Piercing Size & Gauge Guide: Everything You Need to Know
The most common piercing sizes are 16 gauge (1.2mm) and 18 gauge (1.0mm). Standard earlobe piercings are typically 20G–18G, cartilage piercings (helix, tragus, conch) are 16G, and navel/nipple piercings are 14G. Post length for flat-back labrets most commonly ranges from 6mm to 10mm, with 8mm fitting most ear cartilage placements.
Piercing Size & Gauge Complete Guide
Getting the wrong size isn't just uncomfortable — it can cause migration, irritation bumps, and even rejection. This guide covers everything you need to know about piercing gauges, post lengths, hoop diameters, and how to measure for the perfect fit.
Gauge Size Chart
| Gauge | Millimeters | Inches | Common Piercing Locations |
|---|---|---|---|
| 20G | 0.8mm | 0.032" | Standard earlobe (some) |
| 18G | 1.0mm | 0.040" | Earlobe, helix, nostril |
| 16G | 1.2mm | 0.051" | Cartilage (helix, tragus, conch, daith, rook) |
| 14G | 1.6mm | 0.064" | Navel, nipple, industrial, septum |
| 12G | 2.0mm | 0.081" | Septum (some), tongue, larger cartilage |
| 10G | 2.4mm | 0.102" | Stretched piercings, some initial septum |
Flat-Back Labret Post Length Guide
| Length | Best For | Notes |
|---|---|---|
| 6mm | Thin cartilage (helix, forward helix), nostril | Snug fit; measure carefully |
| 8mm | Most ear cartilage (helix, tragus, conch) | The most common post length for ear piercings |
| 10mm | Thicker cartilage, initial swelling allowance | Good for fresh piercings with anticipated swelling |
| 12mm | Navel, thick tissue | Curved barbell applications |
Hoop Diameter Guide
| Diameter | Best For |
|---|---|
| 6mm | Nostril (snug fit), helix (close ring) |
| 8mm | Nostril (comfortable), daith, helix |
| 10mm | Septum, conch, daith, helix |
| 12mm | Septum (larger), conch, lobe hoops |
How to Measure Your Piercing Size
- Know what your piercer used: The most reliable method. Your piercer should have told you the gauge and length. If not, ask them — they keep records.
- Measure existing jewelry: Use digital calipers to measure the wearable length of your current post (from the base of the flat back to the top of the threading/pin). For hoops, measure the inner diameter.
- Don't guess: A post that's too short embeds into skin. One that's too long snags on everything. If you're between sizes, size up — you can always switch to a shorter post once swelling subsides.
FAQ: Piercing Sizes
What gauge is my ear piercing? If pierced at a professional studio, most ear cartilage piercings are 16G (1.2mm) and standard earlobes are 18G–20G. Piercing guns typically use 20G, but professional piercers avoid guns entirely.
Can I change my piercing gauge? Yes — stretching (upsizing) should be done gradually (0.5mm increments, months apart). Downsizing a healed piercing is as simple as inserting smaller jewelry.
What post length do I need for a helix piercing? 8mm is standard for most helix piercings. During initial healing with swelling, 10mm may be more comfortable. Once healed and swelling subsides, switch to 6mm–8mm for a flush fit.
How do I know if my post is too short? Signs include: the jewelry sits tight against skin with no visible post, the flat back creates an indentation, or skin grows over the backing. Remove immediately and switch to a longer post.
What diameter hoop for a nostril piercing? 8mm is the most common nostril hoop diameter for a comfortable fit. 6mm creates a tighter look. Measure from your piercing hole to the edge of your nostril — this distance is roughly the minimum hoop diameter you need.