Piercing Sizes Chart: Standard Gauges, Lengths & Diameters
Buying piercing jewelry online and not sure what size to order? This is the quick reference you need. Every standard gauge, post length, and ring diameter for every common piercing type — all in one easy-to-use chart.
Getting the wrong size isn't just uncomfortable — it can cause real problems. A post that's too thin concentrates pressure on a tiny point of tissue and can slowly migrate through the skin. A post that's too short leaves no room for swelling and risks the jewelry becoming embedded. These are the sizes most professional piercers use for initial jewelry. Your exact fit can vary based on your anatomy, swelling, and personal preference. When in doubt, ask your piercer what gauge and length they used, or measure your current jewelry before you order.
How Piercing Sizes Work
Three measurements matter when buying piercing jewelry:
- Gauge (G): The thickness of the post or wire. Lower number = thicker. 20G is thin (nostrils, earlobes). 14G is thicker (belly buttons, tongues). Measured in gauge numbers or millimeters.
- Length: The distance between the two ends of a barbell or labret post. Measured in millimeters. This gives room for swelling or tissue thickness.
- Diameter: The inner measurement across a hoop or ring. Measured in millimeters. Determines how snug or loose the ring sits.
Gauge Conversion Chart
| Gauge | Millimeters | Inches | Common uses |
|---|---|---|---|
| 20G | 0.8mm | 1/32" | Earlobe, nostril |
| 18G | 1.0mm | 5/128" | Earlobe, nostril, cartilage (some piercers) |
| 16G | 1.2mm | 3/64" | Cartilage, septum, lip, eyebrow, daith, tragus |
| 14G | 1.6mm | 1/16" | Belly button, tongue, nipple, industrial |
| 12G | 2.0mm | 5/64" | Septum (stretched), nipple (some piercers) |
Important: 20G is for earlobes and nostrils only. Not cartilage, not lip. Cartilage piercings need 16G minimum for stability and to help prevent migration. Our piercing migration guide explains why thicker gauge matters.
Standard Sizes by Piercing Type
| Piercing | Standard gauge | Post length | Ring diameter | Notes |
|---|---|---|---|---|
| Earlobe | 20G or 18G | 6-8mm | 8-10mm | Most standard earrings fit 20G |
| Second/third lobe | 20G or 18G | 6mm | 6-8mm | Slightly smaller hoops for higher placement |
| Helix | 16G | 6-8mm | 6-8mm | Initial post 8mm for swelling, downsize to 6mm after |
| Forward helix | 16G | 6mm | 6mm | Tight space, shorter post after healing |
| Tragus | 16G | 6-8mm | 6mm | Flat-back labret recommended for earbud clearance |
| Conch | 16G | 6-8mm | 10-12mm | Larger ring diameter — hoop wraps around outer ear rim |
| Daith | 16G | — | 6-8mm | Usually a ring — heals best with clicker or captive bead |
| Rook | 16G | 8mm | 6-8mm | Curved barbell or ring, sits vertically |
| Industrial | 14G | 32-38mm | — | Long straight barbell linking two cartilage points, length depends on ear anatomy |
| Nostril | 20G or 18G | 6-7mm | 6-8mm | L-bends and screws fit by shape, not length. See our nose ring size guide |
| Septum | 16G or 14G | — | 8-10mm | Circular barbell or clicker, diameter varies by nose size |
| Lip / labret / Monroe | 16G | 8-10mm | 8-10mm | Initial post 10mm for swelling, downsize to 8mm after healing |
| Belly button | 14G | 10-12mm | — | Curved barbell. If your navel collapses when you sit, ask about floating navel jewelry |
| Nipple | 14G | 12-16mm | — | Straight barbell, length must clear tissue base |
| Tongue | 14G | 16-18mm initial, 12-14mm healed | — | Extra-long initial barbell for significant swelling |
| Eyebrow | 16G | 8-10mm | — | Curved barbell, surface piercing — heavier gauge reduces migration risk |
Ring and Hoop Diameter Guide
If you're switching from a stud to a hoop, diameter is what determines how the ring fits around your piercing. Too small pinches and puts pressure on healing tissue. Too large hangs loose and snags easily.
| Diameter | Best for |
|---|---|
| 5mm | Very snug fit on thin earlobes, small nostrils |
| 6mm | Helix, tragus, forward helix, daith, tight nostril hoop |
| 8mm | Most popular all-around — helix, lobe, nostril, septum, daith |
| 10mm | Septum, conch, lip, larger earlobes |
| 12mm | Conch, larger septum, nipple shield |
For a deeper dive into ring sizing, see our ultimate sizing guide.
How to Measure Your Current Jewelry
If you already have jewelry that fits perfectly and want to reorder the same size:
- Gauge: Hardest to measure at home. If you know what your piercer used, go with that. Otherwise, most cartilage is 16G, most lobes/nostrils are 20G, and most belly/tongue/nipple is 14G.
- Post length: Remove the ends (balls, gems, discs). Measure just the bar between where the ends screw or push in. Use a ruler with millimeter markings — a single millimeter off can mean the difference between comfortable and painful.
- Ring diameter: Measure the inside distance across the ring (not including the wire thickness). A small ruler or digital caliper works best.
Initial vs Healed Jewelry Sizes
Your piercer uses a longer post for initial jewelry to accommodate swelling. During the first few weeks of healing, tissue can expand by 30-50% — a tight post would leave no room for that and risks embedding. Once healed, you downsize to a shorter, snugger fit. But don't downsize too early — leaving the longer bar in too long is better than switching too soon. See our healing stages guide and embedded piercing guide for why timing matters.
| Piercing | Initial post length | Healed post length |
|---|---|---|
| Helix / cartilage | 8mm | 6mm |
| Tragus | 8mm | 6mm |
| Lip / labret | 10mm | 8mm |
| Belly button | 12mm | 10mm |
| Tongue | 18mm | 12-14mm |
| Nipple | 16mm | 12-14mm |
FAQ
What gauge is a standard earring?
Most standard fashion earrings are 20G (0.8mm). Earrings from a professional piercer may be 18G (1.0mm). Both fit standard earlobe piercings.
What size belly button ring do I need?
Standard is 14G with a 10mm curved barbell for healed piercings. Initial jewelry is usually 12mm to allow for swelling. If your navel collapses when you sit, ask your piercer about floating navel jewelry — it's designed for that anatomy. Shop our belly button ring collection for 14G options.
What gauge is a nose ring?
Most nose piercings are 20G or 18G. If you're unsure, 20G is the most common and fits the widest range of nostril jewelry. Our nose ring size guide has the full breakdown.
Can I put a 16G in a 14G piercing?
Yes — a 16G is thinner than 14G, so it will fit. But over time the channel may shrink to the smaller gauge, making it harder to go back to 14G later. If you want to maintain the larger gauge, wear 14G jewelry regularly.
Can I put a 14G in a 16G piercing?
Not without stretching. Going up in gauge (thicker) requires a gradual stretch with a taper, done by a piercer. Forcing a larger gauge into a smaller hole risks tearing the channel.
How do I know if my hoop diameter is right?
A properly fitted hoop sits close to the skin without pinching or pulling. If it presses into the piercing or leaves a dent, it's too small. If it hangs far from the ear or swings freely, it's too large. 8mm is the most popular all-around diameter for ear piercings.
Do all piercers use the same gauge?
Mostly, but not always. Some piercers prefer 18G for cartilage while others use 16G. Some use 18G for nostrils while others use 20G. Always ask your piercer what gauge they used so you can order matching jewelry.
Bottom Line
Bookmark this page for next time you're shopping for piercing jewelry. Quick rule of thumb: earlobes and nostrils are 20G, cartilage and facial piercings are 16G, belly buttons and tongues are 14G. Measure your current jewelry if you want an exact match, or ask your piercer what they used.
Every piece in our titanium collection lists gauge, length, and diameter right in the product description. Our sizing page and quality and testing page have additional reference material. If you're still unsure, reach out — we'll help you find the right fit.
This page is for general reference. Individual anatomy varies. Consult your piercer for personalized sizing recommendations.