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Metalworkers Gain Key Wire Gauge Conversion Chart

February 18, 2026

For metalworkers and jewelers, the constant need to convert between Brown & Sharpe (B&S) gauge measurements, inches, and millimeters can be a persistent challenge. A single conversion error might lead to material waste, project delays, or flawed products. This comprehensive conversion chart provides an efficient solution to streamline your workflow.

Detailed B&S Gauge to Inch to Millimeter Conversion Table

The following reference table includes common wire gauge sizes with precise conversions to three decimal places, ensuring accuracy for critical measurements.

B&S Gauge Inch Millimeter (mm)
1 0.289 7.348
2 0.258 6.543
*.250 (1/4) 0.250 6.350
*.234 (15/64) 0.234 5.953
3 0.229 5.827
*.219 (7/32) 0.219 5.556
4 0.204 5.189
*.203 (13/64) 0.203 5.154
*.188 (3/16) 0.188 4.762
5 0.182 4.621
*.172 (11/64) 0.172 4.366
6 0.162 4.115
*.156 (5/32) 0.156 3.969
7 0.144 3.664
*.141 (9/64) 0.141 3.572
8 0.128 3.263
*.125 (1/8) 0.125 3.175
9 0.114 2.906
*.109 (7/64) 0.109 2.778
10 0.102 2.588
*.094 (3/32) 0.094 2.381
11 0.091 2.304
12 0.081 2.052
*.078 (5/64) 0.078 1.984
13 0.072 1.828
14 0.064 1.628
*.063 (1/16) 0.063 1.588
15 0.057 1.449
16 0.051 1.291
*.047 (3/64) 0.047 1.191
17 0.045 1.149
18 0.040 1.024
19 0.036 0.912
20 0.032 0.812
*.031 (1/32) 0.031 0.795
21 0.028 0.723
22 0.025 0.644
23 0.023 0.573
24 0.020 0.511
25 0.018 0.455
26 0.016 0.405
*.016 (1/64) 0.016 0.396
27 0.014 0.360
28 0.013 0.321
29 0.011 0.286
30 0.010 0.255
31 0.0089 0.226
32 0.0080 0.200
33 0.0071 0.180
34 0.0063 0.160
35 0.0056 0.142
36 0.0050 0.130
37 0.0045 0.114
38 0.0040 0.100
Optimizing Your Use of the Conversion Chart

To maximize efficiency when working with different measurement systems:

  • Identify requirements: Before beginning any metalworking project, clearly determine the necessary gauge size and its corresponding inch or millimeter equivalent.
  • Quick reference: Use the table to instantly find conversions between gauge, inch, and millimeter measurements.
  • Verify accuracy: Always double-check converted measurements against the chart to prevent errors.
  • Accessibility: Keep a printed copy at your workstation or save a digital version for mobile access during projects.
Advantages of This Reference Guide

This conversion table offers several benefits for professionals and hobbyists:

  • Comprehensive coverage: Includes standard B&S gauge sizes for most common applications.
  • Precision: Measurements provided to three decimal places ensure technical accuracy.
  • Time-saving: Eliminates the need for manual calculations or multiple reference tools.
  • Practical application: Suitable for various metalworking disciplines including jewelry making, machining, and fabrication.

This standardized reference tool helps metalworkers maintain consistency across projects while reducing the potential for measurement errors that could compromise quality or material usage.