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Hidden fit bonus 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 Values with a question mark are lacking enough data and so may be outdated and/or erroneous. The developers have also adjusted hidden fits multiple times. |
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
, and some also affect Firepower
.
- 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 size of the gun (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 (F)BB(V) Bonuses
Battleships receive accuracy bonuses if the guns are fit and penalties if it is overweight[1].
Ship Class | IJN 35.6 cm![]() ![]() ![]() |
Fr 38 cm![]() ![]() |
RM 381 mm![]() ![]() |
IJN 41 cm | USN 16 in Twin | USN 16 in Triple | RN 16 in | IJN 46 cm | 51 cm Twin![]() ![]() |
51 cm Triple![]() | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
basic![]() ![]() ![]() |
Triple K2![]() |
Twin K2![]() |
Mk.I![]() |
Mk.V![]() |
Mk.VIII![]() |
Mk.7![]() |
Mk.7 +GFCS ![]() |
Mk.6 mod.2 ![]() |
Mk.I![]() |
+AFCT![]() |
Kai +FCR ![]() |
Proto![]() |
46cm![]() |
Kai![]() | ||||||
Gangut-class | +7 Sov 30.5 cm: +10 |
0 | +1 | -7 | ?? | -5 | ?? | -3 | -9~10? | ?? | ?? | -7 | -18 | ?? | N/A | |||||
Kongou-class | +7 | 0 | -2 | -5 | -5? | -5 | -6~7? | -5 | -6 | -3 | -7 | -10 | -10? | |||||||
Bismarck-class Vittorio Veneto-class |
+4 | 0? | +1 | -5 | -5 | -4? | -5 | ?? | ?? | -7 | -10 | ?? | ||||||||
Iowa-class | +4? | 0? | -2? | -5 | 0 | +2 | -7 | -10 | ?? | |||||||||||
Colorado-class | +1 | +2 | -2 | ?? | ?? | -7 | ||||||||||||||
South Dakota-class | -5 M: +4.6 |
?? | ?? | ?? | ||||||||||||||||
Richelieu-class | +4 | +4~5 | -2 | -2 | -5 | -7 | -14? | -8 | -7 | -10 | ?? | |||||||||
Queen Elizabeth-class | +6 RN 38.1 cm: +8 |
+1~2 | +2 | -2? | +5 | ?? | +3~4 | -8 | -11 | ?? | ||||||||||
Nelson-class | 0 | 0 | +3? | 0 | 0 | ?? | ?? | ?? | ||||||||||||
Fusou-class Kai/Ni Ise-class Kai |
+4 | 0 | +2 | +2 | 0 | 0? | -3 | -7 F+: -11? |
-4? | |||||||||||
Ise-class Kai Ni | +4? | 0 | +1? | +4? | +4? | +6 | +2 | ?? | -7 F+: -11? |
?? | ||||||||||
Fusou-class base Ise-class base |
+2 | 0 | +2 | +2 | +2 | +2? | +3 | -3 | -7 | ?? | ||||||||||
Nagato-class base/Kai | 0 | ?? | ||||||||||||||||||
Nagato-class Kai Ni | +2? | 0 | +1? | +5 | +5 | +5~6 | Mutsu: +3 | ?? | ?? | 0 | +4 | -2? | -4? | -6? | Nagato: -5 Mutsu: -8 |
?? | ||||
Yamato-class | 0 | +3 | +3 | +7 | 0 | ?? | ||||||||||||||
Yamato Kai Ni![]() |
0 | ?? | -7 | ?? | ?? | -10 |
- The table shows an estimated accuracy fit bonus based on having one fit gun equipped.
- For married ships, the overweight penalty is generally reduced by 40%:
- E.g. a married Kongou with a 46 cm receives -6 instead of -10,
- Some exceptions will receive a bonus instead of a penalty on certain guns after marriage.
- If more than one gun of the same class is used, multiply the modifier by the square root of the number of guns:
- E.g. a Kongou with two IJN 35.6 cm equipped receives √2 x 7 = 9.89.
- If guns from different classes are used together, add the modifiers together.
- E.g. a Kongou with 35.6 cm and 41 cm mixed receives 7 - 5 = 2.
- Exceptions arise where different guns of the same class give different bonuses on certain ships, notably Gangut, with what happens when combining 30.5 cm and 35.6 cm is still under investigation.
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]
With:
- [math]\displaystyle{ W }[/math] the resulting fit bonus or overweight penalty
- [math]\displaystyle{ C_{k} }[/math] 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] 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] 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/planned 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.
![]() | ||||
---|---|---|---|---|
Nation | Class | Caliber | Twin | Triple |
Japanese | Kongou-class Fusou-class Ise-class |
35.6 cm | ||
Fusou-class Kai Ni Ise-class Kai Ni Nagato-class |
41 cm | |||
Yamato-class | 46 cm | |||
Yamato-class Kai Ni | 51 cm | |||
US | Colorado-class | 40,64 cm | ||
North Carolina-class South Dakota-class |
||||
Iowa-class | ||||
British | Queen Elizabeth-class | 38.1 cm | ||
Nelson-class | 40,64 cm | |||
Italian | Conte di Cavour-class | 30.5 cm | ||
32 cm | ||||
Vittorio Veneto-class | 38.1 cm | |||
German | Bismarck-class | 38 cm | ||
French | Richelieu-class | 38 cm | '"Double Twin Guns" in a Quadruple Mount. |
|
Russian | Gangut-class | 30.5 cm |
Cruiser Bonuses
Notes:
- Future Medium Guns may fall in one of those categories based on similarities like caliber and number of guns.
Light Cruisers (CL/CLT/CT)
Accuracy bonuses for Light Cruisers (CL), Torpedo Cruisers (CLT), and Training Cruisers (CT).
Ships | Guns group[1] | 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 | |
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.
- ↑ Changing gun order does not affect the final bonus
- ↑ Light Cruiser Tsu-Class
- ↑ Light Cruiser Ho-Class, Light Cruiser He-Class, Light Cruiser To-Class, Torpedo Cruiser Chi-Class
Firepower bonuses for Light Cruisers (CL), Torpedo Cruisers (CLT), and Training Cruisers (CT).
Ships | 14cm Single![]() |
14cm Twin /Kai![]() ![]() ![]() ![]() |
---|---|---|
CL(T)/CT | +1![]() |
+2![]() |
Heavy Cruisers (CA/CAV)
Accuracy 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 | 14cm Twin /Kai![]() ![]() |
15.2 cm /Kai![]() ![]() |
C | IJN 20.3 cm![]() ![]() ![]() |
203mm/53![]() |
G | |
---|---|---|---|---|---|---|---|
Day | Night | ||||||
CA(V) | 0 | +5 +5N? | 0 | ||||
Mogami-class | +2 | ||||||
Mogami-class Kai Ni | +5 | ||||||
Zara-class | +1 | ||||||
AV/Kamoi (AO) | -6N | -6N | -8 -10N | -8 -10N? |
- 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
- E.g. 2 guns of 2N = 4 Acc
- Bonuses from guns of different classes are simply added together.
- The night fit bonus from the IJN 20.3 cm series used to be capped at +15%. However, it is unknown whether this cap has been removed or not from the recent updates.
- It is possible that certain fit categories only work during the day, but there is no concrete data proving it yet.
- It is alternatively possible that the night bonus from the IJN 20.3cm series overrides any other categories.
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 | 203mm/53![]() |
---|---|
Zara-class | +1 |
12.7 cm HA Late Models
As of 2017/06/23, Yura Kai Ni, Mutsuki-classes, and Kamikaze-classes gain accuracy bonuses with some main Late Models High Angle 12.7 cm guns
.
Ship | 12.7 cm Single HA Mount (LM)![]() |
12.7 cm Twin HA Mount (LM)![]() |
---|---|---|
CL(T)/CT | +4N![]() |
+2 +2N |
Yura Kai Ni![]() |
+4 +10N![]() | |
Mutsuki-class | +5![]() |
|
Kamikaze-class | ?? |
Notes:
- Only Yura Kai Ni
and Satsuki 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).
- It is unknown whether the 12.7 cm Single HA
gives any bonus.
Source: [7]
Destroyer Bonuses
Certain destroyers 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/Verniy![]() ![]() |
![]() ![]() |
5 |
Fletcher-class![]() ![]() |
![]() ![]() ![]() ![]() |
4[1] |
John C. Butler-class![]() |
4[2] | |
J-class![]() ![]() |
![]() ![]() |
3 |
![]() ![]() ![]() ![]() |
3 [3] | |
Mutsuki-class | ![]() ![]() |
5 |
- ↑ 2x base 5" Gun
on Fletcher-class gives ~10 accuracy. This is potentially a bug.
- ↑ Samuel B.Roberts does not seem to receive any bonus from base 5" Gun
. This is possibly a bug (maybe related to the bug on Fletcher-class).
- ↑ There are not enough samples on more than one ASDICs
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 Kai
.
See Also
Main data sources :
- https://docs.google.com/spreadsheets/d/11-nekeN0IBLtzdxxIzV0Gm3T7U4BpCrYA1lGsQYAEJo/edit#gid=1753647821
- https://docs.google.com/spreadsheets/d/1tN3X92q9zaWC0IMHfgw-dSqWnuscgKJT7ZOf9M9_Hjk/edit#gid=0
- https://docs.google.com/spreadsheets/d/1M0YSCVlnul4Usb8MZ8oluCJAUXyvhU-7MJ4Plcuipds/edit#gid=0
- https://docs.google.com/spreadsheets/d/11-nekeN0IBLtzdxxIzV0Gm3T7U4BpCrYA1lGsQYAEJo
- https://docs.google.com/spreadsheets/d/1Xm5VRj1FwgwlRISAyuwJgOJiBgOGOcGQJNcJ-pZHGFo/edit#gid=0