Resupplying is mainly done through the Supply menu. It is important to keep your girls fully supplied as low supplies can severely hamper their combat effectiveness. Low ammo reduces damage, low fuel reduces evasion, and low plane stocks will reduce both damage and air control power.

Other methods of resupplying ship girls are detailed below.

Overview

The fleet will be unable to sortie if fuel or ammunition is empty.
Ship girls will start to incur damage penalties at <50% ammo and evasion penalties at <75% fuel.
Low supply levels will cause Expeditions to fail.
Bauxite is only consumed when there are depleted plane slots in the fleet.
For resupply costs, please refer to the individual ship girl pages. Keep in mind that costs can change for each remodel.

Resupplying

The cost of resupplying is simply:

[math]\displaystyle{ \text{Cost} = \lfloor \text{Consumption} \times \text{%Loss} \times \text{Mod}_\text{Married}\rfloor }[/math]

[math]\displaystyle{ \text{Consumption} }[/math] is the fuel or ammo consumption of the ship girl.
[math]\displaystyle{ \text{%Loss} }[/math] is the amount of fuel or ammo that needs to be resupplied, expressed as a percentage.
[math]\displaystyle{ \text{Mod}_\text{Married} }[/math] is the married Ship multiplier. It is [math]\displaystyle{ 0.85 }[/math] for married ships, otherwise [math]\displaystyle{ 1 }[/math]

Supply Menu

Supply menu screen and all its features

The resupply menu can at most resupply one fleet or a page of unused girls at a time.

Ship Girls

Resupply Fleet

To resupply the entire fleet, simply click one of the two "resupply all" buttons as described above. This will resupply the fuel, ammo, and lost planes of all the girls in the fleet.

Individual Resupply

For more control over resupply, such as when completing quest E4, girls may be resupplied individually.

Click on the check box to the left of the ship girl banner to select her.
Choose whether to resupply fuel , ammo , or both (まとめて補給).

Planes

Planes slots are usually automatically replenished when a ship girl is resupplied. However, there are some cases where a ship girl has full supplies while her planes are depleted. To replenish only planes, click the Replenish Planes (艦載機補充) button.

Resupplying Planes costs [math]\displaystyle{ 5 \times \text{N}_\text{Planes Lost} }[/math] Bauxite.
The resupply is slot dependent, so equipping any plane in a depleted slot won't resupply it.
Jets' steel consumption is not counted as a "resupply".

Expedition Menu

After clearing Quests D25 and obtaining the Provisional Resupply, it is possible to resupply the expedition fleets immediately before sending them on expeditions from the expedition menu. Simply click on the small resupply button beside the "Dispatch" button.

Sorties: Maritime Resupply

Fleet Oilers (AO) can notably refuel ships mid-sortie using Underway Replenishment.

They can also carry Landing Craft, which is useful for Resource Farming.

Supply (Mechanic)

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