ORGANIC: Natural Body Jewelry

Conversion Chart: Gauge, Inch, and Millimeter

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Here's our handy conversion chart!!!
I noticed there were mostly inexact charts posted online with estimates and conflicting information,
so I've created this to end all confusion between different measuring systems.
This is the conversion chart to end all conversion charts!
It works for converting fractional inches, decimal inches, gauges (ga), and millimeters (mm).
This chart assumes 25.4mm equals 1" exactly.

I've spent many, many hours creating this puppy and doing all the math myself (yes, I am a nerd!).
So please just link to it or print it for personal use only, no copying, reusing for your own page, etc.
I have strived to make this as accurate as possible.
Let me know if you have any suggestions. Thanks!

For more text and full explanations,
including how the gauge system works,
to view or download our older, more simple chart
which goes up to one inch, with pretty dots in the correct sizes,
and to learn what's up with the circumference column,
please proceed to the bottom of the page.

Gauges are in red.
Millimeters are in medium brown.

Gauge or Fractional Inches
Decimal inches
Metric (mm)
Circumference
(Radius x 2π) aka
(Diameter x π)
1/64" 0.0156" 0.397 mm .049"
26ga 0.0159" 0.404 mm .04995"
25ga 0.0179" 0.4547 mm .0562"
24ga 0.0201" 0.511 mm .0631"
23ga 0.0226" 0.574 mm .0710"
22ga 0.0253" 0.643 mm .0795"
21ga 0.02846" 0.723 mm .0894"
2/64" (1/32") 0.0313" 0.794 mm .098"
20ga 0.0320" 0.812 mm .101"
19ga 0.0359" 0.912 mm .113"
  0.039" 1.0 mm .123"= 3.14mm
18ga 0.040" 1.02 mm .126"
17ga 0.045" 1.14 mm .141"
3/64" 0.047" 1.19 mm .148"
16ga 0.051" 1.3 mm .160"
15ga 0.057" 1.45 mm .179"
4/64" (1/16") 0.0625" 1.59 mm .19635"= 4.99mm
14ga 0.064" 1.6 mm .201"
13ga 0.072" 1.8 mm .226"
5/64" 0.078" 1.98 mm .245"
  0.079" 2.0 mm .248"= 6.28mm
12ga 0.081" 2.06 mm .254"
11ga 0.091" 2.3 mm .286"
6/64" (3/32") 0.094" 2.38 mm .295"
10ga 0.102" 2.6 mm .320"
7/64" 0.109" 2.78 mm .342"
9ga 0.114" 2.9 mm .358"
  0.118" 3.0 mm .371"= 9.42mm
8/64" (1/8") 0.125" 3.18 mm .393"
8ga 0.12849" 3.26 mm .404"
9/64" 0.141" 3.57 mm .443"
7ga 0.144" 3.66 mm .452"
10/64" (5/32") 0.156" 3.97 mm .490"
  0.157" 4.0 mm .493"= 12.57mm
6ga 0.162" 4.1 mm .509"
11/64" 0.172" 4.37 mm .540"
5ga 0.182" 4.6 mm .572"
12/64" (3/16") 0.1875" 4.76 mm .59"
  0.197" 5.0 mm .619"= 15.70mm
13/64" 0.203" 5.16 mm .638"
4ga 0.204" 5.2 mm .641"
14/64" (7/32") 0.219" 5.56 mm .688"
3ga 0.229" 5.8 mm .719"
15/64" 0.234" 5.95 mm .735"
  0.236" 6.0 mm .741"= 18.85mm
16/64" (1/4") 0.250" 6.35 mm .785"
2ga 0.2576" 6.54 mm .809"
17/64" 0.266" 6.747 mm .836"
  0.276" 7.0 mm .867"= 21.99mm
18/64" (9/32") 0.281" 7.14 mm .883"
1ga 0.289" 7.3 mm .908"
19/64" 0.297" 7.54 mm .933"
20/64" (5/16") 0.3125" 7.94 mm .98"
  0.315" 8.0 mm .9896"= 25.13mm
0ga 0.3249" 8.2525 mm 1.021"
21/64" 0.328" 8.33 mm 1.030"
22/64" (11/32") 0.344" 8.73 mm 1.081"
  0.354" 9.0 mm 1.112"= 28.27mm
23/64" 0.359" 9.13 mm 1.128"
00ga 0.3648" 9.266 mm 1.146"
24/64" (3/8") 0.375" 9.53 mm 1.178"
25/64" 0.391" 9.92 mm 1.228"
  0.394" 10.0 mm 1.238"= 31.42mm
26/64" (13/32") 0.406" 10.32 mm 1.275"
000ga 0.4096" 10.4 mm 1.287"
27/64" 0.422" 10.72 mm 1.326"
  0.433" 11.0 mm 1.360"= 34.56mm
28/64" (7/16") 0.4375" 11.11 mm 1.374"
29/64" 0.453" 11.51 mm 1.423"
0000ga 0.460" 11.68 mm 1.445"
30/64" (15/32") 0.469" 11.91 mm 1.473"
  0.472" 12.0 mm 1.483"= 37.70mm
31/64" 0.484" 12.30 mm 1.521"
Gauge or Fractional Inches
Decimal inches
Metric (mm)
Circumference
(Radius x 2π) aka
(Diameter x π)
1/2" (32/64") 0.500" 12.70 mm 1.571"
  0.512" 13.0 mm 40.84mm
00000ga 0.517" 13.12 mm 1.623"
  0.551" 14.0 mm 43.98mm
9/16" (36/64") 0.5625" 14.28 mm 1.767"
000000ga 0.580" 14.73 mm 1.822"
  0.591" 15.0 mm 47.12mm
5/8" (40/64") 0.625" 15.87 mm 1.963"
  0.630" 16.0 mm 50.27mm
  0.669" 17.0 mm 53.41mm
11/16" (44/64") 0.6875" 17.46 mm 2.160"
  0.709" 18.0 mm 56.55mm
  0.748" 19.0 mm 59.69mm
3/4" (48/64") 0.750" 19.05 mm 2.356"
  0.787" 20.0 mm 62.83mm
13/16" (52/64") 0.8125" 20.64mm 2.553"
  0.827" 21.0 mm 65.97mm
  0.866" 22.0 mm 69.12mm
7/8" (56/64") 0.875" 22.22 mm 2.749"
  0.906" 23.0 mm 72.26mm
15/16" (60/64") 0.9375" 23.81 mm 2.945"
  0.945" 24.0 mm 75.40mm
  0.984" 25.0 mm 78.54mm
Gauge or Fractional Inches
Decimal inches
Metric (mm)
Circumference
(Radius x 2π) aka
(Diameter x π)
1" (64/64") 1.000" 25.40 mm 3.142" (think π)
  1.024" 26.0 mm 81.68mm
1-1/16" 1.0625" 27.0 mm 3.338"= 84.82mm
  1.102" 28.0 mm 87.96mm
1-1/8" 1.125" 28.6 mm 3.534"
  1.142" 29.0 mm 91.11mm
  1.181" 30.0 mm 94.25mm
1-3/16" 1.1875" 30.16 mm 3.731"
  1.220" 31.0 mm 97.39mm
1-1/4" 1.250" 31.75 mm 3.927"
  1.2598" 32.0 mm 100.53mm
  1.299" 33.0 mm 103.67mm
1-5/16" 1.3125" 33.3 mm 4.123"
  1.339" 34.0 mm 106.81mm
1-3/8" 1.375" 34.9 mm 4.3197"
  1.378" 35.0 mm 109.96mm
  1.417" 36.0 mm 113.10mm
1-7/16" 1.4375" 36.5 mm 4.516"
  1.467" 37.0 mm 116.24mm
  1.496" 38.0 mm 119.38mm
1-1/2" 1.500" 38.1 mm 4.712"
  1.535" 39.0 mm 122.52mm
1-9/16" 1.5625" 39.7 mm 4.909"
  1.575" 40.0 mm 125.66mm
  1.614" 41.0 mm 128.81mm
1-5/8" 1.625" 41.3 mm 5.105"
  1.654" 42.0 mm 131.95mm
1-11/16" 1.6875" 42.86 mm 5.301"
  1.693" 43.0 mm 135.09mm
  1.732" 44.0 mm 138.23mm
1-3/4" 1.750" 44.45 mm 5.498"
  1.772" 45.0 mm 141.37mm
  1.811" 46.0 mm 144.51mm
1-13/16" 1.8125" 46.04 mm 5.694"
  1.850" 47.0 mm 147.66mm
1-7/8" 1.875" 47.6 mm 5.890"
  1.8898" 48.0 mm 150.80mm
  1.929" 49.0 mm 153.94mm
1-15/16" 1.9375" 49.2 mm 6.087"
  1.969" 50.0 mm 157.08mm
Gauge or Fractional Inches
Decimal inches
Metric (mm)
Circumference
(Radius x 2π) aka
(Diameter x π)
2" 2.000" 50.8 mm 6.283" (2π)
  2.008" 51.0 mm 160.22mm
  2.047" 52.0 mm 163.36mm
2-1/16" 2.0625" 52.39 mm 6.480"
  2.087" 53.0 mm 166.50mm
2-1/8" 2.125" 53.98 mm 6.676"
  2.126" 54.0 mm 169.65mm
  2.165" 55.0 mm 172.79mm
2-3/16" 2.1875" 55.6 mm 6.872"
  2.205" 56.0 mm 175.93mm
  2.244" 57.0 mm 179.07mm
2-1/4" 2.250" 57.15 mm 7.069"
  2.283" 58.0 mm 182.21mm
2-5/16" 2.3125" 58.74 mm 7.265"
  2.323" 59.0 mm 185.35mm
  2.362" 60.0 mm 188.50mm
2-3/8" 2.375" 60.33 mm 7.461"
  2.402" 61.0 mm 191.64mm
2-7/16" 2.4375" 61.91 mm 7.658"
  2.441" 62.0 mm 194.78mm
  2.480" 63.0 mm 197.92mm
2-1/2" 2.500" 63.5 mm 7.854"
  2.520" 64.0 mm 201.06mm
  2.559" 65.0 mm 204.20mm
2-9/16" 2.5625" 65.09 mm 8.050"
  2.598" 66.0 mm 207.35mm
2-5/8" 2.625" 66.68 mm 8.247"
  2.638" 67.0 mm 210.49mm
  2.677" 68.0 mm 213.63mm
2-11/16" 2.6875" 68.26 mm 8.443"
  2.717" 69.0 mm 216.77mm
2-3/4" 2.750" 69.85 mm 8.639"
  2.756" 70.0 mm 219.91mm
  2.795" 71.0 mm 223.05mm
2-13/16" 2.8125" 71.44 mm 8.836"
  2.835" 72.0 mm 226.19mm
  2.874" 73.0 mm 229.34mm
2-7/8" 2.875" 73.03 mm 9.032"
  2.913" 74.0 mm 232.48mm
2-15/16" 2.9375" 74.61 mm 9.228"
  2.953" 75.0 mm 235.62mm
  2.992" 76.0 mm 238.76mm
3" 3.000" 76.2 mm 9.425" (3π)
Gauge or Fractional Inches
Decimal inches
Metric (mm)
Circumference
(Radius x 2π) aka
(Diameter x π)

*American standard brown and sharps wire gauge gage wheel*

This is a gauge wheel
that is used by body piercers and body jewelry manufacturers
to check the thickness of body jewelry up to 0ga. Dial calipers are often used above this size.
Gauge is sometimes spelled gage, or misspelled guage, and is abbreviated as 'ga.'

Body jewelry in the US is made using the Brown and Sharp (Brown and Sharpe) Wire Gauge system.
This is also known as the American Wire Gauge (AWG) system.
This system is based on two assumptions, that 36ga is .005" and that 0000ga is 0.4600" in diameter.
The diameter of each gauge is 0.890525 times the diameter of the previous size,
if counting backwards from 0000ga, or
1.1229331 times the previous size, if counting forwards from 36ga.

The gauge system came into play when people such as Jim Ward (who later founded The Gauntlet) began making body jewelry out of gold wire back in the 1970's, which uses the gauge system.
For better or for worse, it stuck!

Keep scrolling down for information on image sizes,
and to compare how your monitor displays them.

*conversion chart*

Here is a chart Erica made that converts from gauge to fractional inches, decimal inches, and millimeters.
You may also download this chart as a 150dpi .pdf file (210k) for personal use.

  • Diameter is the measurement used in a similar way as when referring to the size of a body piercing, for example: 0ga aka zero gauge, >5/16", or 8.25mm. Diameter is measured at the part of the jewelry where it would normally be worn, for example, the smaller part on a saddle shaped plug (NOT the flare), the larger end of a taper, a bit back from the tip, or the largest measurement on a curved shape (for example, a spiral) that can be used. This is sometimes referred to as the 'wearing surface.' All of the diameters mentioned on our website are measured on the wearing surface of the jewelry.
  • Sizes listed are diameters, measured at the wearing surface (the part of the jewelry where it would traditionally be worn).
  • The gauge system is a way of measuring diameters and only goes up to around 7/16", beyond that, we use fractional inches. Gauge is abbreviated 'ga'. Gauge is a unit of measurement. To increase the size of a body piercing is called 'stretching.' Calling plugs 'gauges' or using it as a verb as in 'to gauge a piercing' or 'she gauged her ears' will cause us to mock you. You wouldn't say, 'she just got new wooden inches' or 'I plan to millimeter my conch piercing,' would you? No, you wouldn't. So cut it out.
  • Length refers to the measurement from front to back on a plug or labret, or from side to side on a septum; length runs along the same axis a piercing needle would go through a piercing. All stated lengths are total from edge to edge (not merely tip to tip of flares, which would not allow for convex ends or thick flares). Please ask for various length measurements when clarification is needed.
  • Flare sizes and lengths (overall, or tip-to-tip on flared plugs which may have convex ends) are generally not mentioned unless dramatically differing from what we have experienced compared to similar jewelry in the same genre. Please have us measure these for you before purchasing jewelry from us if these measurements are critical to you.

  • We have all types of sizes, in fractional inches, gauges, and millimeters. Even decimal inches.
    We are fluent in all these different measuring systems and units, and will be happy to translate between them for you - or check out our conversion charts on this page!
  • We carry 'in-between' and odd sizes as well. Though we will have smaller sizes in the wires of metal ethnic jewelry and hair thin porcupine quills, our jewelry generally covers the whole range, including:
    16ga, 15ga, 14ga, 13ga, 12ga, 11ga, 10ga, 9ga, 8ga, 7ga, 6ga, 5ga, 4ga, 3ga, 2ga, 1ga, 0ga, 00ga,
    7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1",
    1-1/16", 1-1/8", 1-3/16", 1-1/4", 1-5/16", 1-3/8", 1-7/16", 1-1/2", and beyond.
    It's not unusual for some jewelry to measure in between sizes, for example: 'greater than 4ga but less than 3ga' (aka >4ga but <3ga), '±0ga,' '<7/16",' '13.5mm,' or even 'between 1/2" and 9/16".'
  • We are happy to find jewelry for you that is odd-sized, in-between sizes, or even one a bit bigger than another. We can even make custom wood or bamboo plugs in 'weird' sizes.
  • The symbol '>' means greater than. A bit bigger than.
  • The symbol '<' means less than. Just think: it looks like an L. Not so hard to remember! <L<Less than.
  • Greater than (>) or less than (<) refers to a bit, a hair, a smidge, roughly up to 1/64" or so off.
    For example, >1/2" means greater than half inch, roughly 33/64" (since 1/2" dead on is equal to 32/64").
  • The symbols '> or =' (≥) mean greater than or equal to. It's really darn close, but ever so slightly on the big side. It could also mean one piece is right on, but the other piece is greater than (>) that measurement.
  • Vice versa for '< or =' (≤)... these symbols mean less than or equal to.
  • The symbol '±' means plus or minus. One piece is a bit above, and one piece is a bit below that measurement.
  • Erica despises the terms 'triple ought' (000ga) or even 0000ga, so don't even go there.

00ga is the most misunderstood, misinterpreted, and badly converted of all of the measurements frequently used to measure body piercing jewelry. The proper conversion for 00ga is 9.266mm.
It is bigger than 9mm, but less than both 9.5mm and 10mm, and it is not quite 3/8" (0.375" or 9.53mm).

Also, most vendors only manufacture jewelry in,
and thus most people tend to stretch their body piercings by,
only the even-sized gauge increments.
Thus, most people jump up two gauge sizes per stretch, for example, from 8ga to 6ga, skipping 7ga.
However, 00ga in not a jump of two gauge size increments, it is only one, like an odd-sized gauge wood be.
Therefore, the jump from 0ga to 00ga is only half the 'normal' sized jump when stretching, and the most mellow increment in normal use.

We frequently get asked the question: what size comes after 00ga?
Gauge sizes are not normally used beyond 00ga for measuring body piercing jewelry,
thus, the next size jump up past 00ga is generally agreed to be 7/16".
Those stretching beyond that usually use fractional inches to describe the size of their body piercings.

Remember, the body does not stretch in gauges, only the mind does!

Circumference increases proportionately in relationship to the diameter (or radius). Shown.
Circumference is the measurement that would result from taking a string or thin strip of paper and wrapping it around the wearing surface of a plug or the hole of a piercing and then measuring this string or paper when it is then opened flat and straight, or for example by using a flexible measuring tape around a plug.
Divide by π (aka pi aka 3.14) to get the equivalent diameter of what you are measuring.
Circumference is useful for figuring out sizes of oval, teardrop, or other oddly-shaped plugs,
and it may help you to understand why certain stretches seem like bigger jumps than others.
Circumference is also a starting point in determining surface area
(for example: how much of a piercing is contacting the wearing surface of an earplug, or
the length of metal needed to making the wearing surface of a plug with sheet metal),
and by helping you to visualize how different gauges or other measurements compare.
Each 1/16" jump in diameter results in a .196" to .197" (.19635" to be exact)
jump in (aka added onto) the circumference.
Example: a plug 4X as big as another plug has a circumference 4X bigger.

Area increases as the square of the radius. Not shown.
Example: if a radius is 4X as big as another, it's area is 16X bigger (4²).
Example: a 7/8" plug has 4X more area than a 7/16" plug.
Example: if a plug is 2X as big in diameter, it has 4X the area (2²).
Example: a plug that is 1/2" has 4X less area than something that is 1".

You may not care about circumference, so you can choose to ignore that whole right-hand column.

Almost all of our images are scanned and shown at 100percent on this website and in the catalog; exceptions will be noted in the accompanying text. Monitors may alter sizes slightly. All of our images are posted at 72dpi (so monitors should assume this scale in order to display at proper size). Images should print at correct size as long as an 'enlarge' or a 'reduce to fit' setting has not been selected.

ruler millimeters inches mm in

For a comparison check to see if your monitor is reducing or blowing up image sizes,
hold your own ruler up to the image above, centering it on the 3" or 23cm mark.

world coins monitor size enlarge reduce

Alternatively, match up a coin from your collection!
These are uploaded at 100percent exactly like all our other images
(hint to those in my country of birth: spot the Oregon quarter on the 2nd row, 5th over).

Here are some conversions for US coins:
Penny 2.500 grams (.750" aka 19.05mm) 3/4" exactly
Nickel 5.000 grams (.835" aka 21.21mm) between 13/16" and 7/8" (closer to 13/16")
Dime 2.268 grams (.705" aka 17.91mm) just over 11/16"
Quarter 5.670 grams (.955" aka 24.26mm) between 15/16" and 1" (closer to 15/16")
Sacagawea $1 coin 8.1grams (1.043" aka 26.49mm) between 1" and 1-1/16" (closer to 1-1/16")

Thumbnails may be shown for larger items; the border around the image will be a different color and the text will mention to click the image to view one at full size. Likewise, in a few cases enlarged images are posted to show detail. T-shirt designs, o-ring kits, Dayak patch and wallhangings, photographs of people, posters, book and magazine covers, as well as square thumbnail-sized icons to aid in navigating around pages on this site are shown at a reduced size only.



:: All prices listed are wholesale to shops :: Retail prices to individuals are twice those listed ::

Home | Download Catalog | Newly Acquired Jewelry |
Amber | Bamboo | Horn and Bone | Stone | Hardwood | New Silver and Bronze | Ethnic Jewelry |
Labrets and Septums | Bracelets | Other Goodies | Twilight | Photo Gallery | Links and Books |
Ordering Information | Size | Care Instructions | Material Information | About Us | Contact Organic

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:: Website created by Erica Skadsen on 1 July 1997 ::
© Organic LLC 1997-2013



*red dayak flower*