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# Improvement

(Redirected from Improvement Material)
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Ship Equipment
Marriage · Morale and Fatigue · Gifting · Supply
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Development · Improvement · Fit Bonuses
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Stats · Resources · Experience and Rank · Ranking

Improvements are upgrades to equipment that increase their performance or upgrade them to better versions. Improvements are done in Akashi's Improvement Arsenal, requiring Akashi. Improvement Materials are notably used for improvements.

• For a comprehensive list of improvements, please refer to Akashi-List or the List of Improvements.

# Overview

1. Improvement levels are displayed beside equipment names.
• They run from +1 to (+10).
2. Improvement bonuses are hidden. The increase in stats is not reflected on ship girls' stat cards.
• This means they do not count for Support Expeditions or for reaching certain thresholds like for OASW.
• Those bonuses work to some extent to reach regular Expeditions thresholds.
• Some improvements on equipment can add some additional visible Fit Bonuses.
3. Equipped equipment cannot be improved.
• There is an option to unequip the equipment from the improvement list.
4. Equipment must be unlocked in order to be upgraded to a better version.
5. Improvements have a chance to fail. Please see below.
• Materials and any fodder equipment are still lost on failure.
• The equipment being improved is never lost.
• It is recommended to use the guaranteed improvement toggle when dealing with expensive improvements and/or rare fodder at +6 and beyond.
• Akashi Kai has a higher success rate than her base version.
6. Improved equipment cannot be used as fodder.
7. Certain conversion quests like F13, F14, F15, F19, F22, and F24 to F30, that do not require improved equipment, will carry over any to the upgraded equipment.
• This is currently the only way to obtain improved versions of the , & (unimprovable otherwise).
8. Certain conversion quests like F62, F89, F70, and F107, allow to use Improved equipment, but any are lost during conversion.

# Improvement Success Rates

Akashi's level does not affect improvement rates. However, her remodel status does. It is highly recommended that she be remodeled to Kai as soon as possible, to maximize improvement success rates. The data below is sourced from KanColle Kai.

Modification Level 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★ Upgrade
Akashi 100% 100% 100% 100% 95% 90% 80% 77% 72% 60% 50%
Akashi Kai 100% 100% 100% 100% 100% 95% 90% 82% 77% 67% 62%

# Improvement Bonuses

The bonus stats gained from improvement will vary depending on the type of equipment as well as the stat itself.

• Most improved stats will come as decimal numbers due to the use as base decimals and how square roots work.
• It is important to note that decimals must not be discarded in favor of whole numbers, as stats will be multiplied by various formulas anyway, to finally be rounded down/up.
• For calculated improvment bonuses, please refer to the Categories Charts or Reference Charts.

The improvement effects are unknown for:

• LB .
• Air power and LoS might be affected, but it is unknown due to how LBAS work.
• Submarine Equipment.
• .
• It is confirmed that it is none of the usual stats.
• Morale gains might be affected. So far, improvement serves to upgrade them into their improved versions.
• Since improving a up to +6★ cost 0 screw, it is possible to farm some screw by upgrading a ration once a day while doing quest F18.
• Army Units (unmaped yet)

### Square Rooted Bonus

Most bonuses are all a function of the square root of the improvement level. The bonus can be calculated by:

$\displaystyle{ \text{Bonus}_\text{stat} = \sum_{\text{All equips}} \text{Mod}_\text{equip} \sqrt{\bigstar} }$

• $\displaystyle{ \bigstar }$ is the improvement level of the equipment.
• $\displaystyle{ \text{Mod}_\text{equip} }$ is the equipment modifier for that stat. Please refer to the table below for details.
Equipment Type Day Battle Night Battle ASW AA Fighter Power LoS Accuracy Evasion
Firepower Torpedo Ship Fleet Shelling Torpedo Shelling Torpedo
Main Guns (Very) Large
1.5 - 1 - - - - - 1 - - -
Medium (Red)
1 - 1 - - - - - 1 - - -
Small (Red)
1 - 1 - - - - - 1 - - -
HA (Green)
Main
1 - 1 - 2[1]
3[2]
2[1]
3[2]
- - 1 - - -
Secondary Guns
Sec
1 - 1 - - - 1 - - -
HA (Green)
Sec
Linear 0.2[3]
Linear 0.3[4]
- Linear 0.2[3]
Linear 0.3[4]
- - - 1 - - -
Surface (Yellow)
- - - - - - 1 - - -
&
1 - 1 - - - - - 1 - - -
Anti-Aircraft Fire Directors
1 - 1 - 2[1]
3[2]
2[1]
3[2]
- - 1 - - -
Anti-Air Guns
1 1.2 - - 4[1]
6[2]
- - - - 2 - -
Torpedoes
- 1.2 1 - - - - - - 2 - -
Midget Submarines
Minisub
- - 1 - - - - - - - - -
(Large) Carrier Recons
- - - - - - - 1.2 - - - -
Large Flying Boats
- - - - - - - 1.2 - - - -
Seaplanes
Recons - - - - - - - 1.2 - - - -
Bombers - - - - - - - 1.1 - - - -
Liaison Aircraft
- - - - - - - - 1 - - -
Land Based Bombers Attackers/Assault/Heavy Bombers
- 0.7 - - - - 0.5 - - - - -
&
- 0.7 - - - - Linear 0.25 - - - - -

- - - - - - 0.5 - - - - -
Surface Large - - - - - - - 1.4 1.7 - - -
Small - - - - - - - 1.25 - - -
Dual Purpose (Very) Large - - - - - 1.5 - 1.4 - - -
Small - - - - - - 1.25 1 - - -
Air Radar Large - - - - - - 1.4 - - -
Small - - - - - - 1.25 - - -
Depth Charges[5]
0.75 - - 0.67 - - - - - - - -
Depth Charge Racks
DCR
- - - - - - - - - - -
Sonars
0.75 - - 0.67 - - - - 1.3[6] - - 1.5
Engine Improvements
- - - - - - - - - - 1.5
Shells
1 - 1 - - - - - 1 - - -
Landing Craft & Amphibious Tanks
1 - 1 - - - - - - - -
Anti-Ground Rockets
1 - 1 - - - - - - - - -
Lookouts
1 - 1 - - - - - - - - -
Searchlights
1 - 1 - - - - - - - - -
Aviation Personnels
1 - 1 - - - - - - - - -
Command Facilities
1 - 1 - - - - - - - - -
Combat Rations
- - - - - - - - - - - -
1. For base AA ≤ 7
2. For base AA ≥ 8
3. For base FP ≤ 3
4. For base FP ≥ 5
5. Hedgehog (Initial Model) is not counted as a DCR here [1]
6. Applies to ASW only.

### Linear Bonus

Some bonuses have a linear growth. The bonus per improvement level is given in the table below.

Equipment Type Fighter Power Dive Bomb Torpedo ASW Armor
Submarine Torpedoes
Sub
- - 0.2 - -
Fighters
0.2 - - - -
Seaplane Fighters
- - - -
LB Fighters
- - - -
Fighter-Bombers
0.25 - - - -

- - 0.2 -
Dive Bombers (ex. FB)
- 0.2 - -
Torpedo Bombers
- - 0.2 -
Seaplane Bombers
- 0.2 - - -
Rotorcraft
- - - 0.2[1]
0.3[2]
-
Liaison Aircraft
[3]
- - - 0.2[4]
0.3[5]
-
Extra Armor
Medium - - - - 0.2
Large - - - - 0.3
1. For base ASW ≤ 10
2. For base ASW ≥ 11
3. For base ASW ≤ 7
4. For base ASW ≥ 8

### Linear % Bonus

Equipment Type Anti-Installation Bonus[1] Expedition Bonus[2]
Landing Craft
0.02%[3] 0.05%[4]
0.02%[5]
0%[6]
Amphibious Tanks
0.03% 0.01%
1. See Anti-Installation for more details.
2. See Expedition for more details
3. Some equipment have additional properties over that.
4. For other Landing Craft.