Piercing Gauge Sizes Explained: Ear Piercings and Belly Button (Simple, Clear, No Guessing)
Shopping for piercing jewellery should feel fun and effortless. Then you see 16G, 18G, or 14G and suddenly it feels like you need a decoding chart.
Here is the good news. Gauge size is just the thickness of the post (the part that goes through your piercing). The slightly annoying part is that the smaller the number, the thicker the jewellery. So 14G is thicker than 16G, and 16G is thicker than 18G.
Once you know that, choosing the right piercing gauge gets way easier, and your piercings tend to stay a lot happier too.
Quick Piercing Gauge Chart (Gauge to MM)
If you are searching things like “what is 16g in mm” or “18g vs 16g”, this is the quick cheat sheet.
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20G = 0.8mm (thin and common for standard lobe earrings)
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18G = 1.0mm (common for lobes and upgraded piercing studs)
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16G = 1.2mm (the most common cartilage piercing gauge)
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14G = 1.6mm (the standard belly button piercing gauge)
Those tiny millimetre differences matter more than people realise, especially for cartilage piercings. The right gauge piercing jewellery helps your jewellery sit properly, move less, and feel comfy all day.
Common Gauges for Ear Piercings
Lobe piercing gauge
Most standard lobe piercings are 20G or 18G.
If you have worn classic fashion studs with butterfly backs for years, you are usually in the 20G world. If you have upgraded to piercing style jewellery like flat back earrings, you are often 18G.
At Rapunzille, this is one of the most common reasons someone says “my new earrings feel different” because the style of jewellery often comes with a different earring gauge size.
Upper lobe and stacked lobe gauge
Upper lobes commonly sit at 18G, but 16G is also popular if you wear flat backs and love a more secure feel.
If you are building a cute, curated ear stack, this is the zone where getting your ear piercing gauge size right makes everything feel smoother and more consistent.
Cartilage piercing gauge
This includes helix, forward helix, tragus, conch, daith, rook, and snug.
Most cartilage piercings are typically 16G. This is the standard cartilage gauge because it is thick enough to feel stable and reduce extra movement, but still comfortable for everyday wear.
If your cartilage jewellery constantly feels like it is shifting, that is often a sign the fit, length, or gauge is not quite right.
Belly Button (Navel) Piercing Gauge
Most belly button piercings are 14G.
That is the standard thickness for navel bars and most belly button jewellery. One quick note though: belly button jewellery also comes in different bar lengths, which changes how it sits. Gauge tells you thickness. Bar length tells you fit.
What Happens If Your Piercing Gauge Is Wrong?
If jewellery is too thin, it can move around more than it should. That extra movement can lead to irritation over time.
If jewellery is too thick, it might not fit. Forcing it through can cause swelling, micro-tears, and a very unhappy piercing. Your jewellery should slide in smoothly. If it does not, pause and check the size.
How to Figure Out Your Gauge Size Quickly
If you are not sure what you have, you are not alone. Most people do not know their piercing gauge size until they shop for a new piece.
Try this:
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Check an old order confirmation (gauge is often listed)
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Ask your piercer what you were pierced with
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Use the most common standards:
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Lobes: 20G to 18G
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Most cartilage: 16G
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Belly button: 14G
If you want a definite answer, a professional piercer can measure your jewellery in seconds.
Piercing Gauge Sizes FAQ (SEO-Friendly)
What does gauge mean in piercings?
Gauge means the thickness of the jewellery post that goes through your piercing. It is not the hoop diameter or the bar length.
Is 16G bigger than 18G?
Yes. 16G is thicker than 18G. Smaller gauge number means thicker jewellery.
Is 14G bigger than 16G?
Yes. 14G is thicker than 16G. 14G is commonly used for belly button (navel) piercings.
What is 16G in mm?
16G is 1.2mm.
What is 18G in mm?
18G is 1.0mm.
What is 20G in mm?
20G is 0.8mm.
What gauge are normal earrings?
Most “normal” fashion earrings for the lobe are usually 20G (0.8mm), sometimes 18G (1.0mm).
What gauge are lobe piercings?
Most lobe piercings are 20G or 18G, depending on whether you wear fashion studs or piercing-style jewellery like flat backs.
What gauge are cartilage piercings?
Most cartilage piercings (helix, tragus, conch, daith, rook, forward helix) are typically 16G (1.2mm).
What gauge is a belly button piercing?
Most belly button piercings are 14G (1.6mm).
Can I put 16G jewellery in an 18G piercing?
Sometimes, but not always. If your piercing has been wearing 18G for a long time, 16G may feel snug. Do not force it. If you want to switch sizes comfortably, a piercer can help.
Can I put 18G jewellery in a 16G piercing?
Yes, it often fits, but it may feel a little looser and can move more. If movement irritates your piercing, sticking with the correct gauge usually feels better.
Why does my piercing jewellery feel tight or hard to insert?
Common reasons include the wrong gauge, the wrong bar length, swelling, or the piercing not being fully healed. Jewellery should slide in smoothly. If it does not, stop and check sizing.
How do I know what gauge I am?
Check an old order confirmation, ask your piercer, or compare to the common standards: lobes 20G to 18G, cartilage 16G, belly button 14G.