Combat/Overweight Penalty and Fit Gun Bonus

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See also: Fit gun bonus - Reddit intermediate players' guide

Fit Bonus and Overweight Penalty

With the introduction of fit gun mechanics on July 28th 2014, ships now will receive fit bonus/penalties depending if the equipped gun fits for the class or if the gun is too heavy for the ship to use.

As fit bonuses are unaffected by morale or combined fleets, it becomes important that you utilize the fit bonuses as much as possible.

Fit mechanics do not apply to the abyssal fleet.

Battleships

Battleships receives accuracy bonuses if the guns are fit and accuracy penalties if its overweight. 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	30.5cm 30.5cmK		35.6cm P35.6cm Dazzle 38cmK 38.1cm 38.1cm/N		38cm四 38cmK四		381mm 381mmK		41cm P41cm 41cmK		16inch GFCS		P46cm		46cm		46cmK		P51cm 51cm
	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night
Kongou Class	+7				0		-2	0	-5		-5		-7		-8		-9		N/A
Bismarck Class	+4				??		+3	0	-5		-2?		-2?		-10		?		N/A
Гангут ClassГангут	+7		+4		0		0	0	-7		-7		-10		-16		?		N/A
Richelieu Class	+4				+5		-2	0	-5		-7		-7		-10		?		N/A
Vittorio Veneto Class	+4				??		+2	0	-7		-5		-10		-10		?		N/A
Iowa Class	+4				??		-2	0	-5		+4		-7		-10		?		N/A
Queen Elizabeth Class	+4				??		+2	0	+2		0		-3		-10		?		N/A
Ise Class (Base)	+2				??		+2	0	+2		+2		-3		-7		?		N/A
Fusou Class (Base)	+2				??		+2	0	+2		+2		-3		-7		?		N/A
Ise Class (Kai)	+4				-2		+2	0	+2		0		-3	-5	-7	-8	-5		N/A
Fusou Class (Kai/Kai Ni)	+4				-2		+2	0	+2		0		-3	-5	-7	-8	-5		N/A
Nagato Class (Base/Kai)	+2				??		+2	0	+2		+2		-3		-7		?		0
Nagato Class (Kai Ni)	??				??		??	0	+5		0		-3		-5		-5		0
Yamato Class	0				0		0		0		0		0		0		0		0
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 means that its 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 arises where different guns of the same class gives different bonuses on certain ships, notably Gangut. What would happen if you combine 30.5cm and 35.6cm is still under investigations.
Last Updated: April 29th 2018															Made by: Tsubakura

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

$W = \sum^{\text{All Classes}} \left ( C_{k} M_{k} \sqrt{N_{k}} \right ) \%$

Where:

• $W$ is the resulting fit bonus or overweight penalty
• $C_{k}$ 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.
• $M_{k}$ 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.
• $N_{k}$ is the number of equipped guns for that gun class.

Cruisers

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

Ship Class	12.7cm Twin (LM)		14cm Single 15.2cm		14cm Twin 14cm Twin Kai 15.2cm 15.2cmK		Bofors 15.2cm		15.5cm 15.5cmK		20.3cm 20.3cm(2) 20.3cm(3)		203mm/53
	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night
Ooyodo Class	+2 +2N		+4N +1		+2 +2		??		+2		-2 -2N		0
Agano Class	+2 +2N		+4N +1		+5 +2N +2		??		-2 -2N		-2 -2N		0
All other CL(T)	+2 +2N		+4N +1		+2 +2		+3 ??		-2 -2N		-2 -2N		-2 -2.5N??
Mogami Class	0		0		0		0		+2		0	Template:Nowrap	0
Mogami Class (K2)	0		0		0		0		+5				0
Zara Class	0		0		0		0		??				+1 +1
All other CA(V)	0		0		0		0		??				0
Seaplane Tenders (AV)	??		??		-2??		0		-4 -10N		-4 -10N		??
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 means 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 this spreadsheet maintained by Dewy with the relevant sources linked in the spreadsheet. As of 13th December the hidden firepower bonus of 14cm Twin Gun Mount Kai does not work/does not exist.
Last Updated: December 7th 2018	Made by: Tsubakura

Single Mount High-Angle Bonus

As of June 23, Yura and Mutsuki/Kamikaze-class destroyers gain fit bonuses from having single mount equipped.

Ship	12.7cm Single HA Mount (Late Model)
Satsuki K2	+5
Other Mutsuki-Class	??
Kamikaze-Class	??
Yura K2	+4 +10N
Light Cruisers (CL)	+4N
Unknown factors: Only Yura K2 and Satsuki K2 were tested. 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 12.7cm Single Gun Mount gives a fit bonus or not.
Last Updated: November 7th 2017	Made by: Tsubakura

Small Caliber Guns

Some small caliber main guns grant additional stats to certain ships and ship classes.

Ship	12cm Single K2
Shimushu-class Etorofu-class	Normal	+1 +1 +2
	w/ Radar	+3 +1 +1 +5
Mutsuki-class Kamikaze-class	Normal	+2 +1 +3
	w/ Radar:	+4 +1 +1 +6
	w/ 53cm Twin x1:	+4 +4 +1 +3
	w/ 53cm Twin x2:	+5 +7 +1 +3

Ship	12.7cm Twin Model A K2				12.7cm Twin Model A K3 + AAFD
Fubuki-class	Normal	+1			Normal	+2 +2
	w/ Radar	+2 +1 +2			w/ Air Radar	+2 +8
					w/ Radar	+5 +1 +2
	w/ 61cm Triple x1	+2 +3			w/ 61cm Triple x1	+3 +3 +2
	w/ 61cm Triple x2	+3 +5			w/ 61cm Triple x2	+4 +5 +2
	w/ 61cm Triple LM x1	+2 +4			w/ 61cm Triple LM x1	+3 +4 +2
	w/ 61cm Triple LM x2	+3 +6			w/ 61cm Triple LM x2	+4 +6 +2
Ayanami-class Akatsuki-class					Normal	+2 +2
					w/ Air Radar	+2 +8
					w/ Air Radar	+5 +1 +2 +2
					w/ 61cm Triple x1	+3 +3 +2
					w/ 61cm Triple x2	+4 +5 +2
					w/ 61cm Triple LM x1	+3 +4 +2
					w/ 61cm Triple LM x2	+4 +6 +2
Note: "61cm Triple" refers to either the 61cm Triple Torpedo Mount or the 61cm Triple (Oxygen) Torpedo Mount; both provide the same bonus alongside the relevant equipment. The Late Model variant, however, provides different bonuses.

Ship	12.7cm Twin Model B K2
Shiratsuyu Kai Ni Murasame Kai Ni	+1
Shigure Kai Ni	+1
Yuudachi Kai Ni	+1 +1 +1 +2
Kawakaze Kai Ni	+2
Ayanami-class Akatsuki-class Hatsuharu-class	+1

Ship	12.7cm Twin Model K B4 + AAFD
Shiratsuyu Kai Ni	Normal	+2 +2
	w/ Air Radar	+2 +6 +2
	w/ Radar	+3 +3 +4
	w/ 61cm Quad (Oxy) or LM	+3 +3 +2
Shigure Kai Ni	Normal	+2 +1 +1
	w/ Air Radar	+2 +7 +1
	w/ Radar	+3 +3 +1 +3
	w/ 61cm Quad (Oxy) or LM	+3 +3 +1 +1
Murasame Kai Ni	Normal	+1 +1 +2
	w/ Air Radar	+1 +7 +2
	w/ Radar	+2 +3 +1 +4
	w/ 61cm Quad (Oxy) or LM	+2 +3 +1 +2
Yuudachi Kai Ni	Normal	+2 +1 +1
	w/ Air Radar	+2 +1 +6 +1
	w/ Radar	+3 +4 +3
	w/ 61cm Quad (Oxy) or LM	+3 +4 +1
Kawakaze Kai Ni	Normal	+1 +2
	w/ Air Radar	+1 +6 +2
	w/ Radar	+2 +3 +4
	w/ 61cm Quad (Oxy) or LM	+2 +3 +2
Shiratsuyu-class Hatsuharu-class	Normal	+1 +1
	w/ Air Radar	+1 +5 +1
	w/ Radar	+2 +2 +3
	w/ 61cm Quad (Oxy) or LM	+2 +3 +1
Ayanami-class Akatsuki-class	Normal	+1
	w/ Air Radar	+1 +5
	w/ Radar	+2 +2 +2
	w/ 61cm Quad (Oxy) or LM	+2 +3
Note: No additional bonus from equipping multiple torpedoes.

These tables show the visible stat bonuses for using certain equipment on certain ships/ship classes. These bonuses are added onto the regular stats of the equipment; this table does not show the total stats gained from the equipment. Hidden stat bonuses are not included. "Radar" refers to any radar with an accuracy stat greater than or equal to 3, while "Air Radar" specifically requires a radar classified as an air radar. If multiple combinations of listed equipment is equipped, the highest bonus is given.

Last Updated: August 15, 2018 by Drakylon