Quick Answer
An ear gauge size chart converts gauge numbers into millimetres and inches so you can match jewelry to an existing piercing or to a stretched lobe. The scale runs in reverse: a lower gauge number means a thicker piece, so 20G (0.8 mm) is thinner than 00G (about 10 mm). Beyond 00G, sizing switches to inch fractions rather than gauge numbers. Gauge only describes thickness, so diameter and wearable length still have to be checked separately on each listing.
Key Takeaways
- Lower gauge number means thicker jewelry. 20G is the thinnest common size; 00G is the largest number still in common use.
- Past 00G, sizes are written as inch fractions (7/16″, 1/2″, 5/8″) rather than gauge numbers.
- Gauge is thickness only. Length and diameter are separate measurements and are not implied by gauge.
- Charts disagree on 00G: some list 9.3 mm, others 10 mm. Check what the specific listing states.
- If a piercing is fresh, irritated, or being stretched, the pace and the sizing are a professional piercer’s call, not a chart’s.
Ear gauge size chart
| Gauge | Millimetres | Inches | Where it usually appears |
|---|---|---|---|
| 20G | 0.8 mm | 0.032″ | Fine nostril and ear jewelry; smallest common earring |
| 18G | 1.0 mm | 0.040″ | Standard lobe earrings, nostril, small hoops |
| 16G | 1.2 mm | 0.047″ | Cartilage, helix, tragus, labret, eyebrow |
| 14G | 1.6 mm | 0.063″ | Many body placements; common first stretching size for some |
| 12G | 2.0 mm | 0.078″ | Early lobe stretching |
| 10G | 2.4 mm | 0.094″ | Stretched lobes |
| 8G | 3.2 mm | 0.125″ | Stretched lobes |
| 6G | 4.0 mm | 0.157″ | Stretched lobes |
| 4G | 5.0 mm | 0.197″ | Stretched lobes |
| 2G | 6.0 mm | 0.236″ | Stretched lobes |
| 0G | 8.0 mm | 0.315″ | Stretched lobes |
| 00G | 9.3-10 mm | 0.375-0.394″ | Largest gauge-numbered size; charts differ (see below) |
| 7/16″ | 11.0 mm | 0.4375″ | Plugs and tunnels, inch sizing begins |
| 1/2″ | 12.7 mm | 0.500″ | Plugs and tunnels |
| 9/16″ | 14.3 mm | 0.5625″ | Plugs and tunnels |
| 5/8″ | 15.9-16 mm | 0.625″ | Plugs and tunnels |
| 11/16″ | 17.5 mm | 0.6875″ | Plugs and tunnels |
| 3/4″ | 19.0 mm | 0.750″ | Plugs and tunnels |
| 13/16″ | 20.7 mm | 0.8125″ | Plugs and tunnels |
| 7/8″ | 22.2 mm | 0.875″ | Plugs and tunnels |
| 1″ | 25.4 mm | 1.000″ | Large plugs and tunnels |
Two entries in that table carry a range rather than a single number, and that is deliberate. Sizes at the gauge-number end follow a wire-gauge convention, while sizes past 00G follow inch fractions, and the two systems do not meet cleanly.
Why 00G is listed as two different numbers
Some charts give 00G as 9.3 mm and some give 10 mm. Both appear in real product listings.
The 9.3 mm figure comes from the wire-gauge convention that the smaller sizes follow. The 10 mm figure is the size many body jewelry sellers actually stock and label as 00G, because 10 mm is a round number that sits cleanly next to the millimetre sizes used above it. Neither is a typo, and neither is universally “wrong”.
Practically: if you are buying 00G jewelry to match existing 00G jewelry, do not assume. Read the millimetre value on the listing you are buying, and if it is not stated, ask before ordering. Material wording works the same way: see Material Certifications & Safety Info for how grades and finishes are documented on this site. A 0.7 mm difference is small on paper and very noticeable in a stretched lobe.
The same rounding gap appears at 5/8″, listed as both 15.9 mm and 16 mm. It matters less there, but the principle is the same.
How gauge numbers work
The gauge scale is inverted, which is the single most confusing thing about shopping for ear jewelry. A 20G piece is thin. An 8G piece is thick. The number went down and the jewelry got bigger.
Gauge numbers were inherited from wire manufacturing, where the numbering counted drawing steps rather than measuring the wire directly. Body jewelry kept the convention for sizes up to 00G. Past that point, the numbers stop being useful, so sellers switched to inch fractions and millimetre values instead.
That is why a chart jumps from 00G to 7/16″ instead of continuing to 000G. The numbering system ran out, not the sizes.
The convention itself is documented as American Wire Gauge, whose nominal diameters are specified in ASTM B258. Two caveats follow from that. First, ASTM B258 specifies wire diameters, not jewelry, so applying it to body jewelry is a convention rather than a regulated requirement. Second, sellers round: a 00G piece may be labelled 9.3 mm or 10 mm depending on which convention the seller follows. That is exactly why the millimetre value on the listing outranks the gauge number in the title.
Common ear piercing sizes by placement
Different ear placements tend to be pierced at different thicknesses, and the starting size is usually chosen by the piercer rather than by the buyer.
| Placement | Gauge you will usually see | What else decides the fit |
|---|---|---|
| Lobe | 20G, 18G | Post thickness and backing type; standard earrings are often thinner than body jewelry |
| Helix / cartilage | 18G, 16G | Wearable length and backing; a flat back changes how the piece sits |
| Tragus | 16G, 18G | Small wearable length; the front has to stay clear of the ear canal |
| Conch | 16G, 14G | Hoop diameter if a ring; post length if a stud |
| Daith | 16G, 14G | Ring diameter and closure type; clickers need room to hinge |
| Rook | 16G, 14G | Curved barbell length and the angle of the ridge |
| Industrial | 14G | Straight bar length, which is measured end to end |
The table describes common practice, not a requirement. Piercers choose starting sizes based on the placement and on the tissue, and a chart cannot assess either.
How to measure your current ear jewelry
The reliable way to size new jewelry is to read it off jewelry that already fits, not to estimate from a photo.
- Measure thickness, not the decoration. For a post or barbell, the gauge is the thickness of the bar itself. A decorative top can be several times wider than the bar and tells you nothing about gauge.
- Use a caliper if you have one. A digital caliper gives a direct millimetre reading. Compare that reading against the millimetre column above rather than against a gauge number, because millimetres are unambiguous.
- Record length separately. For a post, that is the wearable length between the front and the backing. For a barbell, it is the bar between the ends. For a hoop, it is the inside diameter. None of those are gauge.
- Do not measure only the visible part while worn. A post that looks correct can still be the wrong wearable length, because the part inside the tissue is not visible.
If you do not have the piece that fits, or the measurement does not match any row cleanly, that is the point to ask a professional piercer to identify the size rather than guess at the nearest value.
Gauge is one of three numbers, not the whole size
Most wrong orders come from treating gauge as the complete size. It never is.
- Gauge tells you thickness. It is the same number for a short post and a long post.
- Wearable length tells you how far the jewelry spans. Two 16G posts can differ by several millimetres in wearable length.
- Diameter applies to rings and hoops, and describes the inside space, not the outside width.
A 16G hoop and a 16G stud share a gauge and are not interchangeable. A 14G belly bar and a 14G tongue bar share a gauge and are not interchangeable. Gauge is the starting point for a comparison, not the answer to it.
This is also why a chart alone cannot tell you what to buy. It converts units; it does not know your measurement.
Stretching: sizes are the easy part
Scaling up a lobe passes through the same sizes in the chart, but the size sequence is not the hard part and a chart should not be read as a schedule.
What a size chart can tell you is what the next millimetre value is. What it cannot tell you is whether your lobe is ready for it. That judgement involves tissue condition, how the current jewelry sits, and how the previous size settled, and it is made by looking at the ear, not by counting weeks.
Two things are worth stating plainly because they are structural rather than medical:
- A gauge jump is a real change in tissue load. Moving from 10G (2.4 mm) to 8G (3.2 mm) is a 0.8 mm change in diameter, which is a meaningful step at that size.
- Plugs and tunnels are not the same product. A single-flare plug has a wearable flange on one side; a tunnel is hollow. Both are sized by the same chart and both behave differently in a lobe. See ear plug vs tunnel and single flare vs double flare plugs for the construction differences.
If you want the general framework rather than the ear-specific one, the piercing gauge chart by jewelry type covers placements outside the ear. This page stays on ears.
What to buy after checking your size
Once you have a millimetre reading and a length or diameter, the shopping step is a comparison rather than a guess.
Browse the ear piercing jewelry collection for current styles at standard ear sizes, and the 0 gauge plugs or 00 gauge plugs ranges once you are past the gauge-number sizes. Treat the category pages as a filter, not as proof: the individual listing has to state the millimetre value and the length or diameter before the piece is a real candidate.
For conversions between inches and millimetres at sizes outside the common rows, the body jewelry conversion chart handles the arithmetic. For plugs specifically, how to determine the correct plug size walks through the same measurement logic applied to plugs.
What this guide cannot answer
This page converts sizes and explains how the numbers work. It cannot determine:
- What gauge your own piercing actually is, if you cannot measure the jewelry.
- What length or diameter you need, which depends on your anatomy and on the jewelry that currently fits.
- Whether a lobe is ready to move up a size. Readiness is a professional assessment made in person.
- What to do about pain, swelling, tearing, or a lobe that will not settle. That is a reason to see a professional piercer, not to consult a chart.
A size chart is a unit converter with context. It is not a fitting service, and it is not care guidance.
Common mistakes
- Reading gauge as size. A lower number is thicker, and thickness is not length.
- Measuring the decorative end. The top of a stud or the ball of a barbell is not the gauge.
- Assuming 00G is one number. Charts give 9.3 mm and 10 mm, and listings follow different conventions.
- Buying a hoop by outside width. Hoops are specified by inside diameter.
- Using the inch column to order when the listing is in millimetres. Convert once, then compare like with like.
- Treating a stretching chart as a schedule. The size order is real; the timing is individual.
FAQ
What is the smallest ear gauge size?
20G, at approximately 0.8 mm, is the thinnest size in common use for ear jewelry. Standard fashion earrings are sometimes thinner still, but body jewelry sold for piercings usually starts at 20G and steps up to 18G, which is about 1.0 mm.
Is 00G the same as 10 mm?
Not on every chart. Many sellers label 10 mm as 00G, while the wire-gauge convention gives roughly 9.3 mm for the same designation. The difference is under a millimetre but is noticeable in a stretched lobe, so check the millimetre value on the specific listing rather than assuming.
What size is a normal ear piercing?
Most standard lobe piercings are done at 20G or 18G. Cartilage placements are often 18G or 16G. The starting size is chosen by the piercer based on the placement and your tissue, so a chart shows what is common rather than what applies to you.
How do I know what gauge my earrings are?
Measure the thickness of the post or bar with a caliper in millimetres, then match that reading to the millimetre column. Do not measure the decorative front, and do not measure a hoop’s outside width when what you need is the inside diameter.
Does a bigger gauge number mean bigger jewelry?
No, it is the reverse. A lower gauge number means thicker jewelry, so 8G is thicker than 16G. The numbering comes from wire manufacturing and was inherited by body jewelry for sizes up to 00G, after which inch fractions are used instead.
Can I skip sizes when stretching?
That is a pacing and tissue question, not a chart question, and it belongs with a professional piercer who can see the lobe. What a chart can tell you is the millimetre gap between two sizes; whether that gap is appropriate for your ear at this moment is not something a conversion table can judge.
Editorial note
Editorial note: This guide is for jewelry education and shopping support, not medical advice. For fresh, painful, swollen, infected, irritated, migrating, or anatomy-specific piercings, consult a professional piercer or qualified clinician. Reviewed for sizing language, material safety wording, care boundaries, and product-selection clarity.