Conversion History
What Is SWG
SWG stands for Standard Wire Gauge. It is a traditional gauge system used to identify wire and metal diameter. A SWG number corresponds to a specific wire diameter, which can be expressed in millimeters for metric measurements.
What Is SWG to MM Conversion
SWG to MM conversion changes a Standard Wire Gauge size into its equivalent diameter in millimeters. This is useful when a specification is given in SWG but the measurement or component drawing uses metric units.
SWG to MM Formula
For standard SWG sizes from 0 through 36, the diameter can be calculated using the standard gauge relationship.
The formula gives the nominal wire diameter in millimeters. For practical work, the standard SWG reference table is normally used for the exact nominal size.
How to Convert SWG to MM
- Enter the SWG number in the first field.
- The calculator finds the corresponding nominal diameter.
- The result is displayed in millimeters.
20 SWG = 0.914 mm nominal diameter.
Common SWG to MM Conversions
| SWG | Diameter in MM |
|---|---|
| 0 | 8.230 mm |
| 1 | 7.620 mm |
| 2 | 7.010 mm |
| 4 | 6.046 mm |
| 6 | 4.877 mm |
| 8 | 4.064 mm |
| 10 | 3.251 mm |
| 12 | 2.642 mm |
| 14 | 2.032 mm |
| 16 | 1.626 mm |
| 18 | 1.219 mm |
| 20 | 0.914 mm |
| 22 | 0.711 mm |
| 24 | 0.559 mm |
| 26 | 0.457 mm |
| 28 | 0.376 mm |
| 30 | 0.315 mm |
| 32 | 0.274 mm |
| 34 | 0.234 mm |
| 36 | 0.193 mm |
Examples of SWG to MM Conversion
10 SWG is approximately 3.251 mm in diameter.
16 SWG is approximately 1.626 mm in diameter.
20 SWG is approximately 0.914 mm in diameter.
24 SWG is approximately 0.559 mm in diameter.
Why Convert SWG to MM
- Checking wire and sheet metal specifications
- Comparing gauge and metric measurements
- Reading engineering drawings and product specifications
- Selecting wire sizes for practical applications
- Comparing supplier specifications
How to Use This SWG to MM Converter
Enter a SWG number in the first field. The calculator immediately displays the equivalent diameter in millimeters. You can also enter a millimeter diameter to find the corresponding SWG size.
The quick-select buttons provide commonly used SWG sizes. Save History stores recent conversions in your browser, while the PDF option creates a simple conversion report.
Frequently Asked Questions
SWG stands for Standard Wire Gauge. It is a gauge system used to specify wire and metal diameter.
20 SWG is approximately 0.914 mm in nominal diameter.
10 SWG is approximately 3.251 mm in nominal diameter.
16 SWG is approximately 1.626 mm in nominal diameter.
24 SWG is approximately 0.559 mm in nominal diameter.
Yes. Enter the diameter in millimeters and the calculator estimates the closest standard SWG size.
Yes. In the SWG system, a higher gauge number generally represents a smaller diameter.
Final Thoughts
SWG to MM conversion makes it easier to compare traditional gauge sizes with metric diameter measurements. Use the converter above for quick two-way conversion and common SWG reference values.