Piercing Jewellery Sizing: Gauge and Length Explained
Buying piercing jewellery online goes wrong for one reason more than any other: the wrong size. Every piece has two measurements that matter, the gauge (how thick it is) and the length or diameter (how long or wide it is). Get both right and the piece sits comfortably and looks correct. Get them wrong and it pinches, migrates, or will not go in at all. Here is how piercing jewellery sizing works, in plain terms.
Gauge: the thickness, and why the numbers feel backwards
Gauge is the thickness of the bar or wire that passes through your piercing. The confusing part is that a bigger number means a thinner piece. A 20 gauge stud is thin; a 14 gauge is noticeably chunkier. This is not arbitrary. Body jewellery uses the Brown & Sharpe American Wire Gauge system, which assigns lower numbers to thicker wire, as the Wikipedia entry on body piercing explains. So as the gauge number goes up, the metal gets thinner.
Here are the common gauges you will meet, with their thickness in millimetres.
| Gauge | Thickness | Often used for |
|---|---|---|
| 20g | 0.8 mm | Fine nostril studs, some earlobe studs |
| 18g | 1.0 mm | Earlobes, nostril, some helix |
| 16g | 1.2 mm | Helix, cartilage, lip, eyebrow, septum |
| 14g | 1.6 mm | Navel, tongue, septum, industrial |
| 12g | 2.0 mm | Larger navel, stretched lobes |
| 10g | 2.4 mm | Stretched piercings |
| 8g | 3.2 mm | Stretched piercings |
The single most important rule: match the gauge of a new piece to the gauge your piercing already is. Forcing a thicker piece into a thinner piercing tears tissue, and a piece that is too thin can let the piercing shrink. If you are not sure of your gauge, a professional piercer can measure it in seconds.
Length and diameter: the fit
The second measurement depends on the style of jewellery.
Barbells and labret studs are measured by the length of the bar between the two ends, not counting the balls or discs. A flat-back labret for a helix might be 6 mm; a tongue barbell is often longer to allow for swelling. Too short and it presses into the tissue; too long and it snags and moves around.
Rings, hoops, and circular barbells are measured by their internal diameter, the width of the open space inside, again not counting any beads. A septum ring and a daith ring can be the same gauge but very different diameters.
The easy way to find your size at home is to measure a piece that already fits well. Lay it flat and use a ruler, or better, a digital caliper. Measure the bar thickness for gauge, the bar length for a barbell, or the inside width for a ring. When in doubt, bring the piece in and we will measure it for you.
Common starting gauges by piercing
These are the sizes many piercings are commonly done at, but they are a rough guide, not a rule. Anatomy varies, and swelling means a fresh piercing often needs a longer bar than the healed piercing will.
- Earlobe: usually 20g or 18g
- Helix and cartilage: usually 18g or 16g
- Nostril: usually 20g or 18g
- Septum: usually 16g or 14g
- Navel: usually 14g
- Tongue: usually 14g
Because the correct size depends on your body and on how healed the piercing is, the person who pierced you is the right one to confirm your gauge and length. If you are still healing, our guide on when you can change a new piercing is worth reading before you swap anything, and best metals for a new piercing covers what the piece should be made of.
Why the right size protects your piercing
Size is about more than comfort. A bar that is too tight puts pressure on the piercing and can cause irritation bumps or push the jewellery to migrate. A piece that is too loose moves around, catches on clothing, and irritates the channel. Matching gauge and length to your piercing is one of the simplest things you can do to keep it healthy, along with choosing a safe material. If you want to plan a set of ear piercings that work together, our guide to planning an ear stack helps, and once you know your sizes, our comparison of titanium versus solid gold helps you choose the material.
Key takeaways
- Every piece has two measurements: gauge (thickness) and length or diameter (fit). You need both.
- A higher gauge number means a thinner piece, because body jewellery follows the Brown & Sharpe wire gauge system.
- Match a new piece to the gauge your piercing already is. Measure a piece that fits, using a caliper if you can.
- Common starting gauges are a guide only. Let the piercer who did the piercing confirm your size.
Frequently asked questions
Does a higher gauge number mean thicker or thinner jewellery?
Thinner. Body jewellery uses the Brown & Sharpe wire gauge system, where a larger number means a smaller thickness. A 20 gauge piece (0.8 mm) is thin, while a 14 gauge piece (1.6 mm) is much thicker. If you are stepping up in thickness, the gauge number goes down.
How do I measure my piercing jewellery size at home?
Measure a piece that already fits you. For gauge, measure the thickness of the bar. For a barbell or labret, measure the length of the bar between the ends, not counting the balls. For a ring, measure the internal diameter. A digital caliper is most accurate, but a millimetre ruler works. If you are unsure, bring the piece to us and we will measure it.
What gauge is a standard ear piercing?
Most earlobe piercings are done at 20 gauge or 18 gauge, and many cartilage or helix piercings at 18 gauge or 16 gauge. These are common starting points, not fixed rules, because anatomy and piercing technique vary. The piercer who did your piercing can tell you the exact gauge they used.
Sources
- Wikipedia: Body piercing (gauge system, Brown & Sharpe AWG, millimetre values), accessed July 2026
- Association of Professional Piercers: Jewelry for Initial Piercings (materials and fit), accessed July 2026
Sizing standards checked July 2026. Gauge and length for a specific piercing should be confirmed by a licensed professional piercer. If you spot something out of date, let us know and we will update the guide.
Visit Vanhess
Vanhess sells piercing jewellery in a range of gauges and lengths at our family-run studio at 2929 Barnet Highway, Unit 2424, in Coquitlam. We do not perform piercings, but if you bring in a piece that fits, we will measure your gauge and length and help you find the right jewellery to buy. For the piercing itself, see a licensed professional piercer. Browse our piercing jewellery collection, or call us at (604) 653-6449.
