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Improvement

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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 Improved+1 to Max-Improved (+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 Improved+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 Improved to the upgraded equipment.
  8. Certain conversion quests like F62, F89, F70, and F107, allow to use Improved equipment, but any Improved 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 Reference Charts.

The improvement effects are unknown for:

Square Rooted Bonus

Most bonuses 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 Fighter Power LoS Accuracy Evasion CI rates
Firepower Torpedo Ship Fleet Shelling Torpedo Shelling Torpedo Fleet Enemy
Main Guns (Very) Large
Large Caliber Main Gun
1.5 - 1 - - - - - 1 - - - - -
Medium (Red)
Medium Caliber Main Gun
1 - 1 - - - - - 1 - - - - -
Small (Red)
Small Caliber Main Gun
1 - 1 - - - - - 1 - - - - -
HA (Green)
Main High-Angle GunMain
1 - 1 - 2[1]
3[2]
2[1]
3[2]
- - 1 - - - - -
Secondary Guns 90 mm Single HA90mm Single High-angle Gun Mount
Secondary High-Angle GunSec
1 - 1 - - - 1 - - - - -
HA (Green)
Secondary High-Angle GunSec
Linear 0.2[3]
Linear 0.3[4]
- Linear 0.2[3]
Linear 0.3[4]
- - - 1 - - - - -
Surface (Yellow)
Secondary Gun
- - - - - - 1 - - - - -
15.2 cm Single15.2cm Single Gun Mount & OTOOTO 152mm Triple Rapid Fire Gun Mount
Secondary Gun
1 - 1 - - - - - 1 - - - - -
Anti-Aircraft Fire Directors
Anti-Aircraft Fire Director
1 - 1 - 2[1]
3[2]
2[1]
3[2]
- - 1 - - - - -
Anti-Air Guns
Anti-Aircraft Gun
1 1.2 - - 4[1]
6[2]
- - - - 2 - - - -
Torpedoes
Torpedoes
- 1.2 1 - - - - - - 2 - - - -
Midget Submarines
Midget SubmarineMinisub
- - 1 - - - - - - - - - - -
Carrier Recons
Reconnaissance Aircraft
- - - - - - - 1.2 - - - - - -
Large Flying Boats
Large Flying Boat
- - - - - - - 1.2 - - - - - -
Seaplanes
Seaplane
Recons - - - - - - - 1.2 - - - - - -
Bombers - - - - - - - 1.1 - - - - - -
Liaison Aircraft
Liaison Aircraft
- - - - - - - - 1 - - - - -
Land Based Bombers Attackers/Assault/Heavy Bombers
Land Based Attack AircraftLand Based Assault AircraftHeavy Bomber
- 0.7 - - - - 0.5 - - - - - - -
GingaGinga & Type 1 NonakaType 1 Land-based Attack Aircraft (Nonaka Squadron)
Land Based Attack Aircraft
- 0.7 - - - - Linear 0.25 - - - - - - -
Hayabusa bomberBomb-carrying Type 1 Fighter Hayabusa Model III Kai (65th Squadron)
Land-based Fighter
- - - - - - 0.5 - - - - - - -
Radars
RADAR
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
Depth Charges
0.75 - - 0.66 - - - - - - - - - -
Sonars
SONAR
0.75 - - 0.66 - - - - 1.3[5] - - 1.5 - -
Engines
Engine Improvement
- - - - - - - - - - 1.5 - -
Shells
Armor-Piercing ShellAnti-Aircraft Shell
1 - 1 - - - - - 1 - - - - -
Landing Craft & Amphibious Tank
Landing CraftAmphibious Tank
1 - 1 - - - - - - - - - - -
Anti-Ground Rockets
Anti-Ground Artillery
1 - 1 - - - - - - - - - - -
Lookouts
Lookout
1 - 1 - - - - - - - - - - -
Searchlights
Searchlight
1 - 1 - - - - - - - - - - -?%
Aviation Personnels
Aviation Personnel
1 - 1
0.7[6]
- - - - - - - - - - -
  1. 1.0 1.1 1.2 1.3 1.4 For base Anti-Air AA ≤ 7
  2. 2.0 2.1 2.2 2.3 2.4 For base Anti-Air AA ≥ 8
  3. 3.0 3.1 For base Firepower FP ≤ 3
  4. 4.0 4.1 For base Firepower FP ≥ 5
  5. Applies to ASW only.
  6. Carrier Night Air Attacks 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 Anti-Installation Bonus[1] Expedition Bonus[2]
Submarine Torpedoes
Submarine TorpedoesSub
- - 0.2 - - - -
Fighters
Fighter
0.2 - - - - - -
SPF
Seaplane Fighter
0.2 - - - - - -
LB Fighters
Land-based FighterLand-based Fighter
0.2 - - - - - -
Fighter-Bombers
Dive Bomber
0.25 - - - - - -
Dive Bombers (ex. FB)
Dive Bomber
- 0.2 - 0.2 - - -
Torpedo Bombers
Torpedo Bomber
- - 0.2 0.2 - - -
Seaplane Bombers
Seaplane
- 0.2 - - - - -
Rotorcraft
Rotorcraft
BasicKa Type Observation Autogyro
O Type Observation Autogyro Kai
- - - 0.2 - - -
AdvancedO Type Observation Autogyro Kai Ni
S-51J
S-51J Kai
- - - 0.3 - - -
Liaison Aircraft
Liaison Aircraft
- - - 0.2 - - -
Extra Armor
Armor
Medium - - - - 0.2 - -
Large - - - - 0.3 - -
Landing Craft
Landing Craft
- - - - - 0.02% 0.05%[3]
0.02%[4]
0%[5]
Amphibious Tanks
Amphibious Tank
- - - - - 0.03% 0.01%

See Also

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