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The cross-sectional area of each gauge is an important factor for determining its current-carrying capacity and resistance. The AWG of a stranded wire is determined by the total cross-sectional area of the conductor. Because there are also small gaps between the strands, a stranded wire will be about 5% thicker than a solid wire with the same AWG.
== AWG/Metric wire size equivalents and ampacities ==
In Europe, wire size is expressed as the number of strands and cross sectional area in mm<sup>2</sup>. For example. 7/0.2 means 7 strands of wire each 0.2mm diameter. In America the AWG numbering scheme is applied not only to individual strands but also to equivalent size bunches of smaller strands. For example. 24 AWG could be made of 1 strand of 24 AWG wire (1/24) or 7 strands of 32 AWG wire (7/32). Standard metric wire sizes do not correspond exactly to American wire sizes. The table below provides approximations of the closest equivalents for the wires most commonly found in the audio industry. The rated ampacities are just rule of thumb.<ref name="canford">[http://www.canford.co.uk/Technical/Article/MetricAWGWireSizeEquivalents Metric/AWG wire size equivalents]</ref><ref>[https://www.powerstream.com/Wire_Size.htm Wire gauge and current limits including skin depth and strength], PowerStream Technology</ref>
{|class="wikitable" border="1"
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!AWG!!Conductor ø (mm)!!AWG stranding!!Metric stranding!!Max A for wiring!!Maximum A for power
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| 32||0.20||1/32, 7/40, 19/44||1/0.2, 7/0.08||0.53||0.091
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| 30||0.25||1/30, 7/38, 19/42||1/0.25, 7/0.1||0.86||0.142
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| 28||0.32||1/28, 7/36, 19/40||1/0.315, 7/0.125||1.4||0.226
|-
| 26||0.40||1/26, 7/34, 19/38||1/0.4, 7/0.15, 19/0.1||2.2||0.361
|-
| 25||0.46||1/25||14/0.12||2.7||0.457
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| 24||0.53||1/24, 7/32, 19/36||1/0.5, '''7/0.2''', 19/0.12, 30/0.1||3.5||0.577
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| 23||0.56||1/23||14/0.15, 32/0.1||4.7||0.729
|-
| 22||0.64||1/22, 7/30, 19/34||'''1/0.6''', 7/0.25, 19/0.15, 30/0.12||7||0.92
|-
| 21||0.72||14/36||13/0.2, 55/0.1||9||1.2
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| 20||0.81||1/20, 7/28, 19/32||'''16/0.2''', 44/0.12||11||1.5
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| 18||0.98||1/18, 19/30, 33/32||19/0.25, '''24/0.2''', 96/0.1||16||2.3
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| 16||1.30||7/24, 19/29||19/0.3||22||3.7
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| 14||1.63||19/27, 73/32||28/0.3||32||5.9
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| 13||1.78||35/28||50/0.25, 140/0.15||35||7.4
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| 11||2.26||||56/0.3, 512/0.1||47||12
|}
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