Wire Gauge Size Charts: AWG (American Wire Gauge), SWG (British Standard), IEC 60228 - Equipment Ready for Use (2024)

Contents

  1. American Wire Gauge Size Chart (AWG)
  2. AWG Chart for Copper Wire (Resistance / Ampacity / Fusing Current)
  3. British Standard Wire Gauge Size Chart (SWG)
  4. Strand make-up according to DIN VDE 0295, IEC 60228

Wire gauge charts provide a reference for determining the diameter or thickness of wires, typically used in electrical and engineering applications. These charts are available for various wire gauge standards, including the American Wire Gauge (AWG), Standard Wire Gauge (SWG), and others. They display the gauge number alongside the corresponding diameter or thickness in inches or millimeters. Wire gauge charts are invaluable tools for selecting the appropriate wire size for specific purposes, ensuring compatibility and safety in electrical systems and other applications.

American Wire Gauge Size Chart (AWG)

The American Wire Gauge (AWG) is a standardized wire gauge system introduced in 1857, primarily utilized in North America to specify the diameters of round, solid, nonferrous, electrically conducting wires.

AWGDiameterTurns of wire, w/o insulationArea
(in)(mm)(per in)(per cm)(kcmil)(mm2)
0000 (4/0)0.460011.6842.170.856212107
000 (3/0)0.409610.4052.440.96116885.0
00 (2/0)0.36489.2662.741.0813367.4
0 (1/0)0.32498.2513.081.2110653.5
10.28937.3483.461.3683.742.4
20.25766.5443.881.5366.433.6
30.22945.8274.361.7252.626.7
40.20435.1894.891.9341.721.2
50.18194.6215.502.1633.116.8
60.16204.1156.172.4326.313.3
70.14433.6656.932.7320.810.5
80.12853.2647.783.0616.58.37
90.11442.9068.743.4413.16.63
100.10192.5889.813.8610.45.26
110.09072.30511.04.348.234.17
120.08082.05312.44.876.533.31
130.07201.82813.95.475.182.62
140.06411.62815.66.144.112.08
150.05711.45017.56.903.261.65
160.05081.29119.77.752.581.31
170.04531.15022.18.702.051.04
180.04031.02424.89.771.620.823
190.03590.91227.911.01.290.653
200.03200.81231.312.31.020.518
210.02850.72335.113.80.8100.410
220.02530.64439.515.50.6420.326
230.02260.57344.317.40.5090.258
240.02010.51149.719.60.4040.205
250.01790.45555.922.00.3200.162
260.01590.40562.724.70.2540.129
270.01420.36170.427.70.2020.102
280.01260.32179.131.10.1600.0810
290.01130.28688.835.00.1270.0642
300.01000.25599.739.30.1010.0509
310.008930.22711244.10.07970.0404
320.007950.20212649.50.06320.0320
330.007080.18014155.60.05010.0254
340.006300.16015962.40.03980.0201
350.005610.14317870.10.03150.0160
360.005000.12720078.70.02500.0127
370.004450.11322588.40.01980.0100
380.003970.10125299.30.01570.00797
390.003530.08972831110.01250.00632
400.003140.07993181250.009890.00501

The wire dimensions are outlined in ASTM standard B 258, with the cross-sectional area of each gauge serving as a critical determinant of its current-carrying capacity.

Wire Gauge Size Charts: AWG (American Wire Gauge), SWG (British Standard), IEC 60228 - Equipment Ready for Use (1)

AWG employs a logarithmic stepped scale, with increasing gauge numbers corresponding to logarithmically decreasing wire diameters. This logarithmic progression aligns with other non-metric gauging systems like the British Standard Wire Gauge (SWG). However, AWG differs from the metric wire-size standard, IEC 60228, prevalent in most global regions, which bases measurements directly on the wire cross-sectional area in square millimeters (mm²).

AWG Chart for Copper Wire (Resistance / Ampacity / Fusing Current)

The following table presents diverse data, encompassing the resistance of different wire gauges and the permissible current (ampacity) for copper conductors with plastic insulation. The diameter specifications provided pertain to solid wires; for stranded wires, the equivalent cross-sectional copper area is computed.

Wire Gauge Size Charts: AWG (American Wire Gauge), SWG (British Standard), IEC 60228 - Equipment Ready for Use (2)

Fusing current, indicative of the wire’s melting point, is approximated at a 25°C (77°F) ambient temperature. The table’s assumptions are based on DC currents or AC frequencies at or below 60 Hz, without factoring in the skin effect phenomenon.

AWG Copper wireLength-specific resistanceAmpacity at temperature ratingFusing current
60°C75°C90°CPreeceOnderdonk
(mΩ/m)(mΩ/ft)(A)~10 s1 s32ms
0000 (4/0)0.16080.04901952302603.2 kA33 kA182 kA
000 (3/0)0.20280.06181652002252.7 kA26 kA144 kA
00 (2/0)0.25570.07791451751952.3 kA21 kA115 kA
0 (1/0)0.32240.09821251501701.9 kA16 kA91 kA
10.40660.12391101301451.6 kA13 kA72 kA
20.51270.1563951151301.3 kA10.2 kA57 kA
30.64650.1970851001151.1 kA8.1 kA45 kA
40.81520.2485708595946 A6.4 kA36 kA
51.0280.3133795 A5.1 kA28 kA
61.2960.3951556575668 A4.0 kA23 kA
71.6340.4982561 A3.2 kA18 kA
82.0610.6282405055472 A2.5 kA14 kA
92.5990.7921396 A2.0 kA11 kA
103.2770.9989303540333 A1.6 kA8.9 kA
114.1321.260280 A1.3 kA7.1 kA
125.2111.588202530235 A1.0 kA5.6 kA
136.5712.003198 A798 A4.5 kA
148.2862.525152025166 A633 A3.5 kA
1510.453.184140 A502 A2.8 kA
1613.174.01618117 A398 A2.2 kA
1716.615.06499 A316 A1.8 kA
1820.956.38510141683 A250 A1.4 kA
1926.428.05170 A198 A1.1 kA
2033.3110.1551158.5 A158 A882 A
2142.0012.8049 A125 A700 A
2252.9616.143741 A99 A551 A
2366.7920.3635 A79 A440 A
2484.2225.672.13.529 A62 A348 A
25106.232.3724 A49 A276 A
26133.940.811.32.220 A39 A218 A
27168.951.4717 A31 A174 A
28212.964.900.831.414 A24 A137 A
29268.581.8412 A20 A110 A
30338.6103.20.520.8610 A15 A86 A
31426.9130.19 A12 A69 A
32538.3164.10.320.537 A10 A54 A
33678.8206.96 A7.7 A43 A
34856.0260.90.180.35 A6.1 A34 A
351079329.04 A4.8 A27 A
361361414.84 A3.9 A22 A
371716523.13 A3.1 A17 A
382164659.63 A2.4 A14 A
392729831.82 A1.9 A11 A
40344110491 A1.5 A8.5 A

While AWG and the Brown & Sharpe (B&S) sheet metal gauge are essentially identical, the latter was specifically designed for use with sheet metals, despite their functional interchangeability. The use of B&S terminology in reference to wire gauges is technically incorrect.

British Standard Wire Gauge Size Chart (SWG)

Below is a table listing gauge numbers alongside corresponding wire diameters. The system is based on the “thou” (or “mil” in US English), equivalent to 0.001 inches. Wire sizes are denoted as diameters in thou and tenths of a thou (mils and tenths). As gauge numbers increase, wire diameter decreases. For instance, the largest size, No. 7/0, measures 0.50 inches (500 thou or 12.7 mm) in diameter, while No. 1 is 0.30 inches (300 thou), and the smallest, No. 50, is 0.001 inches (1 thou or 25.4 µm).

Wire Gauge Size Charts: AWG (American Wire Gauge), SWG (British Standard), IEC 60228 - Equipment Ready for Use (3)

The system exhibits an approximate exponential curve when plotting diameter against gauge number, with each size being roughly a constant multiple of the preceding size. The weight per unit length decreases by an average of about 20% with each step.

SWGDiameter (in)Diameter (mm)Step
7/00.50012.7000.036″/gauge
6/00.46411.7860.032″/gauge
5/00.43210.973
4/00.40010.1600.028″/gauge
3/00.3729.4490.024″/gauge
2/00.3488.839
00.3248.230
10.3007.620
20.2767.010
30.2526.4010.020″/gauge
40.2325.893
50.2125.385
60.1924.8770.016″/gauge
70.1764.470
80.1604.064
90.1443.658
100.1283.2510.012″/gauge
110.1162.946
120.1042.642
130.0922.337
140.0802.0320.008″/gauge
150.0721.829
160.0641.626
170.0561.422
180.0481.219
190.0401.0160.004″/gauge
200.0360.914
210.0320.813
220.0280.711
230.0240.6100.002″/gauge
240.0220.559
250.0200.5080
260.0180.45720.0016″/gauge
270.01640.4166
280.01480.37590.0012″/gauge
290.01360.3454
300.01240.31500.0008″/gauge
310.01160.2946
320.01080.2743
330.01000.2540
340.00920.2337
350.00840.2134
360.00760.1930
370.00680.1727
380.00600.1524
390.00520.13210.0004″/gauge
400.00480.1219
410.00440.1118
420.0040.1016
430.00360.0914
440.00320.0813
450.00280.0711
460.00240.0610
470.00200.0508
480.00160.0406
490.00120.03050.0002″/gauge
500.00100.0254

Since weight per unit length is proportional to the cross-sectional area, which in turn is related to the square of the diameter, the diameter decreases by approximately 10.6%. However, the system is piecewise linear and only loosely approximates the exponential curve. It progresses in constant steps of 0.4 thou (0.4 mil) within the range of No. 49 to No. 39, and 0.8 thou (0.8 mil) from No. 39 to No. 30.

Comparison of AWG & IEC Wire Gauge Sizes

American Wire Gauge (AWG) and IEC 60228 (mm2) wire sizes.

AWGIEC (mm2)
300.05
280.08
260.14
240.25
220.34
210.38
200.50
180.75
171.00
161.50
142.50
124
106
810
616
425
235
150
2/070
3/095
4/0120
300 MCM150
350 MCM185
500 MCM240
600 MCM300
750 MCM400
1000 MCM500

Strand make-up according to DIN VDE 0295, IEC 60228

Cross-section in mm²Stranded WiresMulti-Stranded WiresFine WiresExtra-fine Wires
class 2 DIN VDE 0295class 5 DIN VDE 0295class 6 DIN VDE 0295
Number*** of Wires x Single Wire Ø in mmNumber of Wires x Single Wire Ø in mmNumber* of Wires** x Single Wire Ø in mmNumber* of Wires** x Single Wire Ø in mmNumber* of Wires x Single Wire Ø in mmNumber* of Wires x Single Wire Ø in mmNumber* of Wires x Single Wire Ø in mm
0.05~14 x 0.07~26 x 0.05
0.08~40 x 0.05
0.09~24 x 0.07
0.14~18 x 0.1~18 x 0.1~18 x 0.1~36 x 0.07~72 x 0.05
0.25~14 x 0.15~32 x 0.1~32 x 0.1~65 x 0.07~128 x 0.05
0.347 x 0.25~19 x 0.15~42 x 0.1~42 x 0.1~88 x 0.07~174 x 0.05
0.387 x 0.27~12 x 0.2~21 x 0.15~48 x 0.1~100 x 0.07~194 x 0.05
0.57 x 0.307 x 0.30~16 x 0.2~28 x 0.15~64 x 0.1~131 x 0.07~256 x 0.05
0.757 x 0.377 x 0.37~24 x 0.2~42 x 0.15~96 x 0.1~195 x 0.07~384 x 0.05
1.07 x 0.437 x 0.43~32 x 0.2~56 x 0.15~128 x 0.1~260 x 0.07~512 x 0.05
1.57 x 0.527 x 0.52~30 x 0.25~84 x 0.15~192 x 0.1~392 x 0.07~768 x 0.05
2.57 x 0.6719 x 0.41~50 x 0.25~140 x 0.15~320 x 0.1~651 x 0.07~1280 x 0.05
47 x 0.8519 x 0.52~56 x 0.3~224 x 0.15~512 x 0.1~1040 x 0.07
67 x 1.0519 x 0.64~84 x 0.3~192 x 0.2~768 x 0.1~1560 x 0.07
107 x 1.3549 x 0.51~80 x 0.4~320 x 0.2~1280 x 0.1~2600 x 0.07
167 x 1.7049 x 0.65~128 x 0.4~512 x 0.2~2048 x 0.1
257 x 2.1384 x 0.62~200 x 0.4~800 x 0.2~3200 x 0.1
357 x 2.52133 x 0.58~280 x 0.4~1120 x 0.2
5019 x 1.83133 x 0.69~400 x 0.4~705 x 0.3
7019 x 2.17189 x 0.69~356 x 0.5~990 x 0.3
9519 x 2.52259 x 0.69~485 x 0.5~1340 x 0.3
12037 x 2.03336 x 0.67~614 x 0.5~1690 x 0.3
15037 x 2.27392 x 0.69~765 x 0.5~2123 x 0.3
18537 x 2.52494 x 0.69~944 x 0.5~1470 x 0.4
24061 x 2.24627 x 0.70~1225 x 0.5~1905 x 0.4
30061 x 2.50790 x 0.70~1530 x 0.5~2385 x 0.4
40061 x 2.89~2035 x 0.5
50061 x 3.23~1768 x 0.6
63091 x 2.97~2228 x 0.6

* The number of individual wires are without obligation.
** The diameters of the single wires for each conductor are not allowed to exceed the values stated to DIN VDE 0295. The single wires of a stranded conductor must have all the same nominal diameters.
*** Minimum-number of single wires of stranded conductor. The single wires of a stranded conductor must have all the same nominal diameters.

Visual Comparison of AWG, SWG & IEC Wire Gauge Sizes

Below is a comparison of wire gauge sizes according to the British Standard Wire Gauge (SWG), American Wire Gauge (AWG), and International Electrotechnical Commission (IEC) 60228 standard. Note that the gauge numbers and corresponding wire diameters may vary slightly depending on the specific standard or application.

Wire Gauge Size Charts: AWG (American Wire Gauge), SWG (British Standard), IEC 60228 - Equipment Ready for Use (4)

Comparison of SWG (red), AWG (blue) and IEC 60228 (black) wire gauge sizes from 0.03 to 200 mm2 to scale on a 1 mm grid (in the SVG file, hover over a size to highlight it). SWG and AWG are commonly used in the UK and US, respectively, while IEC 60228 is an international standard.

Wire Gauge Size Charts: AWG (American Wire Gauge), SWG (British Standard), IEC 60228 - Equipment Ready for Use (2024)

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