Conversion Chart
| Gauge/Fractional Inch | Decimal Equivalent | Millimeters |
| 20g | 0.0320 | 0.81mm |
| 18g | 0.0403 | 1mm |
| 16g | 0.0508 | 1.2mm |
| 14g | 0.0641 | 1.6mm |
| 12g | 0.0808 | 2mm |
| 10g | 0.1019 | 2.5mm |
| 8g | 0.1285 | 3.2mm |
| 6g | 0.1620 | 4.1mm |
| 4g | 0.2043 | 5.1mm |
| 2g | 0.2576 | 6.5mm |
| 0g | 0.3249 | 8.2mm |
| 00g | 0.3648 | 9.2mm |
| 7/16" | 0.437 | 11.1mm |
| 1/2" | 0.500 | 12.7mm |
| 9/16" | 0.562 | 14.2mm |
| 5/8" | 0.625 | 15.8mm |
| 11/16" | 0.687 | 17.4mm |
| 3/4" | 0.750 | 19mm |