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Gun Fit Bonuses

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The fit bonuses detailed on this page are the hidden fit bonuses. For the visible fit bonuses, please check individual ship girl or equipment pages.

What is fit?

Fit is a hidden bonus or penalty that certain ship types/classes receive when equipped with guns of the correct caliber. All information on this page is sourced from the spreadsheet maintained by y7h65, Dewy, and SWDN.

Large Caliber Guns

Fit Bonus Table

Equipment Gangut Kongou-class Bismarck
Vittorio Veneto-class
Iowa Richelieu Warspite Nelson Colorado Aviation Battleships Ise-class Kai Ni Fusou-class Base
Nagato-class Nagato Kai Ni Mutsu Kai Ni Yamato-class Notes
35.6cm
38cm Twin
+7 +7 +4 +4? +4 +6 0 ?? +4 +4? +2 +2 +2? +2? 0
38.1cm +7 +7 +4 +4? +4 +8 0 ?? +4 +4? +2 +2 +2? +2? 0
30.5cm +10 +7 +4 +4? +4 +6 0 ?? +4 +4? +2 +2 +2? +2? 0
38cm Quad 0 0 0? 0? +4~5 ?? ?? ?? 0 0? 0? 0? 0? 0? 0
381mm +1 -2 +1 -2? -2 +1~2 0 ?? +2 ?? +2 +2 +2? +2? 0
41cm -7 -5 -5 -5 -5 +2 +3? ?? +2 +4? +2 +2 +5 +5 0 Does not include 41cm Triple and Twin Kai Ni
41cm Twin Gun Mount Kai 2 ?? ?? ?? ?? ?? ?? ?? ?? ?? +6 ?? ?? +5~6 +5~6 ??
41cm Triple Gun Mount Kai 2 ?? -5 ?? ?? ?? ?? ?? ?? ?? +4? ?? ?? +5 +5 0
16in Triple Gun Mount Mk.7 -3 -5 -5 0 -5 ?? ?? ?? 0 ?? +2 +2 0 0 0
16in Triple Gun Mount Mk.7 + GFCS ?? -6~7? -4? -2

+5 (Married)

?? -2? 0 ?? ?? ?? +2? +2? ?? ?? ??
16inch Mk.I Triple Gun Mount -9~10 -5 -4~5 ?? -7 +5 0 ?? 0 ?? +3 +3 ?? ?? ??
16inch Mk.I Triple Gun Mount + AFCT Kai ?? -6 ?? ?? -14 ?? ?? ?? ?? ?? ?? ?? +4 +4 ??
16inch Mk.I Triple Gun Mount Kai + FCR Type 284 ?? -3 ?? ?? -8 +3~4 ?? ?? ?? ?? ?? ?? ?? ?? ??
Prototype 46cm Twin Gun Mount -7 -7 -7 -7 -7 -8 ?? ?? -3 ?? -3 -3 -2? -2? +3
46cm Triple Gun Mount -18 -10 -10 -10 -10 -11 -2~+1? ?? -7

-11 (Fast+)

-7?

-11? (Fast+)

-7 -7 -4 -4 +3
46cm Triple Gun Mount Kai ?? -10 ?? ?? ?? ?? ?? ?? -4? ?? ?? ?? -6? -6? +7
51cm - - - - - - - - - - - 0 -5 -8 0
  • The values in this table are accuracy bonuses/penalties.
  • Question marks indicate values still being tested.
  • Marriage reduces the fit penalties by 40%.
    • It does not affect fit bonuses unless where indicated.

Calculating Large Caliber Fit

The formula for fit bonuses is:
[math]\text{Fit Bonus}_\text{Ship} = \sum \text{Fit Bonus}_\text{Gun} \times \sqrt{\text{Number of Guns Equipped}}[/math]

An example: Kongou having 2 35.6cm and 1 46cm.
Fit Bonus: (7 x √2) + (-10 x √1) = -0.1

Medium Caliber Guns

Equipment Light Cruisers Agano-class Ooyodo Heavy Cruisers Mogami-class Suzuya Kai Ni

Kumano Kai Ni

Zara-class Seaplane Tenders Notes
15.2cm Naval Gun +4NAccuracy
+1Firepower
+4N
+1Firepower
+4N
+1Firepower
0 0 0 0 ??
14cm Naval Gun +4N
+1Firepower
+4N
+1Firepower
+4N
+1Firepower
0 0 0 0 ??
14cm Twin Gun Mount +2Accuracy
+2Firepower
+2N+5Accuracy
+2Firepower
+2Accuracy
+2Firepower
0 0 0 0 -5NAccuracy
14cm Twin Gun Mount Kai +2Accuracy
+2Firepower
+2N+5Accuracy
+2Firepower
+2Accuracy
+2Firepower
0 0 0 0 -7NAccuracy
15.2cm Twin Gun Mount
(Kai)
+2Accuracy
+2Firepower
+2N+5Accuracy
+2Firepower
+2Accuracy
+2Firepower
0 0 0 0 -6NAccuracy
Bofors 15.2cm Twin Gun Mount Model 1930 +3Accuracy
??Firepower
?? ?? 0 0 0 0 0
15.5cm Triple Gun Mount (Main)
15.5cm Triple Gun Mount Kai (Main)
-2-2NAccuracy -2-2NAccuracy +2Accuracy ?? +2Accuracy +5Accuracy ?? ??
20.3cm (IJN Only) 0 0 0 +10Accuracy +10Accuracy +10Accuracy +10Accuracy -8-10NAccuracy
203mm / 53 Twin Gun Mount -2-2.5N -2-2.5N -2-2.5N 0 0 0 +1Accuracy
+1Firepower
??
  • The values in this table are accuracy bonuses/penalties.
  • Question marks indicate values still being tested.
  • The N indicates the variable fit from having more than one gun equipped.
  • The 20.3cm IJN fit only applies to night battle.
    • The bonus is applies to both accuracy and evasion.
    • The fit bonus used to be capped at +15% but recent testing has shown that the cap may have been removed.

Medium Caliber Guns Firepower Bonus

Gun Fit Bonus Notes
14cm Twin Gun Mount
15.2cm Twin Gun Mount
15.2cm Twin Gun Mount Kai
+2
14cm Naval Gun
15.2cm Naval Gun
+1 The 15.2cm is a secondary gun

Calculating Firepower Bonus

The formula for the firepower bonus is:
[math]\text{Fit bonus} = (2 \times \sqrt{\text{No of Twin Guns}}) + \sqrt{\text{No of Single Guns}}[/math]

Example calculation: A light cruiser with 1 15.2cm Twin and 2 15.2cm Singles
Firepower bonus: (2 × √1) + √2 = 3.4

Italian Heavy Cruiser Fit Bonus

Zara and Pola a further firepower fit bonus when equipped with the 203mm / 53 Twin Gun Mount. In addition to the flat +1 accuracy bonus, the firepower bonus is calculated using the following formula:

[math]\text{Italian Gun Fit Bonus} = \sqrt{\text{No of Guns}}[/math]

This firepower bonus is pre-cap.

High-Angle Guns

Equipment Light Cruisers Yura Kai Ni Mutsuki-class Satsuki Kai Ni Kamikaze-class Notes
12.7cm Single High-angle Gun Mount (Late Model) +4NAccuracy +4+10NAccuracy ?? +5Accuracy ??
12.7cm Twin High-Angle Mount (Late Model) +2+2N ?? ?? ?? ??
  • The values in this table are accuracy bonuses/penalties.
  • Question marks indicate values still being tested.
  • The N indicates the variable fit from having more than one gun equipped.
  • Only the Late Model variants were tested.