Improvement/Categories

The effect given by improvements for every equipment categories.

• Note that those categories do not perfectly match in-game equipment categories (eg. Dive Bombers & Fighter-Bombers).

The improvement effects are unknown for:

• LB Land-Based Recons.
• Submarine Equipment.
• Command Facilities
  
  .
• Rations
  
  .

(Very) Large Guns

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.50	2.12	2.59	3.00	3.35	3.67	3.96	4.24	4.50	4.74
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

Medium (Red) Guns

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

Small (Red) Guns

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

HA Green Main (7- AA)

Improvement effects
Main	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
[math]\displaystyle{ \text{AdjAA}_\text{ship} }[/math]	2.00	2.82	3.46	4.00	4.47	4.89	5.29	5.65	6.00	6.32
[math]\displaystyle{ \text{AdjAA}_\text{fleet} }[/math]	2.00	2.82	3.46	4.00	4.47	4.89	5.29	5.65	6.00	6.32
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

HA Green Main (8+ AA)

Improvement effects
Main	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
[math]\displaystyle{ \text{AdjAA}_\text{ship} }[/math]	3.00	4.24	5.19	6.00	6.70	7.34	7.93	8.48	9.00	9.48
[math]\displaystyle{ \text{AdjAA}_\text{fleet} }[/math]	3.00	4.24	5.19	6.00	6.70	7.34	7.93	8.48	9.00	9.48
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

90mm Single High-angle Gun Mount

Improvement effects
Sec	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
[math]\displaystyle{ \text{AdjAA}_\text{ship} }[/math]	3.00	4.24	5.19	6.00	6.70	7.34	7.93	8.48	9.00	9.48
[math]\displaystyle{ \text{AdjAA}_\text{fleet} }[/math]	3.00	4.24	5.19	6.00	6.70	7.34	7.93	8.48	9.00	9.48
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

HA Green Sec (7- AA & 4- FP)

Improvement effects
Sec	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
[math]\displaystyle{ \text{AdjAA}_\text{ship} }[/math]	2.00	2.82	3.46	4.00	4.47	4.89	5.29	5.65	6.00	6.32
[math]\displaystyle{ \text{AdjAA}_\text{fleet} }[/math]	2.00	2.82	3.46	4.00	4.47	4.89	5.29	5.65	6.00	6.32
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

HA Green Sec (8+ AA & 4- FP)

Improvement effects
Sec	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
[math]\displaystyle{ \text{AdjAA}_\text{ship} }[/math]	3.00	4.24	5.19	6.00	6.70	7.34	7.93	8.48	9.00	9.48
[math]\displaystyle{ \text{AdjAA}_\text{fleet} }[/math]	3.00	4.24	5.19	6.00	6.70	7.34	7.93	8.48	9.00	9.48
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

HA Green Sec (8+ AA & 5+ FP)

Improvement effects
Sp_Sec	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.3	0.6	0.9	1.2	1.5	1.8	2.1	2.4	2.7	3.0
	0.3	0.6	0.9	1.2	1.5	1.8	2.1	2.4	2.7	3.0
Ship	3.00	4.24	5.19	6.00	6.70	7.34	7.93	8.48	9.00	9.48
Fleet	3.00	4.24	5.19	6.00	6.70	7.34	7.93	8.48	9.00	9.48
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

Yellow Sec (4- FP)

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

Yellow Sec (5+ FP)

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.3	0.6	0.9	1.2	1.5	1.8	2.1	2.4	2.7	3.0
	0.3	0.6	0.9	1.2	1.5	1.8	2.1	2.4	2.7	3.0
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

15.2cm Single Gun Mount & OTO 152mm Triple Rapid Fire Gun Mount

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

AAFD (7- AA)

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
[math]\displaystyle{ \text{AdjAA}_\text{ship} }[/math]	2.00	2.82	3.46	4.00	4.47	4.89	5.29	5.65	6.00	6.32
[math]\displaystyle{ \text{AdjAA}_\text{fleet} }[/math]	2.00	2.82	3.46	4.00	4.47	4.89	5.29	5.65	6.00	6.32
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	1.30	1.84	2.25	2.60	2.91	3.18	3.44	3.68	3.90	4.11

AA Guns (7- AA)

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.2	1.69	2.07	2.40	2.68	2.93	3.17	3.39	3.60	3.79
Ship	4.00	5.66	6.93	8.00	8.94	9.80	10.58	11.31	12.00	12.65
Torpedo	2.00	2.82	3.46	4.00	4.47	4.89	5.29	5.65	6.00	6.32

AA Guns (8+ AA)

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.2	1.69	2.07	2.40	2.68	2.93	3.17	3.39	3.60	3.79
Ship	6.00	8.49	10.39	12.00	13.42	14.70	15.87	16.97	18.00	18.97
Torpedo	2.00	2.82	3.46	4.00	4.47	4.89	5.29	5.65	6.00	6.32

Torpedoes

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.2	1.69	2.07	2.40	2.68	2.93	3.17	3.39	3.60	3.79
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Torpedo	2.00	2.82	3.46	4.00	4.47	4.89	5.29	5.65	6.00	6.32

Minisubs

Improvement effects
Minisub	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16

(Large) Carrier Recons

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.2	1.69	2.07	2.40	2.68	2.93	3.17	3.39	3.60	3.79

Large Flying Boats

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.2	1.69	2.07	2.40	2.68	2.93	3.17	3.39	3.60	3.79

Seaplane Recons

Improvement effects
Recon	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.2	1.69	2.07	2.40	2.68	2.93	3.17	3.39	3.60	3.79

Seaplane Bombers

Improvement effects
Bomber	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
	1.2	1.69	2.07	2.40	2.68	2.93	3.17	3.39	3.60	3.79

Liaison Aircraft

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16

Land-Based Attackers

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.70	0.98	1.21	1.40	1.56	1.71	1.85	1.97	2.10	2.21
	0.50	0.70	0.86	1.00	1.11	1.22	1.32	1.41	1.50	1.58

Land-Based Assault Aircraft

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.70	0.98	1.21	1.40	1.56	1.71	1.85	1.97	2.10	2.21
	0.50	0.70	0.86	1.00	1.11	1.22	1.32	1.41	1.50	1.58

Land-Based Heavy Bombers

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.70	0.98	1.21	1.40	1.56	1.71	1.85	1.97	2.10	2.21
	0.50	0.70	0.86	1.00	1.11	1.22	1.32	1.41	1.50	1.58

Ginga & Type 1 Land-based Attack Aircraft (Nonaka Squadron)

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.70	0.98	1.21	1.40	1.56	1.71	1.85	1.97	2.10	2.21
	0.25	0.50	0.75	1.00	1.25	1.50	1.75	2.00	2.25	2.50

Bomb-carrying Type 1 Fighter Hayabusa Model III Kai (65th Squadron)

Improvement effects
bomber	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.50	0.70	0.86	1.00	1.11	1.22	1.32	1.41	1.50	1.58

Large Surface Radars

Improvement effects
Large	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.40	1.97	2.42	2.80	3.13	3.42	3.70	3.95	4.20	4.42
	1.70	2.40	2.94	3.40	3.80	4.16	4.50	4.81	5.10	5.38

Small Surface Radars

Improvement effects
Small	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.25	1.76	2.16	2.50	2.79	3.06	3.30	3.53	3.75	3.95
	1.70	2.40	2.94	3.40	3.80	4.16	4.50	4.81	5.10	5.38

(Very) Large Dual Purpose Radars

Improvement effects
Large	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
Fleet	1.50	2.12	2.59	3.00	3.35	3.67	3.96	4.24	4.50	4.74
	1.40	1.97	2.42	2.80	3.13	3.42	3.70	3.95	4.20	4.42
	1.70	2.40	2.94	3.40	3.80	4.16	4.50	4.81	5.10	5.38

Small Dual Purpose / AA Radars

Improvement effects
Small	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
Fleet	1.50	2.12	2.59	3.00	3.35	3.67	3.96	4.24	4.50	4.74
	1.25	1.76	2.16	2.50	2.79	3.06	3.30	3.53	3.75	3.95
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16

Large AA Radars

Improvement effects
Large	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
Fleet	1.50	2.12	2.59	3.00	3.35	3.67	3.96	4.24	4.50	4.74
	1.40	1.97	2.42	2.80	3.13	3.42	3.70	3.95	4.20	4.42
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16

Depth Charges

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.75	1.06	1.29	1.50	1.67	1.83	1.98	2.12	2.25	2.37
	0.67	0.94	1.15	1.33	1.49	1.63	1.76	1.89	2.00	2.11

Sonars

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.75	1.06	1.29	1.50	1.67	1.83	1.98	2.12	2.25	2.37
	0.67	0.94	1.15	1.33	1.49	1.63	1.76	1.89	2.00	2.11
	1.30	1.83	2.25	2.60	2.90	3.18	3.43	3.67	3.90	4.11

AP Shells

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16

AA Shells

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16

Anti-Ground Rockets

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16

Surface Ship Personnel

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16

Searchlights

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Enemy CI rate	-?%	-?%	-?%	-?%	-?%	-?%	-?%	-?%	-?%	-?%

Aviation Personnels

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	0.70	0.98	1.21	1.40	1.56	1.71	1.85	1.97	2.10	2.21

Amphibious Tanks

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Anti-Installation Bonus	0.03%	0.06%	0.09%	0.12%	0.15%	0.18%	0.21%	0.24%	0.27%	0.30%
Expedition Bonus	0.01%	0.02%	0.03%	0.04%	0.05%	0.06%	0.07%	0.08%	0.09%	0.10%

Transport Landing Craft

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Anti-Installation Bonus	0.02%	0.04%	0.06%	0.08%	0.10%	0.12%	0.14%	0.16%	0.18%	0.20%
Expedition Bonus	0.05%	0.10%	0.15%	0.20%	0.25%	0.30%	0.35%	0.40%	0.45%	0.50%

Daihatsu Landing Craft (Type 89 Medium Tank & Landing Force)

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Anti-Installation Bonus	0.02%	0.04%	0.06%	0.08%	0.10%	0.12%	0.14%	0.16%	0.18%	0.20%
Expedition Bonus	0.02%	0.04%	0.06%	0.08%	0.10%	0.12%	0.14%	0.16%	0.18%	0.20%

Landing Craft

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Anti-Installation Bonus	0.02%	0.04%	0.06%	0.08%	0.10%	0.12%	0.14%	0.16%	0.18%	0.20%

Submarine Torpedoes

Improvement effects
Sub	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

Fighters

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

Seaplane Fighters

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

Land-Based Fighters 1

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

Land-Based Fighters 2

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

Fighter-Bombers

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.25	0.50	0.75	1.00	1.25	1.50	1.75	2.00	2.25	2.50

Dive Bombers

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

Torpedo Bombers

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

Rotorcraft (Basic)

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

Rotorcraft (Advanced)

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.3	0.6	0.9	1.2	1.5	1.8	2.1	2.4	2.7	3.0

Medium Extra Armors

Improvement effects
Medium	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0

Large Extra Armors

Improvement effects
Large	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.3	0.6	0.9	1.2	1.5	1.8	2.1	2.4	2.7	3.0

See Also

• Improvement
• https://akashi-list.me/