Convert between gauge sizes, millimeters, and inches instantly. Comprehensive reference chart for all piercing types with professional-grade accuracy.
"As a piercer, I hated seeing 'near enough' jewelry sizes. A fraction of a millimeter is the difference between a comfortable heal and a migration disaster. I built this converter to be the clinical bridge between confusing gauge numbers and the exact millimeter precision I demand in my own manufacturing."
Founder & Piercing Expert
Clinical History Verified
The "Gauge" system used in body piercing originates from the American Wire Gauge (AWG) standard. In this system, higher numbers represent thinner jewelry (e.g., a 20g needle is very fine), while lower numbers represent thicker jewelry (e.g., an 8g barbell is quite heavy). This inverse relationship can be confusing for both clients and apprentices, which is why converting to millimeters (mm) is the global standard for technical precision.
When a piercing is performed, the fistula (the hole) is created to a specific diameter. Even a fractional mismatch between the piercing needle and the jewelry can cause excessive trauma or "cheese-cutter" effect migration. Using a gauge converter ensures that your replacement jewelry perfectly matches the anatomical requirements of your healed piercing track.
Most earlobe piercings are performed at 20g (0.8mm) or 18g (1.0mm). Standard body piercings for the navel, nipple, or tongue are typically 14g (1.6mm). For larger gauge projects like stretched lobes, the jumps between sizes become more significant; for instance, the move from 2g to 0g is a full 2mm jump, requiring significant caution and anatomical readiness.
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