# Wire gauge chart

There are many different wire gauge designations. AWG = American Wire Gauge, SWG = Imperial Standard Wire Gauge - (British legal standard), B&S = Brown & Sharpe, International standard wire sizes (IEC 60228) etc.

**In the American Wire Gauge(AWG)**, diameters can be calculated by applying the formula

D(AWG)=0.005·92^{((36-AWG)/39)} (inch).

For the 00, 000, 0000 etc. gauges is using: -1, -2, -3. This means that in American wire gage every 6 gauge decrease gives a doubling of the wire diameter area, and every 3 gauge decrease doubles the wire cross sectional area. Just like "dB" in signal levels!

**In the Metric Gauge scale**, the gauge is 10 times the diameter in millimeters, so a 50 gauge metric wire would be 5 mm in diameter.