Nose ring sizes use two separate measurements: gauge, which is the thickness of the wire or post, and inside diameter, which is the open space across a hoop. Nostril jewelry is most often sold in 20 gauge (0.81 mm) and 18 gauge (1.02 mm), with hoop diameters measured in millimeters. A lower gauge number means thicker jewelry.
This guide is for general information only and is not medical advice. Change jewelry only in a fully healed piercing, and ask a licensed professional piercer if anything feels tight, sore or unsure.
Gauge vs Diameter: The Two Numbers in Every Nose Ring Size
Gauge and diameter answer different questions. Gauge tells you how thick the jewelry is and must match your piercing channel. Diameter (for hoops) or post length (for studs) tells you how the piece sits on your nose.
| Measurement | What it describes | Applies to | Why it matters |
|---|---|---|---|
| Gauge | Thickness of the wire or post | Hoops and studs | Must match the healed piercing channel |
| Inside diameter | Open space across the hoop, inside edge to inside edge | Hoops, rings, clickers | Controls how snug or loose the hoop sits |
| Wearable post length | Length of the post from the back of the decorative top to the bend or disc | Studs, L shapes, screws, bones | Controls whether the top sits flush without pressure |
| Top size | Width of the gem or decorative end | Studs | Changes the look, not the fit |
The Association of Professional Piercers warns that jewelry which is too thin in gauge can be treated by the body like a splinter, which can lead to migration or rejection. Matching the gauge of the existing piercing, rather than choosing the thinnest option, is the first rule of choosing a nose ring size (APP, accessed October 2026).
Read the APP guidance on jewelry for initial piercings for the full standards.
Nose Ring Gauge Size Chart
Body jewelry gauges follow the American wire gauge system, in which thickness increases as the gauge number decreases. That is why an 18 gauge nose ring is thicker than a 20 gauge nose ring.
| Gauge | Exact thickness (mm) | Often labeled as | Typical use |
|---|---|---|---|
| 22g | 0.644 mm | 0.6 mm | Very fine fashion nostril pieces |
| 20g | 0.812 mm | 0.8 mm | Common nostril size |
| 18g | 1.024 mm | 1.0 mm | Common nostril size, often used by piercers |
| 16g | 1.291 mm | 1.2 mm | Septum, some nostrils |
| 14g | 1.628 mm | 1.6 mm | Septum and thicker placements |
Exact values come from the body jewelry gauge conversion table and the American wire gauge standard. Labels on product pages are usually rounded, so a "1.0 mm" piece and an "18g" piece describe the same thickness. Gauge also affects comfort for sensitive skin, and the hypoallergenic jewelry guide covers which metals to look for.
Nose Hoop Diameter Chart in mm and Inches
Nose hoop diameter is measured across the inside of the ring, and a smaller inside diameter sits closer to the nostril. The right diameter depends on how far your piercing sits from the edge of your nostril, so there is no single standard size for everyone.
| Inside diameter | Inches (exact) | Nearest common fraction | Typical look |
|---|---|---|---|
| 6 mm | 0.236 in | about 1/4 in (6.35 mm) | Snug, close to the nostril edge |
| 7 mm | 0.276 in | between 1/4 and 5/16 in | Snug to balanced |
| 8 mm | 0.315 in | about 5/16 in (7.94 mm) | Balanced, small visible gap |
| 10 mm | 0.394 in | about 3/8 in (9.53 mm) | Looser, hangs lower |
| 12 mm | 0.472 in | just under 1/2 in (12.7 mm) | Roomy, statement look |
One inch equals exactly 25.4 millimeters, so a 6 mm nose hoop measures about 0.24 inches and an 8 mm hoop about 0.31 inches. Because the common fractional sizes of 1/4, 5/16 and 3/8 inch convert to 6.35, 7.94 and 9.53 mm, an inch labeled hoop is never an exact match for a metric one (NIST, inch definition).
The conversion factor comes from the NIST definition of the inch. If you already wear hoops in your ears, the same diameter logic applies, and the hoop earring size guide shows how millimeters translate into look.
How to Measure Your Nose Ring Size in 6 Steps
The most reliable way to find your nose ring size is to measure a piece that already fits well in your healed piercing. Do this on a clean, well lit surface with a millimeter ruler or a digital caliper.
- Confirm the piercing is healed. Never remove jewelry from a fresh or tender piercing.
- Wash your hands. Work on a clean surface so small pieces are easy to see.
- Remove the jewelry gently. Stop if it does not slide out easily, and ask a piercer.
- Measure the inside diameter. For a hoop, measure across the widest open space from inside edge to inside edge, without the metal.
- Measure the gauge. Use a caliper on the wire or post, or check the original product listing. Do not guess from a photo.
- Record the result. Write down the gauge, diameter or post length, style and how it felt, then reinsert the jewelry right away.
The APP warns that you should never force jewelry into a piercing, because forcing can tear tissue. If a new piece does not go in easily, the APP guidance for healed piercings says to visit a piercer for help.
How to Choose a Snug, Balanced or Roomy Fit
A nose ring fits well when it closes securely, moves without pressing into the skin and stays comfortable when you smile or wrinkle your nose. Your piercing placement decides which diameter gives that result.
- Snug fit: a smaller inside diameter sits close to the nostril. Choose it only if the piercing sits near the edge, so the hoop does not pinch.
- Balanced fit: a medium diameter follows the nostril curve with a small gap. It is the easiest look to wear daily.
- Roomy fit: a larger diameter hangs lower and moves more. It suits higher placements and statement styles.
Shape changes the fit too. A plain seamless hoop sits differently from a decorated hoop such as the Halo Spark Nose Ring or the Forever Heart Nose Ring, because the decoration adds weight at the front. Studs and L shapes depend on post length instead of diameter. For a simple everyday look, compare the Evryday Nose Ring, and check each product page for its listed gauge and size before you order.
The APP advises replacing any jewelry that causes irritation, itching, swelling or redness, no matter how much you like the way it looks. Pressure marks, a pinching sensation or a hoop that digs into the nostril are signs that the diameter or gauge is wrong for the placement, and a professional piercer can recommend a better size (APP, accessed October 2026).
Nose Ring Size by Piercing Type
Each nose placement uses a different type of measurement, so the size you need for a nostril will not transfer to a septum. Use this as a quick reference, then confirm with your piercer.
| Placement | Main size to check | Commonly sold gauges |
|---|---|---|
| Nostril (stud) | Wearable post length and gauge | 20g, 18g |
| Nostril (hoop) | Inside diameter and gauge | 20g, 18g |
| High nostril | Post length and gauge, set by your piercer | 18g, 20g |
| Septum | Inside diameter and gauge | 16g, 14g |
A fresh piercing needs jewelry chosen and fitted by your piercer, and healing times differ by placement. Change to a new nose ring size only once the piercing is fully healed. Explore matching styles in the body jewelry edit, and keep spares in a jewelry pouch so you never mix up sizes.
Frequently Asked Questions About Nose Ring Sizes
How do I know my nose ring size?
Measure jewelry that already fits your healed piercing. For a hoop, measure the inside diameter from inside edge to inside edge in millimeters. For a stud, measure the wearable post length. Then confirm the gauge with a caliper or the original listing: 20 gauge is 0.81 mm and 18 gauge is 1.02 mm. If removal is difficult or you are unsure, ask a professional piercer to measure for you.
Is an 18G or 20G nose ring bigger?
An 18 gauge nose ring is thicker than a 20 gauge nose ring. In the American wire gauge system, a lower number means thicker wire, so 18g measures about 1.02 mm and 20g about 0.81 mm. The difference is about 0.2 mm, which is small but noticeable. The APP warns that jewelry too thin in gauge can migrate or reject, so match the gauge you already wear.
Is a 22 gauge nose ring too small?
A 22 gauge nose ring measures about 0.64 mm, which is thinner than the 20g and 18g sizes most nostril jewelry uses. It can work in a healed piercing that was made at that size, but the APP warns that jewelry too thin in gauge can migrate or reject. Never use 22g jewelry in a fresh piercing, and ask a piercer before going thinner than your current size.
How do I size up my nose ring?
To go up in diameter, choose a hoop with a larger inside measurement, for example from 8 mm to 10 mm, while keeping the same gauge. Going up in gauge, for example from 20g to 18g, means stretching the piercing, which should be done by a professional piercer. The APP says never to force jewelry in, because forcing can tear tissue.
What is the most common nose hoop diameter?
No authoritative standard sets one most common nose hoop diameter, because the right size depends on where your piercing sits. Retailers commonly offer 6 mm to 12 mm nostril hoops, and 8 mm (about 5/16 inch) is a frequent middle option. Measure the distance from your piercing to the nostril edge, or a hoop that already fits, rather than buying a size because it is popular.
Found your size? Shop the EVRY nose rings collection and check each listing for its gauge and diameter.
