SWG to mm Calculator

Use this Standard Wire Gauge (SWG) to millimeter (mm) calculatorfor converting between two different systems of measuring wire thickness.

This conversion helps professionals and hobbyists in various fields, including electrical engineering, jewelry making, and metalworking, to quickly and accurately convert SWG measurements to their equivalent millimeter values.

SWG	mm
4	5.89
6	4.88
8	4.06
10	3.25
14	2.03
20	0.914
23	0.610

4 SWG to mm 4 SWG is equivalent to 5.89 mm
6 SWG to mm 6 SWG is equivalent to 4.88 mm
8 SWG to mm 8 SWG is equivalent to 4.06 mm
10 SWG to mm 10 SWG is equivalent to 3.25 mm
14 SWG to mm 14 SWG is equivalent to 2.03 mm
20 SWG to mm 20 SWG is equivalent to 0.914 mm
23 SWG to mm 23 SWG is equivalent to 0.610 mm

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SWG to mm conversion Formula

The conversion from SWG to mm uses the following formula:

mm ≈ 0.3048 × (50 – SWG) / 16

The SWG system, primarily used in the United Kingdom and some Commonwealth countries, assigns numbers to wire diameters.

In contrast, the metric system uses millimeters for precise measurements.

An SWG to mm converter bridges this gap, allowing for seamless conversion between these two measurement standards.

What is SWG thickness?

SWG thickness refers to the diameter of a wire or sheet metal as measured using the Standard Wire Gauge system.

This system was established in the 19th century and has been widely used in the UK and other countries for specifying the thickness of wires, metal sheets, and other materials.

In the SWG system, thickness is denoted by a number, typically ranging from 0 to 36, with some gauges extending to 50 or higher for extremely thin wires.

The lower the SWG number, the thicker the wire or sheet. For example:

SWG 0 corresponds to a thickness of about 0.324 inches (8.23 mm)
SWG 36 corresponds to a thickness of about 0.005 inches (0.13 mm)

SWG thickness measurements are commonly used in various industries, including:

Electrical wiring: For determining the current-carrying capacity of wires
Jewelry making: To specify the thickness of metal wires and sheets
Sheet metal work: In construction and manufacturing
Musical instrument strings: Particularly for stringed instruments

What is 1.65 mm in SWG?

1.65 mm is approximately equivalent to 16 SWG

15 SWG = 1.83 mm
16 SWG = 1.63 mm

As we can see, 16 SWG (1.63 mm) is the closest match to 1.65 mm, with only a 0.02 mm difference. This small variance is often acceptable in many practical applications.

SWG to mm Calculator – Convert SWG to mm