Coil Calculator
Inductance Calculator

presented by
"Stay Tuned "
Crystal Radio Web site



Enter "Number of Turns", "Dia. of Coil Form", and "Wire Dia." (from chart below) and press "Calculate"
     Number 
of Turns
  Dia. of Coil 
(inches)
Wire Dia.
(See Chart *)
(inches)



Inductance (uH)

Enamled Wire Chart

Wire Gauge
Dia. in Inches
12
.1055
14
.0800
16
.0625
18
.0475
20
.0345
22
.0286
24
.0222
26
.0179
28
.0143
30
.0105

Covered Wire Chart

 
California Fine Wire INSULATION DIMENSION CHART FOR X, 2X, 3X, AND 4x INSULATION California Fine Wire
AWG
Bare wire diameter
Single
Heavy
Triple
Quadruple
Size
Min
Nom
Max
Min

Inc.

Max

O. D.

Min

Inc.

Max

O. D.

Min

Inc.

Max

O. D.

Min

Inc.

Max

O. D.

14
.0635
.0641
.0644
.0016
.0666
.0032
.0682
.0048
.0700
.0064
.0715
15
.0565
.0571
.0574
.0015
.0594
.0030
.0609
.0045
.0627
.0060
.0644
16
.0503
.0508
.0511
.0014
.0531
.0029
.0545
.0043
.0562
.0057
.0577
17
.0448
.0453
.0455
.0014
.0475
.0028
.0488
.0041
.0504
.0055
.0520
18
.0399
.0403
.0405
.0013
.0424
.0026
.0437
.0039
.0452
.0052
.0468
19
.0355
.0359
.0361
.0012
.0379
.0025
.0391
.0037
.0406
.0049
.0422
20
.0317
.0320
.0322
.0012
.0339
.0023
.0351
.0035
.0364
.0047
.0379
21
.0282
.0285
.0286
.0011
.0303
.0022
.0314
.0033
.0326
.0044
.0342
22
.0250
.0253
.0254
.0011
.0270
.0021
.0281
.0032
.0293
.0043
.0308
23
.0224
.0226
.0227
.0010
.0243
.0020
.0253
.0030
.0264
.004
.0279
24
.0199
.0201
.0202
.0010
.0217
.0019
.0227
.0029
.0238
.0039
.0252
25
.0177
.0179
.0180
.0009
.0194
.0018
.0203
.0027
.0214
.0036
.0228
26
.0157
.0159
.0160
.0009
.0173
.0017
.0182
.0026
.0193
.0035
.0206
27
.0141
.0142
.0143
.0008
.0156
.0016
.0164
.0024
.0173
.0032
.0185
28
.0125
.0126
.0127
.0008
.0140
.0016
.0147
.0023
.0156
.0031
.0166
29
.0112
.0113
.0114
.0007
.0126
.0015
.0133
.0022
.0142
.0029
.0152
30
.0099
.0100
.0101
.0007
.0112
.0014
.0119
.0021
.0128
.0028
.0137
31
.0088
.0089
.0090
.0006
.0100
.0013
.0108
.0019
.0114
.0026
.0121
32
.0079
.0080
.0081
.0006
.0091
.0012
.0098
.0018
.0104
.0024
.0110
33
.0070
.0071
.0072
.0005
.0081
.0011
.0088
.0016
.0093
.0022
.0099
34
.0062
.0063
.0064
.0005
.0072
.0010
.0078
.0015
.0083
.0020
.0088
35
.0055
.0056
.0057
.0004
.0064
.0009
.0064
.0013
.0074
.0018
.0079
36
.0049
.0050
.0051
.0004
.0058
.0008
.0063
.0012
.0067
.0016
.0071
37
.0044
.0045
.0046
.0003
.0052
.0008
.0057
.0012
.0061
.0016
.0065
38
.0039
.0040
.0041
.0003
.0047
.0007
.0051
.0010
.0054
.0014
.0058
39
.0034
.0035
.0036
.0002
.0041
.0006
.0045
.0009
.0048
.0012
.0051
40
.0030
.0031
.0032
.0002
.0037
.0006
.0040
.0009
.0043
.0012
.0046
41
.0027
.0028
.0029
.0002
.0033
.0005
.0036
.0007
.0038
.0010
.0041
42
.0024
.0025
.0026
.0002
.0030
.0004
.0032
.0006
.0034
.0008
.0036
43
.0021
.0022
.0023
.0002
.0026
.0004
.0029
.0006
.0031
.0008
.0033
44
.0019
.0020
.0021
.0001
.0024
.0004
.0027
.0006
.0029
.0008
.0031
45
.00169
.00176
.0018
.0001
.00205
.0003
.0023
.0005 .0025 .0007 .0032
46
.00151
.00157
.0016
.0001
.00185
.0003
.0021
.0005 .0023 .0007 .0030
47
.00135
.0014
.0015
.0001
.0017
.0003
.0019
.0004 .0021 .0006 .0028
48
.00119
.00124
.0013
.0001
.0015
.0002
.0017
.0004 .0019 .0006 .0028
49
.00107
.00111
.0012
.0001
.0013
.0002
.0015
.0003 .0017 .0005 .0025
50
.00095
.00099
.00103
.0001
.0012
.0002
.0014
.0003 .0015 .0005 .0023
51
.00085
.00088
.00092
.0001
.0011
.0002
.00129
.0003 .0014 .0005 .0021
52
.00075
.00078
.00081
.0001
.0010
.0002
.00115
.0003 .0013 .0005 .0019
53
.00067
.00070
.00073
.00005
.00085
.00013
.00103
.0003 .0012 .0005 .0017
54
.00060
.00062
.00065
.00005
.00075
.00013
.00095
.0003 .00115 .0005 .0015
55
.00053
.00055
.00057
.00005
.00070
.00013
.00087
.0003 .00107 .0005 .0013
56
.00047
.00049
.00051
.00005
.00065
.00013
.00081
.0003 .00101 .0005 .0012



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