# SWG to mm conversion and calculator: Gauge Size Conversion

Standard wire gauge (SWG) to mm and mm2 converison calculator, chart and how to convert.

## SWG to mm conversion calculator

 Select gauge #: -- select SWG -- 7/0 6/0 5/0 4/0 3/0 2/0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Diameter in millimeters: mm Diameter in inches: in Cross sectional area in square millimeters: mm2

## Wire cross sectional area calculation and Chart

The n gauge wire's cross sercional area An in square millimeters (mm2) is equal to pi divided by 4 times the square wire diameter d in millimeters (mm):

An (mm2) = (π/4)×dn2

## What is SWG

British Standard Wire Gauge is a unit for denoting wire size given by BS 3737:1964. It is also known as the Imperial Wire Gauge or British Standard Gauge. Use of SWG sizes has fallen greatly in popularity, but is still used as a measure of thickness in guitar strings and some electrical wire.

## SWG to mm conversion chart

SWG # Diameter
(mm)
Area
(mm2)
7/0 12.700 126.6769
6/0 11.786 109.0921
5/0 10.973 94.5638
4/0 10.160 81.0732
3/0 9.449 70.1202
2/0 8.839 61.3643
0 8.230 53.1921
1 7.620 45.6037
2 7.010 38.5989
3 6.401 32.1780
4 5.893 27.2730
5 5.385 22.7735
6 4.877 18.6793
7 4.470 15.6958
8 4.064 12.9717
9 3.658 10.5071
10 3.251 8.3019
11 2.946 6.8183
12 2.642 5.4805
13 2.337 4.2888
14 2.032 3.2429
15 1.829 2.6268
16 1.626 2.0755
17 1.422 1.5890
18 1.219 1.1675
19 1.016 0.8107
20 0.914 0.6567
21 0.813 0.5189
22 0.711 0.3973
23 0.610 0.2919
24 0.559 0.2452
25 0.5080 0.2027
26 0.4572 0.1642
27 0.4166 0.1363
28 0.3759 0.1110
29 0.3454 0.0937
30 0.3150 0.0779
31 0.2946 0.0682
32 0.2743 0.0591
33 0.2540 0.0507
34 0.2337 0.0429
35 0.2134 0.0358
36 0.1930 0.0293
37 0.1727 0.0234
38 0.1524 0.0182
39 0.1321 0.0137
40 0.1219 0.0117
41 0.1118 0.0098
42 0.1016 0.0081
43 0.0914 0.0066
44 0.0813 0.0052
45 0.0711 0.0040
46 0.0610 0.0029
47 0.0508 0.0020
48 0.0406 0.0013
49 0.0305 0.0007
50 0.0254 0.0005

Converting between SWG and gauge size can be confusing. This complete guide to SWG conversion charts and gauge size calculators will make conversions easy. Learn everything you need to convert wire gauges and sheet metal thicknesses.

Standard wire gauge (SWG) is a British imperial standard for wire used extensively in the UK and British Commonwealth countries. It is not commonly used in the US, which has adopted the American Wire Gauge (AWG) system. Converting between the two systems is necessary when working with materials from different countries.

This guide covers everything you need to know about SWG sizes, SWG to metric conversions, SWG conversion charts, and using SWG conversion calculators to convert gauge sizes. Read on to learn how to easily convert SWG, gauge numbers, inches, and metric measurements.

## Why Learn SWG Size Conversion? [importance, imperial, international, standards]

Understanding SWG conversion is important for working with wire and sheet metal from British suppliers. The SWG system may be unfamiliar to those used to the AWG standard.

Learning the SWG system allows you to:

• Accurately order and understand British metal specifications
• Convert imperial SWG to metric and US standard sizes
• Compare wire and sheet metal gauges across international standards

With the help of this guide and conversion tools, SWG sizes are easy to understand and convert to any system.

## Overview of the SWG Gauge System [swg, explained, imperial]

The Standard Wire Gauge system dates back to the 19th century and is based on imperial units. SWG uses gauge numbers to specify wire diameters and sheet metal thicknesses.

• SWG gauge sizes range from 0000 (4.572mm) down to 40 (0.076mm)
• As the gauge number increases, the diameter or thickness decreases
• Common SWG sizes for wire are 4, 6, 8, and 10 gauge
• Popular sheet metal SWG sizes include 22, 24, and 26 gauge

While obsolete in the US, SWG remains in use for wire and sheet metal in the UK and British commonwealth countries. It is important to understand when sourcing materials from British suppliers.

## Converting SWG Gauge to Inches [swg, inch, imperial, formula]

SWG gauge sizes can easily be converted to inches using a simple formula:

Diameter (in) = 0.005 * 92 raised to the power of (36 - SWG#)

For example, to find the inch size of 22 gauge SWG:

Diameter = 0.005 * 92 ^ (36 - 22) = 0.029 inches

Here are some common SWG gauge sizes converted to inch diameters:

• 4 SWG = 0.204 in
• 10 SWG = 0.128 in
• 16 SWG = 0.064 in
• 22 SWG = 0.029 in
• 28 SWG = 0.016 in

Using the SWG to inch formula makes converting gauge numbers to imperial diameters simple.

## Converting SWG to Millimeters [metric, formula, mm]

Many specifications now use metric sizes rather than imperial inches. Converting SWG to millimeters is straightforward:

Diameter (mm) = (92 ^ (36 - SWG#)) / (92 * 39.37)

Let's convert 26 gauge SWG to millimeters:

Diameter = (92 ^ (36 - 26)) / (92 * 39.37) = 0.455 mm

Some common SWG sizes in millimeters are:

• 4 SWG = 5.189 mm
• 10 SWG = 3.251 mm
• 16 SWG = 1.626 mm
• 22 SWG = 0.711 mm
• 28 SWG = 0.394 mm

The SWG to mm formula makes converting to metric wire diameters and sheet thicknesses easy.

## SWG Conversion Chart [chart, table, reference]

The easiest way to convert between SWG, inches, and mm is using an online SWG gauge converter tool like the one on this page.

Online converters allow you to:

• Instantly convert between SWG, inch, and mm sizes
• Convert fractions of an inch to SWG
• Find the SWG size for any millimeter measurement
• Display a conversion table for reference

Our free SWG and gauge conversion calculator makes conversions easy.

Simply enter the size and select the units to convert. The tool displays the equivalent gauge sizes in all units.

Online conversion calculators provide effortless SWG conversions anytime.

## Converting Sheet Metal Thickness [sheet, steel, aluminum]

The SWG gauge system is commonly used to specify sheet metal thickness for steel, aluminum, and other metals.

The same SWG conversion formula and tools can be used to convert sheet metal thickness. For example:

• 24 gauge steel is 0.020 inches or 0.508mm
• 1.2 mm aluminium is approximately 25 SWG
• 18 gauge mild steel sheet is 0.048 inches

Make sure to check metal thickness tolerances, which vary by material and gauge.

But overall, SWG sheet metal conversion is straightforward using the techniques in this guide.

## Summary: Key Takeaways for SWG Conversions

• Standard Wire Gauge (SWG) is an imperial measurement system used for wire and sheet metal
• SWG uses a gauge number to specify diameter and thickness
• Convert SWG to inches using the formula: Diameter(in) = 0.005 * 92 ^ (36 - SWG#)
• Convert SWG to mm using: Diameter(mm) = (92 ^ (36 - SWG#)) / (92 * 39.37)
• Use a conversion chart or online calculator for quick SWG size conversion
• The same SWG system applies to both wire diameters and sheet metal thickness

Understanding the SWG system and metric/imperial conversion allows you to work with British metal specifications confidently. This guide provides all the key information needed for accurate SWG conversions.

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