Docking

Docking (repair) will restore your ships to full health, at the expense of time, fuel and steel.

Repair time

Confirmation window for repairs

[math]\displaystyle{ \text {Total repair time} = \text {HP loss} \times \text {base repair time} \times \text {ship type multiplier} + \text {30 seconds} }[/math] [math]\displaystyle{ \text {Base repair time} = \text {Level} \times 10 \text {(if Level } \le \text {11); } \text {Level} \times 5 + floor (\sqrt {Level - 11}) \times 10 + 50 \text { (if Level } \ge \text {12)} }[/math]

Ship Type	Multiplier
Battleships, Aviation Battleships, Aircraft Carriers, Repair Ships	2
Heavy Cruisers, Aviation Cruisers, Fast Battleships, Light Aircraft Carriers, Submarine Tenders	1.5
Light Cruisers, Destroyers, Submarine Aircraft Carriers, Seaplane Tenders, Amphibious Assault Ships, Torpedo Cruisers	1
Submarines	0.5

Repair cost

[math]\displaystyle{ \text {Fuel cost} = floor(\text {Base fuel cost} \times \text {HP loss} \times 0.032) }[/math]
[math]\displaystyle{ \text {Steel cost} = floor\text {Base fuel cost} \times \text {HP loss} \times 0.06), }[/math] where base fuel cost is the amount of fuel needed to resupply that ship from 0 to full.
The cost is rounded down when using dry docks, so most destroyers and submarines with only 1 HP loss can be repaired for free.
The cost is not affected by the level of the ship.

Ship Repair Cost per HP (assuming max remodel level)
Type	Class	Cost
Destroyers	Shimakaze Amatsukaze Akitsuki Z1-class	0.64	1.2
	Others	0.48	0.9
Light Cruisers	Ooyodo	1.12	2.1
	Agano-class	0.96	1.8
	Others	0.8	1.5
Torpedo Cruisers	(all)	0.8	1.5
Heavy Cruisers	Furutaka-class Aoba-class	1.12	2.1
	Tone-class Kai Myoukou-class Kai Ni	1.44	2.7
	Prinz Eugen	1.76	3.3
	Others	1.28	2.4
Aviation Cruisers	(all)	1.6	3
Battleships	Ise-class Fusou-class	2.72	5.1
	Nagato-class Kongou-class	3.2	6
	Bismarck zwei	3.36	6.3
	Bismarck drei	3.52	6.6
	Vittorio Veneto-class	4.16	7.8
	Yamato-class	8	15
Aviation Battleships	Ise-class Kai	3.04	5.7
	Fusou-class Kai Ni	3.36	6.3
Submarines	(all)	0.3	0.8
Submarine Aircraft Carriers	I-401	0.8	1.5
	Others	0.32	0.6
Seaplane Tenders	Chitose-class	1.12	2.1
	Akitsushima	1.6	3
Light Aircraft Carriers	Houshou	0.96	1.8
	Ryuuhou	1.12	2.1
	Shouhou-class Ryuujou	1.28	2.4
	Chitose-class Carrier Hiyou-class	1.44	2.7
Aircraft Carriers	Unryuu-class	1.6	3
	Shoukaku-class	2.08	3.9
	Hiryuu Souryuu	2.24	4.2
	Akagi	2.4	4.5
	Kaga	2.56	4.8
	Taihou	2.88	5.4
Submarine Tenders	Taigei	1.12	2.1
Amphibious Assault Ships	Akitsumaru	1.44	2.7
Repair Ships	Akashi	1.7	3.3
Training Cruisers	Katori	1.12	2.1
Collaboration Ships	SS Iona	4.8	9
	CA Takao	5.6	10.5
	BB Haruna	6.4	12
Type	Class

Full list of rounded ship class cost: Wikiwiki

Examples

Example 1: Level 67 Kongou Kai with 41/75 HP (34 damage):

• Base repair time:
  • [math]\displaystyle{ 67 \times 5 + floor(\sqrt {67 - 11}) \times 10 + 50 = 335 + 7 \times 10 + 50 = \text {455 seconds} }[/math]
• Repair time:
  • [math]\displaystyle{ 34 \times \text{455 seconds} \times 1.5 + \text{30 seconds} = \text{23235 seconds or 6:27:15} }[/math]
• Resource costs:
  • [math]\displaystyle{ floor(90 \times 34 \times 0.06) = \text{183 steel} }[/math]
  • [math]\displaystyle{ floor(90 \times 34 \times 0.032) = \text{97 fuel} }[/math]

Example 2: Level 150 Musashi Kai with 1/106 HP (105 damage):

• Base repair time:
  • [math]\displaystyle{ 150 \times 5 + floor(\sqrt {150 - 11}) \times 10 + 50 = 750 + 11 \times 10 + 50 = \text {910 seconds} }[/math]
• Repair time:
  • [math]\displaystyle{ 105 \times \text{910 seconds} \times 2.0 + \text{30 seconds} = \text{191130 seconds or 53:05:30} }[/math]
• Resource costs:
  • [math]\displaystyle{ floor(250 \times 105 \times 0.06) = \text{1575 steel} }[/math]
  • [math]\displaystyle{ floor(250 \times 105 \times 0.032) = \text{840 fuel} }[/math]
• This is the highest in the game currently.

Notes

Bucket icon

• While a ship is being repaired in the docks:
  • You cannot cancel that repair (you must wait the full duration or use an Instant Repair to vacate that dock slot)
  • You cannot modify equipments, modernize the ship, or remodel the ship.
• If a ship ends repair with 39 morale or less, it will be set to 40. This includes repairs ended by using Instant Repair.
• You can shave off the last minute of repair time by switching to the docking screen when a ship has less than one minute of repair time to go.
• You start the game with two repair dock slots—you can pay money (DMM points) to buy keys in the shop and expand to 3 or 4 slots. (The key is also used to unlock construction dock slots.)
• To use buckets to instantly finish repairs use the green button (shown to the right) or activate the slider on the repair confirmation window.