Introduction

Improvements are upgrades to equipment that increase their performance or upgrade them to better versions. Akashi is required to improve equipment. Improvements are done in Akashi's Improvement Arsenal. Improvement Materials are needed for all improvements except Battle Ration improvements.

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

Overview

Improvement levels are displayed beside equipment names.
- They run from ★+1 to ★MAX (+10).
Improvement bonuses are hidden. The increase in stats are not reflected on the stat cards of ship girls.
- This means they do not affect Support Expeditions or hitting OASW thresholds.
- Exceptions are equipment such as the Type 2 Recon Aircraft and 61cm Quad (Oxygen) Torpedo Mount Late Model that give additional visible fit bonuses to certain ship girls when improved.
Equipped equipment cannot be improved.
- There is an option to unequip the equipment from the improvement list.
Equipment must be unlocked in order to be upgraded to a better version.
Improvements have a chance to fail. Please see below for details.
- Materials and any fodder equipment are still lost on failure.
- You will not lose the actual equipment being improved.
- It is highly recommended you use the guarateed 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.
Improved equipment cannot be used as fodder.
Certain conversion quests like F15 and F29 that do not require ★MAX equipment will carry over any improvements to the upgraded equipment.
- This is currently the only way to obtain improved versions of the unimprovable Reppuu (601 Air Group).

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 you obtain her to maximise your improvement success rates. The data below is sourced from KanColle Kai. Note that the browser version has a small chance of failure even when the listed rate is 100%.

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

For calculated improvment bonuses, please refer to the Reference Charts.

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 modifer for that stat. Please refer to the table below for details.

Equipment Type		Day Battle		Night Battle	ASW	Anti-Air		Line of Sight	Accuracy		Evasion
Equipment Type		Firepower	Torpedo	Night Battle	ASW	Equipment AA	Fleet AA	Line of Sight	Shelling	Torpedo	Shelling	Torpedo
Main Guns	Small Caliber (Red)	1	-	1	-	-	-	-	1	-	-	-
	Small Caliber High-Angle (Green)	1	-	1	-	0.7	3	-	1	-	-	-
	Medium Caliber	1	-	1	-	-	-	-	1	-	-	-
	Large Caliber	1.5	-	1	-	-	-	-	1	-	-	-
Secondary Guns	Normal (Yellow)	1	-	1	-	-	-	-	1	-	-	-
Secondary Guns	High-Angle (Green)	Linear 0.2	-	Linear 0.2	-	0.7	3	-	1	-	-	-
Anti-Air Guns		1	1.2	-	-	0.7	-	-	-	2	-	-
Anti-Aircraft Fire Director		1	-	1	-	0.7	2	-	1	-	-	-
Torpedoes		0	1.2	1	-	-	-	-	-	2	-	-
Carrier-Based Reconnaisance		-	-	-	-	-	-	1.2	-	-	-	-
Seaplanes (Reconnaissance & Bomber)		-	-	-	-	-	-	1.2	-	-	-	-
RADAR	LOS^[1]	-	-	-	-	-	-	1.25	1.7	-	-	-
RADAR	Anti-Air^[2]	-	-	-	-	-	1.5	1.25	1	-	-	-
Depth Charges		0.75	-	-	0.66	-	-	-	-	-	-	-
SONARs		0.75	-	-	0.66	-	-	-	1.3^[3]	-	-	1.5
Engines		-	-	-	-	-	-	-	-	-	-	1.5
Shells		1	-	1	-	-	-	-	-	1	-	-
Landing Craft		1	-	1	-	-	-	-	-	-	-	-
Searchlight		1	-	1	-	-	-	-	-	-	-	-
Anti-Ground Rocket		1	-	1	-	-	-	-	-	-	-	-

↑ With LoS greater than 5.
↑ With Anti-Air stat.
↑ Applies to ASW only.

Linear Bonus

Bonuses to fighter power, dive bomb, plane torpedo, plane ASW, armour, 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]
Carrier-based Planes	Fighter	0.2	-	-	-	-	-	-
	Fighter-Bomber	0.2	-	-	-	-	-	-
	Torpedo Bomber	-	-	0.2	0.2	-	-	-
Land-Based Fighter/Interceptor		0.2	-	-	-	-	-	-
Bulge	Medium	-	-	-	-	0.2	-	-
Bulge	Large	-	-	-	-	0.3	-	-
Seaplane Bombers		-	0.2	-	-	-	-	-
Auto-gyro	Basic^[3]	-	-	-	0.2	-	-	-
Auto-gyro	Advanced^[4]	-	-	-	0.3	-	-	-
Landing Craft	Daihatsu	-	-	-	-	-	0.02%	0.05%^[5] 0.02%^[6]
Landing Craft	Amphibious Tank	-	-	-	-	-	0.03%	0.01%