Size charts
Ear gauge size chart
Gauge numbers run backward: the higher the number, the thinner the jewelry. Jewelry sold as 18 gauge is about 1.0 mm thick, 14 gauge 1.6 mm, 0 gauge 8 mm and 00 gauge 10 mm. Past 00g, sizes are given in inches (7/16, 1/2 and up) or in millimeters.
Data checked October 20, 2026 against the sources listed below.
Gauge to mm and inches
Gauge to mm and inches
| Gauge | Sold as | AWG standard (mm) | AWG standard (inches) |
|---|---|---|---|
| 20g | 0.8 mm | 0.81 mm | 0.032 in |
| 18g | 1.0 mm | 1.02 mm | 0.040 in |
| 16g | 1.2 mm | 1.29 mm | 0.051 in |
| 14g | 1.6 mm | 1.63 mm | 0.064 in |
| 12g | 2.0 mm | 2.05 mm | 0.081 in |
| 10g | 2.5 mm | 2.59 mm | 0.102 in |
| 8g | 3.0 mm | 3.26 mm | 0.128 in |
| 6g | 4.0 mm | 4.12 mm | 0.162 in |
| 4g | 5.0 mm | 5.19 mm | 0.204 in |
| 2g | 6.0 mm | 6.54 mm | 0.258 in |
| 0g | 8.0 mm | 8.25 mm | 0.325 in |
| 00g | 10.0 mm | 9.27 mm | 0.365 in |
Sizes above 00 gauge
| Inches | Exact mm | Nearest whole mm |
|---|---|---|
| 7/16 in | 11.11 mm | 11 mm |
| 1/2 in | 12.70 mm | 13 mm |
| 9/16 in | 14.29 mm | 14 mm |
| 5/8 in | 15.88 mm | 16 mm |
| 11/16 in | 17.46 mm | 17 mm |
| 3/4 in | 19.05 mm | 19 mm |
| 13/16 in | 20.64 mm | 21 mm |
| 7/8 in | 22.23 mm | 22 mm |
| 15/16 in | 23.81 mm | 24 mm |
| 1 in | 25.40 mm | 25 mm |
How to measure
- 1
Measure the part that goes through the piercing
Gauge is the thickness of the post, ring or plug where it passes through your ear. Measure it across with a caliper, or lay it on the printed circles.
- 2
Use the chart at actual size
Print this page at 100% scale and check the 50 mm bar with a ruler before comparing jewelry with the circles.
- 3
Check the millimeter size on every listing
Brands round gauge sizes differently, so the millimeter figure is the safer number to match. A professional piercer can measure your current size if you are not sure.
Why 00 gauge can mean 9.3 mm or 10 mm
Gauge numbers come from the American Wire Gauge, which sets 00 AWG at 9.27 mm and 0 AWG at 8.25 mm. Body jewelry is sold in rounded metric sizes instead: 00g is listed as 10 mm and 0g as 8 mm. Most of Europe sizes body jewelry in millimeters, while US shops use gauge numbers, so the same piece can carry both labels.
Frequently asked questions
Jewelry sold as 00 gauge is usually 10 mm. The wire gauge standard itself puts 00 AWG at 9.27 mm.
14 gauge. Lower numbers are thicker: 14g is about 1.6 mm and 16g about 1.2 mm.
About 8 mm as sold. The wire gauge standard gives 8.25 mm.
Inch sizes: 7/16 inch (11.1 mm), then 1/2 inch (12.7 mm), 9/16 inch (14.3 mm), 5/8 inch (15.9 mm) and up to 1 inch (25.4 mm).
Gauge numbers come from the US wire gauge standard. Most European shops list body jewelry in millimeters, so match the mm size on the listing.
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Sources
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