Wire Gauge Measurements

Wire Gauge Measurements

Wire Gauge Measurements are common to the USA and can be confusing if you are used to working in millimetres

Here are a list of gauge sizes with their approximate diameter in millimetres

This is intended for guidance only - the measurements are approximate and should be used as such.

The golden rule to remember is the higher the number of the wire Gauge, the thinner the wire will be - hence 28 gauge is much thinner that 14 gauge.

28 Gauge = 0.321mm
27 Gauge = 0.361mm
26 Gauge = 0.404mm
25 Gauge = 0.455mm
24 Gauge = 0.511mm
23 Gauge = 0.574mm
22 Gauge = 0.643mm
21 Gauge = 0.724mm
20 Gauge = 0.813mm
19 Gauge = 0.912mm
18 Gauge = 1.02mm

I buy my wire -in the most part, from a UK Manufacturer - and will liken each product to its smallest gauge for the sizing - for example, I have 0.3mm and am not aware if it is 0.321 or 0.361mm, and so would liken that to 28 Gauge - the sizing for 0.321mm width.

Therefore, using my system :
0.3mm = 28 gauge
0.4mm = 26 gauge
0.5mm = 24 gauge
0.6mm = 22 gauge
0.7mm = 21 gauge
0.8mm = 20 gauge
0.9mm = 19 gauge
1.0mm = 18 gauge.