What is Impact Factor
Impact factor is a measure of the
frequency with which the "average article" published in a given
scholarly journal has been cited in a particular year or period and is often
used to measure or describe the importance of a particular journal to its
field. The Thomson-Reuters (formerly Institute for Scientific Information
(ISI)) ranks, evaluates, and compares journals within subject categories and
publishes the results in Journal Citation Reports. The new
rankings come out in the Spring, for the previous year's journals. Three
years worth of data are required to calculate a Journal Impact Factor.
The formula to determine the 2007
impact factor for a journal would be calculated as follows:
A = the number of times articles
published in the journal during 2006-7 were cited by other journals during 2008
B = the number of articles or reviews that were published in the journal during 2006-7
B = the number of articles or reviews that were published in the journal during 2006-7
2007 Impact factor for a journal =
A/B
list of impact factor journals
eg for 2013 Indo American Journal of Pharmaceutical Research 0.85 www.iajpr.com (Pharma)
Journal Names
|
2006 cited
|
Impact Factor
|
Immed. Index
|
Articles
|
Half-life
|
CELL ONCOL
|
2391
|
3.089
|
0.5
|
62
|
8.2
|
CELL PHYSIOL BIOCHEM
|
148
|
2.979
|
0.357
|
14
|
2.1
|
CELL PROLIFERAT
|
1115
|
3.558
|
0.206
|
63
|
3.8
|
CELL RES
|
912
|
4.492
|
0.356
|
45
|
3.9
|
CELL SIGNAL
|
1157
|
3.426
|
0.545
|
101
|
2.4
|
CELL STRESS CHAPERON
|
4590
|
4.887
|
1.213
|
225
|
4.1
|
CELL STRUCT FUNCT
|
1195
|
3.097
|
0.25
|
40
|
5.1
|
CELL TISSUE RES
|
1120
|
2.143
|
1.5
|
4
|
6.8
|
EXP HEAT TRANSFER
|
2441
|
1.112
|
0.235
|
153
|
6.8
|
EXP MOL MED
|
157
|
0.361
|
0.1
|
20
|
8.5
|
EXP NEUROL
|
965
|
2.296
|
0.265
|
83
|
3.6
|
EXP TECHNIQUES
|
13008
|
4.156
|
0.889
|
316
|
6.9
|
EXP THERM FLUID SCI
|
162
|
0.274
|
0.133
|
45
|
5.4
|
EXP THERM FLUID SCI
|
1178
|
0.894
|
0.075
|
80
|
6.9
|
EXPERT OPIN BIOL TH
|
1178
|
0.894
|
0.075
|
80
|
6.9
|
EXPERT REV MED DEVIC
|
1405
|
2.705
|
0.385
|
104
|
2.8
|
EXPERT REV PROTEOMIC
|
81
|
0.791
|
0.141
|
64
|
|
EXPERT SYST APPL
|
350
|
2.991
|
0.581
|
31
|
1.8
|
EXTREMOPHILES
|
884
|
0.957
|
0.123
|
162
|
4.4
|
FARADAY DISCUSS
|
999
|
1.921
|
0.164
|
67
|
5.1
|
FASEB J
|
4045
|
4.731
|
2.766
|
47
|
99.9
|
FATIGUE FRACT ENG M
|
30621
|
6.721
|
1.241
|
449
|
5.8
|
FEBS J
|
1387
|
0.756
|
0.097
|
93
|
7.7
|
FEBS LETT
|
1879
|
3.033
|
0.463
|
467
|
1.4
|
FEMS IMMUNOL MED MIC
|
53127
|
3.372
|
0.589
|
1068
|
7.7
|
FEMS MICROBIOL ECOL
|
2626
|
2.281
|
0.34
|
156
|
5.2
|
FEMS MICROBIOL LETT
|
4812
|
3.157
|
0.489
|
186
|
5.3
|
FEMS MICROBIOL REV
|
13243
|
2.068
|
0.344
|
485
|
6.7
|
IEE P-ELECT POW APPL
|
1127
|
0.927
|
0.047
|
85
|
7.2
|
IEE P-GENER TRANSM D
|
609
|
0.29
|
0.036
|
110
|
8.3
|
IEE P-MICROW ANTEN P
|
819
|
0.293
|
0.011
|
91
|
8.3
|
IEE P-OPTOELECTRON
|
686
|
0.572
|
0.033
|
91
|
9
|
IEE P-SCI MEAS TECH
|
544
|
0.632
|
0.035
|
57
|
8
|
IEE P-VIS IMAGE SIGN
|
476
|
0.461
|
0.081
|
37
|
99.9
|
IEE REV
|
382
|
0.461
|
0.04
|
101
|
6.2
|
IEEE ACM T COMPUT BI
|
57
|
0.126
|
0
|
17
|
|
IEEE ACM T NETWORK
|
121
|
2.283
|
0.389
|
36
|
2.2
|
IEEE AERO EL SYS MAG
|
3614
|
1.789
|
0.131
|
107
|
7.4
|
IEEE ANTENN PROPAG M
|
172
|
0.423
|
0
|
78
|
4.4
|
IEEE CIRCUITS DEVICE
|
847
|
0.873
|
0.169
|
59
|
6.2
|
IEEE COMMUN MAG
|
241
|
1.22
|
0.067
|
15
|
5.7
|
IEEE ELECTR DEVICE L
|
3691
|
1.678
|
0.224
|
165
|
5.2
|
IEEE ELECTR INSUL M
|
5233
|
2.716
|
0.5
|
278
|
4.9
|
IEEE ENG MED BIOL
|
199
|
0.612
|
0
|
22
|
6.4
|
IEEE IND APPL MAG
|
1095
|
0.94
|
0.067
|
60
|
6.8
|
IEEE INSTRU MEAS MAG
|
181
|
0.238
|
0.023
|
43
|
5.5
|
IEEE INTELL SYST
|
127
|
0.327
|
0.051
|
39
|
4.9
|
IEEE J OCEANIC ENG
|
1120
|
2.413
|
0.176
|
68
|
5.1
|
IEEE J QUANTUM ELECT
|
1106
|
1.259
|
0.391
|
46
|
6.7
|
IEEE J QUANTUM ELECT
|
10005
|
2.262
|
0.48
|
150
|
99.9
|
IEEE J SEL AREA COMM
|
10005
|
2.262
|
0.48
|
150
|
99.9
|
IEEE J SEL TOP QUANT
|
6813
|
1.816
|
0.209
|
235
|
6.9
|
IEEE J SOLID-ST CIRC
|
4712
|
2.842
|
0.191
|
188
|
5.3
|
IEEE MICROW MAG
|
7148
|
2.002
|
0.234
|
290
|
6.8
|
IEEE MICROW WIREL CO
|
210
|
1.357
|
0.167
|
30
|
4
|
IEEE NETWORK
|
1428
|
1.424
|
0.159
|
226
|
3
|
IEEE PERVAS COMPUT
|
1135
|
2.211
|
0.057
|
35
|
6.2
|
IEEE PHOTONIC TECH L
|
447
|
2.062
|
0.093
|
43
|
3.5
|
IEEE PHOTONIC TECH L
|
13528
|
2.353
|
0.461
|
868
|
4.5
|
IEEE SENS J
|
13528
|
2.353
|
0.461
|
868
|
4.5
|
IEEE SENS J
|
834
|
1.117
|
0.135
|
223
|
3.3
|
IEEE SIGNAL PROC LET
|
834
|
1.117
|
0.135
|
223
|
3.3
|
IEEE SIGNAL PROC MAG
|
1367
|
0.722
|
0.039
|
181
|
5.1
|
IEEE SPECTRUM
|
1466
|
2.655
|
1.212
|
52
|
5.4
|
IEEE T ADV PACKAGING
|
728
|
0.84
|
0.279
|
61
|
6.5
|
IEEE T AERO ELEC SYS
|
763
|
1.443
|
0.106
|
94
|
4.8
|
IEEE T ANTENN PROPAG
|
2316
|
0.836
|
0.233
|
86
|
99.9
|
IEEE T APPL SUPERCON
|
9487
|
1.48
|
0.245
|
477
|
9.9
|
IEEE T APPL SUPERCON
|
3096
|
0.717
|
1.654
|
26
|
4
|
IEEE T AUDIO SPEECH
|
3096
|
0.717
|
1.654
|
26
|
4
|
IEEE T AUTOMAT CONTR
|
29
|
0.136
|
198
|
|
|
IEEE T BIO-MED ENG
|
15573
|
2.772
|
0.156
|
256
|
99.9
|
IEEE T BROADCAST
|
7328
|
2.302
|
0.233
|
309
|
8.6
|
IEEE T CIRC SYST VID
|
514
|
1.235
|
0.304
|
69
|
4.1
|
IEEE T CIRCUITS-I
|
3406
|
1.743
|
0.146
|
144
|
5.7
|
IEEE T CIRCUITS-II
|
3751
|
1.139
|
0.103
|
263
|
6.1
|
IEEE T COMMUN
|
1773
|
0.922
|
0.059
|
287
|
7.1
|
IEEE T COMPON PACK T
|
8270
|
1.208
|
0.147
|
258
|
9.2
|
IEEE T COMPUT
|
1070
|
0.816
|
0.055
|
109
|
5.9
|
IEEE T COMPUT AID D
|
5518
|
1.426
|
0.243
|
140
|
99.9
|
IEEE T CONSUM ELECTR
|
2357
|
0.838
|
0.077
|
234
|
8
|
IEEE T CONTR SYST T
|
1184
|
0.727
|
0.081
|
211
|
5.2
|
IEEE T DEVICE MAT RE
|
1580
|
1.211
|
0.148
|
115
|
6
|
IEEE T DEVICE MAT RE
|
309
|
1.373
|
0.068
|
73
|
2.4
|
IEEE T DIELECT EL IN
|
309
|
1.373
|
0.068
|
73
|
2.4
|
IEEE T DIELECT EL IN
|
1228
|
0.771
|
0.087
|
160
|
6.3
|
IEEE T EDUC
|
1228
|
0.771
|
0.087
|
160
|
6.3
|
IEEE T ELECTROMAGN C
|
393
|
0.362
|
0.019
|
54
|
6.8
|
IEEE T ELECTRON DEV
|
968
|
0.77
|
0.173
|
98
|
8.5
|
IEEE T ELECTRON DEV
|
10251
|
2.052
|
0.34
|
423
|
7.7
|
IEEE T ELECTRON PACK
|
10251
|
2.052
|
0.34
|
423
|
7.7
|
IEEE T ENERGY CONVER
|
311
|
1
|
0.111
|
36
|
4.7
|
IEEE T ENG MANAGE
|
1246
|
0.716
|
0.066
|
106
|
7.6
|
IEEE T FUZZY SYST
|
800
|
0.825
|
0.22
|
41
|
9.2
|
IEEE T GEOSCI REMOTE
|
2579
|
1.803
|
0.085
|
71
|
6.9
|
IEEE T IMAGE PROCESS
|
7698
|
1.752
|
1.055
|
343
|
6.7
|
IEEE T IND APPL
|
7045
|
2.715
|
0.307
|
322
|
6.7
|
IEEE T IND ELECTRON
|
3663
|
0.611
|
0.068
|
161
|
9.5
|
IEEE T IND INFORM
|
2175
|
0.59
|
0.05
|
200
|
6.9
|
IEEE T INFORM THEORY
|
36
|
0.923
|
0.4
|
30
|
|
IEEE T INSTRUM MEAS
|
14149
|
1.938
|
0.398
|
452
|
8.8
|
IEEE T INTELL TRANSP
|
2461
|
0.572
|
0.074
|
299
|
7.6
|
IEEE T KNOWL DATA EN
|
327
|
1.434
|
0.163
|
49
|
4
|
IEEE T MAGN
|
2125
|
2.063
|
0.159
|
126
|
5.5
|
IEEE T MAGN
|
10422
|
0.938
|
0.151
|
910
|
7.3
|
IEEE T MED IMAGING
|
10422
|
0.938
|
0.151
|
910
|
7.3
|
IEEE T MICROW THEORY
|
7766
|
3.757
|
0.532
|
141
|
6.7
|
IEEE T NANOBIOSCI
|
10815
|
2.027
|
0.265
|
529
|
7.8
|
IEEE T NANOTECHNOL
|
316
|
2.592
|
0.162
|
37
|
2.7
|
IEEE T NANOTECHNOL
|
713
|
1.909
|
0.207
|
111
|
3
|
IEEE T NEUR SYS REH
|
713
|
1.909
|
0.207
|
111
|
3
|
IEEE T NEURAL NETWOR
|
627
|
1.842
|
0.221
|
68
|
3.4
|
IEEE T NUCL SCI
|
6167
|
2.62
|
0.28
|
150
|
7.5
|
IEEE T PARALL DISTR
|
8582
|
1.497
|
0.2
|
606
|
6.8
|
IEEE T PATTERN ANAL
|
1669
|
1.246
|
0.112
|
116
|
6.9
|
IEEE T PLASMA SCI
|
14708
|
4.306
|
0.489
|
182
|
9.2
|
IEEE T POWER DELIVER
|
3821
|
1.144
|
0.179
|
329
|
6.5
|
IEEE T POWER ELECTR
|
2692
|
0.496
|
0.066
|
274
|
9
|
IEEE T POWER SYST
|
2169
|
1.029
|
0.049
|
204
|
7
|
IEEE T RELIAB
|
4094
|
0.922
|
0.066
|
228
|
8.2
|
IEEE T SEMICONDUCT M
|
1297
|
0.8
|
0.033
|
61
|
99.9
|
IEEE T SEMICONDUCT M
|
852
|
0.785
|
0.115
|
52
|
7.2
|
IEEE T SIGNAL PROCES
|
852
|
0.785
|
0.115
|
52
|
7.2
|
IEEE T SOFTWARE ENG
|
8390
|
1.57
|
0.203
|
434
|
7.5
|
IEEE T SPEECH AUDI P
|
3203
|
2.132
|
0.158
|
57
|
99.9
|
IEEE T ULTRASON FERR
|
1687
|
1.006
|
0
|
6.6
|
|
IEEE T VEH TECHNOL
|
4384
|
1.729
|
0.245
|
261
|
6.9
|
IEEE T VLSI SYST
|
2783
|
1.071
|
0.103
|
174
|
7.7
|
IEEE T WIREL COMMUN
|
1027
|
0.771
|
0.052
|
134
|
5.6
|
IEEE TECHNOL SOC MAG
|
1383
|
1.184
|
0.077
|
427
|
2.9
|
IEEE WIREL COMMUN
|
53
|
0.512
|
0.05
|
20
|
|
IEEE-ASME T MECH
|
574
|
2.577
|
0.05
|
60
|
3.1
|
IEICE T COMMUN
|
798
|
0.979
|
0.074
|
81
|
5.3
|
IEICE T ELECTRON
|
1046
|
0.29
|
0.041
|
489
|
4.3
|
IEICE T FUND ELECTR
|
1102
|
0.508
|
0.05
|
298
|
4.6
|
IETE J RES
|
1132
|
0.312
|
0.049
|
508
|
4.8
|
IETE TECH REV
|
19
|
0.05
|
0
|
25
|
|
IIE TRANS
|
26
|
0.023
|
0
|
12
|
|
IMAGE VISION COMPUT
|
1839
|
0.637
|
0.058
|
86
|
99.9
|
IMMUNITY
|
1770
|
1.171
|
0.093
|
118
|
6.4
|
IMMUNOBIOLOGY
|
22744
|
18.306
|
3.556
|
133
|
5.8
|
IMMUNOGENETICS
|
1401
|
1.867
|
0.24
|
75
|
7.1
|
IMMUNOL ALLERGY CLIN
|
3896
|
2.852
|
0.491
|
106
|
6.7
|
IMMUNOL CELL BIOL
|
487
|
3.178
|
0.163
|
43
|
3.1
|
IMMUNOL INVEST
|
1827
|
2.482
|
0.567
|
67
|
5.5
|
IMMUNOL LETT
|
490
|
1.276
|
0
|
26
|
8.9
|
IMMUNOL RES
|
3336
|
2.352
|
0.529
|
157
|
4.7
|
IMMUNOL REV
|
1115
|
2.342
|
0.035
|
57
|
5.3
|
IMMUNOLOGY
|
8489
|
10.758
|
1.508
|
118
|
5
|
IMMUNOPHARM IMMUNOT
|
7992
|
3.674
|
0.52
|
175
|
8
|
IN VITRO CELL DEV-AN
|
461
|
0.654
|
0.107
|
56
|
7
|
IN VITRO CELL DEV-PL
|
1102
|
0.735
|
0.04
|
50
|
7.5
|
IND ENG CHEM RES
|
734
|
0.607
|
0
|
80
|
5.5
|
IND LUBR TRIBOL
|
16523
|
1.518
|
0.258
|
1067
|
6.4
|
IND ROBOT
|
74
|
0.444
|
0.25
|
32
|
|
INDIAN J BIOCHEM BIO
|
111
|
0.278
|
0.045
|
44
|
4.7
|
INDIAN J CHEM A
|
486
|
0.277
|
0.055
|
55
|
99.9
|
INDIAN J CHEM B
|
2092
|
0.631
|
0.168
|
167
|
9.8
|
INDIAN J CHEM TECHN
|
2660
|
0.491
|
0.049
|
283
|
99.9
|
INDIAN J CHEM TECHN
|
313
|
0.301
|
0.021
|
95
|
6.3
|
INDIAN J ENG MATER S
|
313
|
0.301
|
0.021
|
95
|
6.3
|
INDIAN J HETEROCY CH
|
123
|
0.277
|
0.028
|
72
|
4
|
INDIAN J MED RES
|
385
|
0.254
|
0.046
|
130
|
5.8
|
INDIAN J PHYS
|
1621
|
1.224
|
0.342
|
117
|
99.9
|
INDIAN J PURE AP PHY
|
425
|
0.195
|
0.024
|
124
|
9.4
|
INDOOR AIR
|
809
|
0.38
|
0.045
|
154
|
99.9
|
INDO AMERICAN JOURNAL OF
PHARMACEUTICAL RESEARCH
|
1100
|
0.85
|
0.5
|
102
|
5.1
|
INFECT DIS CLIN N AM
|
198
|
0.535
|
0.2
|
65
|
3.6
|
INFECT IMMUN
|
1453
|
1.642
|
0.091
|
44
|
7
|
INFIN DIMENS ANAL QU
|
47906
|
4.004
|
0.645
|
819
|
7
|
INFLAMM RES
|
520
|
0.634
|
0.079
|
38
|
9.7
|
INFLAMMATION
|
2032
|
1.485
|
0.109
|
119
|
5.9
|
INFORM MIDEM
|
844
|
0.761
|
0
|
9.6
|
|
INFRARED PHYS TECHN
|
23
|
0.066
|
0
|
22
|
|
ING HIDRAUL MEX
|
793
|
0.97
|
0.186
|
70
|
8.2
|
ING QUIM
|
58
|
0.225
|
0.049
|
41
|
|
INORG CHEM
|
39
|
0.125
|
0.053
|
19
|
|
INORG CHEM COMMUN
|
58002
|
3.911
|
0.699
|
1443
|
8.4
|
INORG CHIM ACTA
|
3248
|
1.787
|
0.29
|
335
|
3.5
|
INORG REACT MECH
|
12777
|
1.674
|
0.433
|
631
|
7.9
|
INSECT BIOCHEM MOLEC
|
130
|
0.8
|
0.125
|
16
|
6.2
|
INSECT MOL BIOL
|
3746
|
2.711
|
0.464
|
97
|
6.3
|
INSTRUM EXP TECH+
|
1850
|
2.639
|
0.463
|
82
|
5.4
|
INSTRUM SCI TECHNOL
|
621
|
0.329
|
0.086
|
140
|
8
|
INT ARCH ALLERGY IMM
|
202
|
0.518
|
0.037
|
54
|
4.6
|
INT BIODETER BIODEGR
|
4497
|
2.524
|
0.269
|
145
|
7.2
|
INT GAS ENG MANAGE
|
1217
|
1.619
|
0.092
|
76
|
6.5
|
INT IMMUNOL
|
7
|
0.029
|
0
|
46
|
|
ISA T
|
8
|
0.064
|
0
|
44
|
|
ISOKINET EXERC SCI
|
217
|
0.3
|
0.062
|
48
|
6.5
|
ISOT ENVIRON HEALT S
|
132
|
0.222
|
0
|
30
|
6.9
|
ISR J CHEM
|
240
|
0.952
|
0.226
|
31
|
4.4
|
ISR J ZOOL
|
1093
|
1.174
|
0.125
|
24
|
99.9
|
ISSUES SCI TECHNOL
|
318
|
0.4
|
|
99.9
|
|
ITAL J ZOOL
|
167
|
0.43
|
0.179
|
28
|
5.6
|
ITE J
|
353
|
0.857
|
0.068
|
44
|
6.2
|
IUBMB LIFE
|
129
|
0.132
|
0.021
|
47
|
8.6
|
J ADHES SCI TECHNOL
|
1460
|
2.316
|
0.253
|
83
|
4.6
|
J ADHESION
|
1343
|
0.868
|
0.068
|
117
|
7.5
|
J ADV OXID TECHNOL
|
935
|
1.046
|
0.113
|
53
|
99.9
|
J ADV TRANSPORT
|
185
|
0.85
|
0.054
|
37
|
7.4
|
J AEROSOL SCI
|
102
|
0.731
|
0
|
16
|
7.8
|
J AEROSPACE ENG
|
4040
|
2.952
|
0.272
|
125
|
8.4
|
J AGR BIOL ENVIR ST
|
151
|
0.478
|
0.037
|
27
|
6.9
|
J AGR FOOD CHEM
|
328
|
0.85
|
0
|
18
|
6.4
|
J AIR WASTE MANAGE
|
37636
|
2.322
|
0.341
|
1459
|
6
|
J AIRCRAFT
|
3106
|
1.441
|
0.286
|
161
|
6.9
|
J ALLERGY CLIN IMMUN
|
1658
|
0.456
|
0.066
|
243
|
9.5
|
J ALLOY COMPD
|
26391
|
8.829
|
1.79
|
338
|
5.4
|
J ALZHEIMERS DIS
|
13994
|
1.25
|
0.204
|
1217
|
5.3
|
J AM ASSOC LAB ANIM
|
974
|
3.058
|
0.532
|
62
|
3.2
|
J AM CHEM SOC
|
8
|
0.093
|
75
|
|
|
J VAC SCI TECHNOL B
|
7388
|
1.394
|
0.199
|
366
|
8.6
|
J VAC SCI TECHNOL B
|
10633
|
1.597
|
0.268
|
589
|
6.7
|
J VESTIBUL RES-EQUIL
|
10633
|
1.597
|
0.268
|
589
|
6.7
|
J VIB ACOUST
|
604
|
1.057
|
0
|
7
|
8.8
|