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 Improvement material 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.
  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.

The  Minisub Midget Submarines 
 
 
and   Rations 
 
 
are the only equipment that do not gain any stats from improvement.

  • Improving them only serves to upgrade them into their improved versions.
  • Since improving a Combat Ration  up to +6★ cost 0 screw, it is possible to farm some screw by upgrading a ration once a day while doing quest F18.

 Submarine Radars 
 
 
 
do not get any stat from improvement, but improving them with increase relevant Cut-In trigger rates.

Square Rooted Bonus

Bonuses to attack power (day shelling, night shelling, torpedo, ASW), anti-air, LoS, accuracy, and evasion are all a function of the square root of the improvement level. The bonus can be calculated by:

[math]\displaystyle{ \text{Bonus}_\text{stat} = \sum_{\text{All equips}} \text{Mod}_\text{equip} \sqrt{\bigstar} }[/math]

  • [math]\displaystyle{ \bigstar }[/math] is the improvement level of the equipment.
  • [math]\displaystyle{ \text{Mod}_\text{equip} }[/math] is the equipment modifier for that stat. Please refer to the table below for details.
Equipment Type Day Battle Night Battle ASW AA LoS Accuracy Evasion
Firepower Torpedo Equipment AA Fleet AA Shelling Torpedo Shelling Torpedo
Main Guns Small Guns (Red)
 
1 - 1 - - - - 1 - - -
Main High-Angle Guns (Green)
 
1 - 1 - 0.7 2[1]
3[2]
- 1 - - -
Medium Guns (Red)
 
1 - 1 - - - - 1 - - -
Large Guns
 
1.5 - 1 - - - - 1 - - -
Secondary Guns Surface (Yellow)
 
Linear 0.3 - Linear 0.3 - - - - 1 - - -
15.2 cm Single  & OTO 
 
1 - 1 - - - - 1 - - -
High-Angle (Green)
 
Linear 0.2 - Linear 0.2 - 0.7 3 - 1 - - -
90 mm Single HA 
 
1 - 1 - 0.7 3 - 1 - - -
5" Twin Secondary CD [3]
 
Linear 0.3 - Linear 0.3 - 0.7? 3? - 1? - - -
Anti-Air Guns
 
1 1.2 - - 0.7 - - - 2 - -
Anti-Aircraft Fire Directors
 
1 - 1 - 0.7 2 - 1 - - -
Torpedoess
 
0 1.2 1 - - - - - 2 - -
Carrier Recons
 
- - - - - - 1.2 - - - -
Seaplanes
 
Reconnaissance - - - - - - 1.2 - - - -
Bomber - - - - - - 1.1 - - - -
Land Based Bombers Attackers/Assault 
 
/Heavy Bombers 
 

   
- - - 0.7 0.5 - - - - - -
Ginga  & Type 1 Nonaka 
 
- - - 0.7 Linear 0.25 - - - - - -
Hayabusa bomber 
 
- - - - 0.5 - - - - - -
Radars
 
Surface Large - - - - - - 1.4 1.7 - - -
Small - - - - - - 1.25 - - -
Dual Purpose Large & Very Large - - - - - 1.5 1.4 - - -
Small - - - - - 1.25 1 - - -
Air Radar Large - - - - - 1.4 - - -
Small - - - - - 1.25 - - -
Depth Charges
 
0.75 - - 0.66 - - - - - - -
Sonars
 
0.75 - - 0.66 - - - 1.3[4] - - 1.5
Engines
 
- - - - - - - - - - 1.5
Shells
  
1 - 1 - - - - - 1 - -
Landing Crafts & Amphibious Tank
  
1 - 1 - - - - - - - -
Searchlights
 
1 - 1 - - - - - - - -
Anti-Ground Artillery
 
1 - 1 - - - - - - - -
  1. For guns with AA ≤ 6
  2. For guns with AA ≥ 7
  3. https://twitter.com/hedgehog_hasira/status/1548329561636495373
  4. Applies to ASW only.

Linear Bonus

Bonuses to fighter power, dive bomb, plane torpedo, plane ASW, armor, anti-installation bonus, and expedition bonus just have a linear growth. The bonus per improvement level is given by the table below.

Equipment Type Fighter Power Dive Bomb Torpedo ASW Armour Anti-Installation Bonus[1] Expedition Bonus[2]
Submarine Torpedoes
 
- - 0.2 - - - -
Carrier-based Planes Fighters/SPF
  
0.2 - - - - - -
Fighter-Bombers
 
0.25 - - - - - -
Dive Bombers (ex. FB)
 
- 0.2 - 0.2 - - -
Torpedo Bombers
 
- - 0.2 0.2 - - -
Interceptors
  
0.2 - - - - - -
Armor
 
Medium - - - - 0.2 - -
Large - - - - 0.3 - -
Seaplane Bombers
 
- 0.2 - - - - -
Rotorcrafts
 
Basic[3] - - - 0.2 - - -
Advanced[4] - - - 0.3 - - -
Landing Crafts
 
- - - - - 0.02% 0.05%[5]


0.02%[6]

Amphibious Tanks
 
- - - - - 0.03% 0.01%

See Also

Akashi's Improvement Arsenal
Improvement/Reference Charts
https://akashi-list.me/