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Standard Wire Gauge (SWG) to Millimeter Conversion Chart

Gauge mm Diameter Common Uses 
8g. 4
9g.  3.5
10g. 3 Welded mesh (50mm aperture):

  • Security fencing, strong garden fencing
  • large-dog enclosures
12g. 2.5 Welded mesh (50 mm aperture):

  • Security fencing, garden fencing
  • large-dog enclosures, sheep, deer & goat fencing
14g. 2 Welded mesh (25mm – 50mm aperture):

  • Garden fencing
  • medium-dog enclosures, fox, sheep, deer, goat fencing
15g. 1.8
16g. 1.6 Welded mesh (13mm – 25mm aperture):

  • Small bird aviaries, pet rabbit runs etc.

Welded mesh (13mm– 20mm aperture):

  • Rodent cages and parakeet aviaries

Welded mesh (25mm aperture):

  • Cat enclosures, squirrel protection, tree guards

Welded mesh (50mm aperture):

  • Garden fencing. Small-dog enclosures
17g. 1.4
18g. 1.2 Chicken wire (31mm aperture):

  • Poultry enclosures, rabbit protection

Welded mesh (13mm – 25mm):

  • Small bird aviaries, pet rabbit runs etc.
19g. 1 Chicken wire (50 mm aperture):

  • Poultry enclosures.

Rabbit netting can (31 mm aperture):

  • Rabbit protection

Welded mesh you (13mm – 25mm aperture):

  • Small bird aviaries, pet rabbit runs etc.
20g. 0.9 Chicken wire (25mm aperture:

  • Poultry enclosures, roof thatching, loft insulation 
21g. 0.8
22g. 0.7 Chicken wire help (13mm aperture):

  • Poultry enclosures, fruit cages

Fine welded or woven mesh:

  • Rodent protection, wild bird feeders
23g. 0.6 Fine Stainless woven mesh:

  • Material and chemical filtration
25g. 0.5 Fine Stainless woven mesh:

  • Material and chemical filtration