Construction

Construction Menu as shown

Large Ship Construction Menu as shown

Construction is accessible from the Arsenal menu and allows building new ship girls. Note that not all ships are available from construction, some being drops from normal maps, and others event exclusive (see below for details).

• For a more comprehensive list of construction recipes and rates, please see PoiDB's construction page.

Constructing a girl costs a selectable amount of the 4 main Resources as well as "development materials" . It will also take a variable amount of time unless instant constructions are used.

• Every player starts off with only 2 construction slots. Up to 2 more slots can be unlocked by using a Dock Opening Key for each.

Construction Types

Two types of ship construction are possible, "Normal Construction" and "Large Ship Construction" (LSC), the former being the most used and cheaper one, and the later being the most expensive with the greatest results.

Normal Construction

"Normal Construction" is the basic construction method. Recipes range from 30-999 fuel , ammo , steel and bauxite and each attempt costs 1 development material . Speeding up construction costs 1 instant construction .

• If applicable, it is often more resource efficient to find a desired ship in sorties as a drop rather than building them.

Construction Theory

In normal construction, there are 4 pools determining the ship being crafted. Each group has exactly 100 unique ships and the available pools remain the same regardless of which Secretary used (excepted for the Z1-class). The selection of a pool is based on the resource input during the construction:

• Pool 1 - 300+ , 400+ , 300+ ,
• Pool 2 - 400+ , 600+ ,
• Pool 3 - 250+ , 200+ ,
• Pool 4 - Do not meet any of the above requirements.
• Note: The check is done from top to bottom, if the requirements of multiple pools are fulfilled, only the topmost one is used.

The constructed ship is selected in the pool by a value called "[math]\displaystyle{ ID }[/math]" which can go from 1 to 100, calculated by substating two random values:

[math]\displaystyle{ ID }[/math] Calculation
[math]\displaystyle{ ID = Rand [0 ; 100] - Rand [0 ; Res - 1] }[/math] With [math]\displaystyle{ Rand }[/math] the function returning a random whole number between its boundaries, included, [math]\displaystyle{ Res }[/math] a whole number that is incremented by having low/high resource inputs of certain types, defined below, The resources used to increment this value depend on the pool that has been selected. In case [math]\displaystyle{ ID }[/math] is 0 or negative, the value will be converted back into a positive value and incremented by 2.
Which resources that are used to increment value [math]\displaystyle{ Res }[/math] is dependent on the pool that has been selected: Pool 1: [math]\displaystyle{ Res = MAX \Bigg( \Bigg| \Bigg\lceil \frac{Steel-400}{25} \Bigg\rceil + \Bigg\lceil \frac{Baux-300}{20} \Bigg\rceil \Bigg| ; 51\Bigg) }[/math] Pool 2: [math]\displaystyle{ Res = MAX \Bigg( \Bigg| \Bigg\lceil \frac{Ammo-400}{25} \Bigg\rceil + \Bigg\lceil \frac{Steel-600}{30} \Bigg\rceil \Bigg| ; 51\Bigg) }[/math] Pool 3: [math]\displaystyle{ Res = MAX \Bigg( \Bigg| \Bigg\lceil \frac{Ammo-200}{13} \Bigg\rceil + \Bigg\lceil \frac{Steel-200}{20} \Bigg\rceil \Bigg| ; 51\Bigg) }[/math] Pool 4: [math]\displaystyle{ Res = MAX \Bigg( \Bigg| \Bigg\lceil \frac{Fuel-100}{10} \Bigg\rceil + \Bigg\lceil \frac{Steel-30}{15} \Bigg\rceil \Bigg| ; 51\Bigg) }[/math] Source: [1]

Pratical Conclusion

• Only 2 resources will have an effect depending on the pool. Changing the two others will have no effect as long as it does not change the pool.
• Of the two resources that have an effect, one has a bigger effect than the other.
  • The effect is capped, above a certain threshold increasing the resources further will not have any effect.
• The effect of changing resources will increase the drop of some ships by reducing the drop of others.
• The direct consequence of the round-up is that the effect of resources works by steps starting from the minimum recipe plus one.
  • Increasing the resource of a recipe by an amount inferior to the step has no effect.
  • The steps are as follows:
    • Pool 1: 25 , 20
    • Pool 2: 25 , 30
    • Pool 3: 13 , 20
    • Pool 4: 10 , 15

Construction Pools

Construction Pools List
Ship	Name	Type	Pool 4 "Light"	Pool 3 "Special"	Pool 2 "Heavy"	Pool 1 "Aviation"
	Mutsuki	DD	✔️	❌	❌	❌
	Kisaragi	DD	✔️	❌	❌	❌
	Satsuki	DD	✔️	❌	❌	❌
	Fumizuki	DD	✔️	❌	❌	❌
	Nagatsuki	DD	✔️	❌	❌	❌
	Kikuzuki	DD	✔️	❌	❌	❌
	Mikazuki	DD	✔️	❌	❌	❌
	Mochizuki	DD	✔️	❌	❌	❌
	Yayoi	DD	✔️	❌	❌	❌
	Fubuki	DD	✔️	❌	❌	✔️
	Shirayuki	DD	✔️	❌	❌	✔️
	Hatsuyuki	DD	✔️	❌	❌	✔️
	Miyuki	DD	✔️	❌	❌	✔️
	Murakumo	DD	✔️	❌	❌	✔️
	Isonami	DD	✔️	❌	❌	✔️
	Ayanami	DD	✔️	❌	❌	✔️
	Shikinami	DD	✔️	❌	❌	✔️
	Oboro	DD	✔️	❌	❌	❌
	Akebono	DD	✔️	❌	❌	❌
	Sazanami	DD	✔️	❌	❌	❌
	Ushio	DD	✔️	❌	❌	❌
	Akatsuki	DD	✔️	❌	❌	✔️
	Hibiki	DD	✔️	❌	❌	✔️
	Ikazuchi	DD	✔️	❌	❌	✔️
	Inazuma	DD	✔️	❌	❌	✔️
	Hatsuharu	DD	✔️	❌	❌	✔️
	Nenohi	DD	✔️	❌	❌	❌
	Wakaba	DD	✔️	❌	❌	❌
	Hatsushimo	DD	✔️	❌	❌	❌
	Shiratsuyu	DD	✔️	❌	❌	✔️
	Shigure	DD	✔️	❌	❌	✔️
	Murasame	DD	✔️	❌	❌	❌
	Yuudachi	DD	✔️	❌	❌	❌
	Samidare	DD	✔️	❌	❌	❌
	Suzukaze	DD	✔️	❌	❌	✔️
	Asashio	DD	✔️	❌	❌	❌
	Ooshio	DD	✔️	❌	❌	❌
	Michishio	DD	✔️	❌	❌	❌
	Arashio	DD	✔️	❌	❌	❌
	Arare	DD	✔️	❌	❌	❌
	Kasumi	DD	✔️	❌	❌	❌
	Kagerou	DD	✔️	❌	❌	✔️
	Shiranui	DD	✔️	❌	❌	✔️
	Kuroshio	DD	✔️	❌	❌	❌
	Akigumo	DD	✔️	❌	❌	✔️
	Yukikaze	DD	❌	✔️	❌	❌
	Shimakaze	DD	❌	✔️	❌	❌
	Z1	DD	❌	✔️	❌	❌
	Z3	DD	❌	✔️	❌	❌
	Tenryuu	CL	✔️	✔️	❌	❌
	Tatsuta	CL	✔️	✔️	❌	❌
	Kuma	CL	✔️	✔️	✔️	✔️
	Tama	CL	✔️	✔️	✔️	✔️
	Kitakami	CL	✔️	✔️	✔️	✔️
	Ooi	CL	❌	✔️	❌	❌
	Kiso	CL	✔️	✔️	✔️	✔️
	Nagara	CL	✔️	✔️	✔️	✔️
	Isuzu	CL	✔️	✔️	✔️	✔️
	Natori	CL	✔️	✔️	✔️	✔️
	Yura	CL	✔️	✔️	✔️	❌
	Kinu	CL	❌	✔️	❌	✔️
	Abukuma	CL	❌	✔️	❌	✔️
	Sendai	CL	✔️	✔️	✔️	✔️
	Jintsuu	CL	✔️	✔️	✔️	✔️
	Naka	CL	✔️	✔️	✔️	✔️
	Yuubari	CL	✔️	❌	❌	✔️
	Katori	CT	❌	✔️	❌	❌
	Furutaka	CA	❌	✔️	✔️	❌
	Kako	CA	❌	✔️	✔️	✔️
	Aoba	CA	❌	✔️	✔️	❌
	Kinugasa	CA	❌	✔️	✔️	❌
	Myoukou	CA	❌	✔️	✔️	❌
	Nachi	CA	❌	✔️	✔️	❌
	Ashigara	CA	❌	✔️	✔️	❌
	Haguro	CA	❌	✔️	✔️	❌
	Takao	CA	❌	✔️	✔️	❌
	Atago	CA	❌	✔️	✔️	❌
	Maya	CA	❌	✔️	✔️	❌
	Choukai	CA	❌	✔️	✔️	❌
	Mogami	CA	❌	✔️	✔️	✔️
	Kumano	CA	❌	❌	✔️	❌
	Suzuya	CA	❌	❌	✔️	❌
	Tone	CA	❌	✔️	✔️	✔️
	Chikuma	CA	❌	✔️	✔️	✔️
	Kongou	FBB	❌	❌	✔️	❌
	Hiei	FBB	❌	❌	✔️	❌
	Haruna	FBB	❌	❌	✔️	❌
	Kirishima	FBB	❌	❌	✔️	❌
	Fusou	BB	❌	❌	✔️	❌
	Yamashiro	BB	❌	❌	✔️	❌
	Ise	BB	❌	❌	✔️	❌
	Hyuuga	BB	❌	❌	✔️	❌
	Nagato	BB	❌	❌	✔️	❌
	Mutsu	BB	❌	❌	✔️	❌
	Shouhou	CVL	❌	❌	❌	✔️
	Ryuujou	CVL	❌	❌	❌	✔️
	Shouhou	CVL	❌	❌	❌	✔️
	Zuihou	CVL	❌	❌	❌	✔️
	Hiyou	CVL	❌	❌	❌	✔️
	Junyou	CVL	❌	❌	❌	✔️
	Akagi	CV	❌	❌	❌	✔️
	Kaga	CV	❌	❌	❌	✔️
	Souryuu	CV	❌	❌	❌	✔️
	Hiryuu	CV	❌	❌	❌	✔️
	Shoukaku	CV	❌	❌	❌	✔️
	Zuikaku	CV	❌	❌	❌	✔️
	I-168	SS	❌	✔️	❌	❌
	I-8	SS	❌	✔️	❌	❌
	I-58	SS	❌	✔️	❌	❌
	Chitose	AV	❌	❌	❌	✔️
	Chiyoda	AV	❌	❌	❌	✔️

Large Ship Construction

"Large Ship Construction" (LSC) allows to build rarer "bigger" ships in exchange for more resources. Recipes range from 1500-7000 fuel and ammo ; 2000-7000 steel and 1000-7000 bauxite . Each attempt also costs either 1, 20, or 100 development materials . Speeding up construction costs 10 instant construction .

• LSC is unlocked by completing quest F10.
• According to the developers, having empty construction docks very slightly increases the chances of obtaining rarer ships [2]. This statement has not been fully tested yet.

• Construction results are solely determined by the amount of resources and devmats used.
  • For few ships, an exact Secretary is required in order to be built, see below.

LSC Construction Theory

LSC works similarly to normal construction, there are 4 pools determining the ship being crafted. Each group has exactly 100 unique ships and the available pools remain the same regardless of which Secretary used The selection of a pool is based on the resource input during the construction:

• Pool 1 - > [math]\displaystyle{ 2400+Rand[0;1200] }[/math], > [math]\displaystyle{ 1050+Rand[0;900] }[/math], > [math]\displaystyle{ 2800+Rand[0;1400] }[/math], > [math]\displaystyle{ 2800+Rand[0;2400] }[/math];
• Pool 2 - > [math]\displaystyle{ 2240+Rand[0;1120] }[/math], > [math]\displaystyle{ 2940+Rand[0;2520] }[/math], > [math]\displaystyle{ 4400+Rand[0;2200] }[/math], > [math]\displaystyle{ 1050+Rand[0;900] }[/math], > 20;
• Pool 3 - > [math]\displaystyle{ 1920+Rand[0;960] }[/math], > [math]\displaystyle{ 2240+Rand[0;1920] }[/math], > [math]\displaystyle{ 3040+Rand[0;1520] }[/math], > [math]\displaystyle{ 910+Rand[0;780] }[/math];
• Pool 4 - Do not meet any of the above requirements.
• Note: The check is done from top to bottom, if the requirements of multiple pools are fulfilled, only the topmost one is used.

The constructed ship is selected in the pool by a value called "[math]\displaystyle{ ID }[/math]" which can go from 1 to 100, calculated by subtracting two random values:

[math]\displaystyle{ ID }[/math] Calculation
[math]\displaystyle{ ID = Rand [a ; b] - MAX \big( Rand [0 ; Res - 1] ; 50 \big) }[/math] With [math]\displaystyle{ a,b }[/math] depend on the number of construction docks "open" (either empty or finished): [math]\displaystyle{ a,b }[/math] Nb dock [math]\displaystyle{ a }[/math] [math]\displaystyle{ b }[/math] 1 3 99 2 1 99 3 1 95 4 1 91 [math]\displaystyle{ Rand }[/math] the function returning a random whole number between its boundaries, included, [math]\displaystyle{ Res }[/math] a whole number that is incremented by having low/high resource inputs of certain types, defined below, The resources used to increment this value depend on the pool that has been selected. Note that if [math]\displaystyle{ Res\lt 1 }[/math] then the result of [math]\displaystyle{ Rand [0 ; Res - 1] }[/math] is zero. In case [math]\displaystyle{ ID }[/math] is 0 or negative, the value will be converted back into a positive value and incremented by 2.
In LSC every resource (including ) are used to increment value [math]\displaystyle{ Res }[/math] only the weight depend on the pool: Pool 1: [math]\displaystyle{ Res = (Fuel-3000) \times 0.003 + (Ammo-2000) \times 0.003 + (Steel-4000) \times 0.004 + (Baux-5000) \times 0.005 + (DevMat-50) \times 0.1 }[/math] Pool 2: [math]\displaystyle{ Res = (Fuel-3500) \times 0.005 + (Ammo-4500) \times 0.005 + (Steel-5500) \times 0.004 + (Baux-2200) \times 0.002 + (DevMat-60) \times 0.1 }[/math] Pool 3: [math]\displaystyle{ Res = (Fuel-4000) \times 0.003 + (Ammo-3000) \times 0.003 + (Steel-4000) \times 0.003 + (Baux-1800) \times 0.002 + (DevMat-40) \times 0.2 }[/math] Pool 4: [math]\displaystyle{ Res = (Fuel-2000) \times 0.002 + (Ammo-2500) \times 0.002 + (Steel-3000) \times 0.002 + (Baux-1500) \times 0.002 + (DevMat-40) \times 0.2 }[/math] Source: [3]

Large Ship Construction Pools

Large Ship Constructions Pools List
N°	Ship	Name	Type	Pool 4	Pool 3	Pool 2	Pool 1
163		Maruyu	SS	✔️	✔️	✔️	✔️
155		I-401	SSV	❌	✔️	❌	❌
137		Agano	CL	✔️	✔️	✔️	❌
138		Noshiro	CL	✔️	✔️	✔️	❌
139		Yahagi	CL	✔️	✔️	✔️	❌
154		Katori	CT	✔️	❌	❌	❌
265		Kashima	CT	?	?	?	?
51		Mogami	CA	✔️	❌	❌	❌
116		Mikuma	CA	✔️	❌	❌	❌
124		Suzuya	CA	✔️	✔️	❌	❌
125		Kumano	CA	✔️	✔️	❌	❌
63		Tone	CA	✔️	❌	❌	❌
64		Chikuma	CA	✔️	❌	❌	❌
248		Zara	CA	❌	✔️	❌	❌
21		Kongou	FBB	✔️	✔️	✔️	❌
22		Hiei	FBB	✔️	✔️	✔️	❌
23		Haruna	FBB	✔️	✔️	✔️	❌
24		Kirishima	FBB	✔️	✔️	✔️	❌
171		Bismarck	FBB	❌	❌	✔️	❌
26		Fusou	BB	✔️	✔️	✔️	❌
27		Yamashiro	BB	✔️	✔️	✔️	❌
3		Ise	BB	✔️	✔️	✔️	❌
4		Hyuuga	BB	✔️	✔️	✔️	❌
1		Nagato	BB	✔️	✔️	✔️	❌
2		Mutsu	BB	✔️	✔️	✔️	❌
131		Yamato	BB	❌	✔️	✔️	❌
143		Musashi	BB	❌	❌	✔️	❌
239		Warspite	BB	❌	❌	✔️	❌
30		Ryuujou	CVL	❌	❌	❌	✔️
65		Hiyou	CVL	❌	❌	❌	✔️
66		Junyou	CVL	❌	❌	❌	✔️
94		Shouhou	CVL	❌	❌	❌	✔️
112		Zuihou	CVL	❌	❌	❌	✔️
6		Akagi	CV	❌	❌	❌	✔️
7		Kaga	CV	❌	❌	❌	✔️
8		Souryuu	CV	❌	❌	❌	✔️
9		Hiryuu	CV	❌	❌	❌	✔️
106		Shoukaku	CV	❌	❌	❌	✔️
107		Zuikaku	CV	❌	❌	❌	✔️
153		Taihou	CV	❌	❌	❌	✔️
233		Saratoga	CV	❌	❌	❌	✔️
315		Ark Royal	CV	❌	❌	❌	✔️
251		Mizuho	AV	❌	❌	❌	✔️
161		Akitsu Maru	LHA	❌	✔️	✔️	✔️
162		Kamoi	AO	❌	❌	❌	✔️
260		Hayasui	AO	?	?	?	?

Special Secretary

Some ships require a specific Secretary (1st fleet flagship) in order to be crafted.

• For any other construction, the Secretary is independent of the crafting result.

Special Construction Requirements
	Required Secretary	Ship added to craft pool	Notes
Normal Construction	Z1	Z3	Quest D8 MUST be completed first.[citation needed]
	Z3	Z1
Large Ship Construction	Z1 Z3	Bismarck
	Libeccio Pola	Zara
	Kamoi Iowa	Saratoga
	Kongou Kai Ni	Warspite	Kongou must be Kai Ni/C
	Warspite	Ark Royal

Construction Timers

The times below reflect the type of ship or specific ship you will obtain after hitting the build button.

Time	Ship Type	Result	Note
00:17:00	Submarine	Maruyu	LSC
00:18:00	Destroyer	Mutsuki-class
00:20:00		Fubuki-class , Ayanami-class , Akatsuki-class , Hatsuharu-class
00:22:00		Shiratsuyu-class , Asashio-class
	Submarine	I-168, I-8, I-58
00:24:00	Destroyer	Kagerou-class , Z1-class
00:30:00		Shimakaze
01:00:00	Light Cruiser	Tenryuu-class , Kuma-class , Nagara, Natori, Yura, Sendai-class
		Agano-class	LSC
	Heavy Cruiser	Furutaka-class , Aoba-class
01:10:00	Training Cruiser	Katori
		Kashima	LSC
	Heavy Cruiser	Zara	LSC
01:15:00	Light Cruiser	Kinu, Abukuma
01:20:00	Heavy Cruiser	Myoukou-class
01:22:00	Light Cruiser	Yuubari
01:25:00	Heavy Cruiser	Takao-class
01:30:00		Mogami, Suzuya, Kumano, Tone-class
		Mikuma	LSC
02:00:00	Light Aircraft Carrier	Houshou
02:20:00	Seaplane Tender	Chitose, Chiyoda
		Mizuho	LSC
	Fleet Oiler	Kamoi	LSC
02:30:00	Amphibious Assault Ship	Akitsu Maru	LSC
02:40:00	Light Aircraft Carrier	Shouhou-class
02:50:00		Ryuujou
03:00:00		Hiyou-class
03:20:00	Aircraft Carrying Submarine	I-401	LSC
03:40:00	Fleet Oiler	Hayasui	LSC
04:00:00	Fast Battleship	Kongou-class
04:10:00	Regular Aircraft Carrier	Souryuu, Hiryuu
		Ark Royal	LSC
04:20:00	Battleship	Fusou-class
	Regular Aircraft Carrier	Kaga
04:30:00	Battleship	Ise-class
	Regular Aircraft Carrier	Akagi
04:40:00	Battleship	Warspite	LSC
05:00:00	Battleship	Nagato-class
		Bismarck	LSC
05:30:00	Regular Aircraft Carrier	Saratoga	LSC
06:00:00	Regular Aircraft Carrier	Shoukaku-class
06:40:00	Armored Aircraft Carrier	Taihou	LSC
08:00:00	Battleship	Yamato-class	LSC

Ship Availability

• Some ships are rewarded in Quests.
• Several ships are currently dropable for a limited time, see here.
• Some ships may become buildable in future updates.

See Also

• Poi-Statistics Database
• Common Recipes