triple Gun Mount.png
16inch Mk.I Triple Gun Mount
Equipment Card 16inch Mk.I Triple Gun Mount + AFCT Kai.png
16inch Mk.I Triple Gun Mount + AFCT Kai
Equipment Card 16inch Mk.I Triple Gun Mount Kai + FCR Type 284.png
16inch Mk.I Triple Gun Mount Kai + FCR Type 284
Italian Conte di Cavour-class 30.5 cm
Equipment Card 305mm 46 Twin Gun Mount.png
305mm/46 Twin Gun Mount
Equipment Card 305mm 46 Triple Gun Mount.png
305mm/46 Triple Gun Mount
32 cm
Equipment Card 320mm 44 Twin Gun Mount.png
320mm/44 Twin Gun Mount
Equipment Card 320mm 44 Triple Gun Mount.png
320mm/44 Triple Gun Mount
Vittorio Veneto-class 38.1 cm
Equipment Card 381mm 50 Triple Gun Mount.png
381mm/50 Triple Gun Mount
Equipment Card 381mm 50 Triple Gun Mount Kai.png
381mm/50 Triple Gun Mount Kai
German Bismarck-class 38 cm
Equipment Card 38cm Twin Gun Mount.png
38cm Twin Gun Mount
Equipment Card 38cm Twin Gun Mount Kai.png
38cm Twin Gun Mount Kai
French Richelieu-class 38 cm
Equipment Card 38cm Quadruple Gun Mount.png
38cm Quadruple Gun Mount
Equipment Card 38cm Quadruple Gun Mount Kai.png
38cm Quadruple Gun Mount Kai
Equipment Card 38cm Quadruple Gun Mount Kai Deux.png
38cm Quadruple Gun Mount Kai Deux

'"Double Twin Guns" in a Quadruple Mount.
Russian Gangut-class 30.5 cm
Equipment Card 30.5cm Triple Gun Mount.png
30.5cm Triple Gun Mount
Equipment Card 30.5cm Triple Gun Mount Kai.png
30.5cm Triple Gun Mount Kai

Medium Caliber Main Guns

Cruisers can receive accuracy and/or firepower bonuses from using fit guns in their load-out.

Ship Class 14cm Single14cm Single Gun Mount
15.2cm Single15.2cm Single Gun Mount (YellowGun.png)
14cm Twin14cm Twin Gun Mount
 14cm Twin Kai14cm Twin Gun Mount Kai
15.2cm15.2cm Twin Gun Mount
15.2cmK15.2cm Twin Gun Mount Kai
Bofors 15.2cmBofors 15.2cm Twin Gun Mount Model 1930 15.5cm15.5cm Triple Gun Mount
 15.5cmK15.5cm Triple Gun Mount Kai
20.3cm20.3cm Twin Gun Mount
 20.3cm(2)20.3cm (No.2) Twin Gun Mount
20.3cm(3)20.3cm (No.3) Twin Gun Mount
203mm/53203mm/53 Twin Gun Mount 8inch Mk.98inch Triple Gun Mount Mk.9
 8inch Mk.9 m.28inch Triple Gun Mount Mk.9 mod.2
Day Night
CL(T) +4NAccuracy +1Firepower ?? +2?Accuracy +2Firepower +3Accuracy ??Firepower -2 -2NAccuracy -3N?Accuracy[1] -2 -2.5N?Accuracy -10N?Accuracy
Agano-classAgano
Noshiro
Yahagi
Sakawa
?? +5 +2N?Accuracy +2Firepower -2 -2NAccuracy
OoyodoOoyodo ?? +2?Accuracy +2Firepower +2Accuracy
CA(V) 0 +5 +5N?Accuracy 0
Mogami-classMogami
Mikuma
Suzuya
Kumano
+2Accuracy
Mogami-class Kai NiMogami Kai Ni
Suzuya Kai Ni
Kumano Kai Ni
+5Accuracy
Zara-classZara
Pola
+1Accuracy +1Firepower
Seaplane Tenders (AV) -6NAccuracy -6NAccuracy -8 -10NAccuracy -8 -10N?Accuracy

Note: Fit gun mechanics are still being investigated to this day, hence the values are not final and may be subject to changes. Values with a question mark mean that it is potentially outdated and might no longer be correct.

  • The table shows an estimated accuracy and/or firepower fit bonus based on having one fit gun equipped.
    • The variable N refers to the number of guns of that category equipped. (Ex: 2 guns of 2N = 4 ACC)
  • Bonuses from guns of different classes are simply added together.
  • The night fit bonus from the 20.3cm series used to be capped at +15%. However, it is unknown whether this cap has been removed or not from the recent updates.
  • There is a possibility that certain fit categories only work during the day. The possibility is plausible, but there's no concrete data proving. The alternative theory is that the night bonus from the 20.3cm series overrides any other categories.
  • The information in this table is sourced from these two spreadsheets (1) (2) the latter maintained by Dewy, both with the relevant sources linked in the spreadsheet.
  • As of 13th December 2018 the hidden firepower bonus of 14cm Twin Gun Mount Kai14cm Twin Gun Mount Kai does not work/does not exist[citation needed].
Last Updated: June 23rd 2019 Made by: Tsubakura

Small Caliber Main Guns

As of 2017/06/23, Yura and Mutsuki/Kamikaze-classes of destroyers gain bonuses with some main HA guns High-Angle Gun.

Ship 12.7 cm Single HA Mount (LM)12.7cm Single High-angle Gun Mount (Late Model) 12.7 cm Twin HA Mount (LM)12.7cm Twin High-angle Gun Mount (Late Model)
Light Cruisers (CL) +4NAccuracy +2 +2NAccuracy
Yura Kai NiYura Kai Ni +4 +10NAccuracy
Mutsuki-classMutsukiKisaragi
YayoiUzuki
SatsukiMinazuki
FumizukiNagatsuki
KikuzukiMikazuki
Mochizuki
+5Accuracy
Kamikaze-classKamikaze
Asakaze
Harukaze
Matsukaze
Hatakaze
??

Unknown factors:

  • Only Yura K2Yura Kai Ni and Satsuki K2Satsuki Kai Ni were tested[citation needed]. It's unknown whether the other ships in the same class would receive the same bonus 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 ACC).
  • It is unknown whether the 12.7 cm Single HA Mount12cm Single High-angle Gun Mount gives a fit bonus or not.
  • The information in this table is sourced from this spreadsheet maintained by Dewy, but has no sources linked in the spreadsheet.
Last Updated: December 5th 2018 Made by: Tsubakura

DD Fit Accuracy

Certain DDs have a higher-than-expected hit rate when equipped with certain guns or sonars.

  • The bonus accuracy likely takes the form: [math]\displaystyle{ \text{ACCURACY}_\text{bonus} = \text{C} \times \sqrt{\text{N}} }[/math]
    • N being the amount of equipment.
Known "C" values
Ship/Class Gear C
Tashkent/VerniyTashkent
Verniy
Small Main Gun130mm B-13 Twin Gun Mount130mm B-13 Twin Gun Mount 5
Fletcher-classFletcher
Johnston
High-Angle Gun5" Single Gun Mount 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-classSamuel B. Roberts High-Angle Gun5" Single Gun Mount 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[2]
J-classJervis
Janus
Small 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-classMutsukiKisaragi
YayoiUzuki
SatsukiMinazuki
FumizukiNagatsuki
KikuzukiMikazuki
Mochizuki
Small Main Gun12cm Single Gun Mount Kai 212cm Single Gun Mount Kai 2 5
Source: [1][2]
  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.

See Also

Fit gun bonus - Reddit intermediate players' guide