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Belly Bar Length Guide - Establish your navel piercing size

How to establish your preferred length for belly jewellery.

The listed length (inches" or millimetres as shown above) refers to the distance between the balls. It is the length of the piercing shaft in fractional inches/millimeters and not the length of the full belly jewellery.

If you are unsure what size you are, measure a piece of navel jewellery that currently fits you correctly and assess which size shown below will best fit. TIP: Most professional belly piercings are done at the standard 10mm to 11mm lengths. If your piercing was done sometime ago your piercing may have shrunk to a smaller size over the years.

NOTE: When you are initially pierced, due to anticipated swelling, your piercer will most likely use a size 12mm bar. This is to allow space for your swollen skin during the healing time. Once this healing process settles down (typically within 6 months give or take) your navel ring size should most likely go back to a standard 10mm. If at any stage you are uncertain, pop in and ask your piercer, I'm sure they will be able to assist.

For non-standard size piercings, we have a collection of custom sizeable navel rings here.

Length Conversion (eg. 3/8" 10mm)


Millimeters Fractional Inches
6mm 1/4"
8mm (short length) 5/16"
10mm (standard sizes) 3/8"
11mm (standard sizes) 7/16"
12mm 1/2"
14mm 9/16"
16mm 5/8"

TummyToys® Size Guide

TummyToys Clasp Sizing
All TummyToys® Sleepers are 14g gauge (as below) and are 7/16" in length - 11mm is shown on the diagram (left).

Full radius of the clasp when closed is 13.5mm edge to edge.

Custom Clasp Sizes

Only the solid gold and solid platinum TummyToys® clasps can be down sized.

Clasps can be down-sized (maximum 3mm shorter) or increased in size, custom sizes are an additional $40 for each peice and is available for solid gold and solid platinum only.

NB: There are NO refunds once we resize any product.


Pregnancy / Maternity Belly Button Ring Size Information

As your belly grows, your navel piercing stretches. During this time, it is best to wear a flexible PTFE or Bio Flex belly ring to avoid irritation.

Tummy Toys pregnacy belly rings are a standard size 14 gauge - as per above sizing and are sold in the following lengths. Anything shorter is not recommended as you can optionally cut these belly rings to a smaller size anyway if they are far too long for your piercing. Our pregnancy belly rings are self threading and your purchase from The Belly Ring Shop will include instructions on how to do this. For threading assistance please feel free to contact us.

Length Duration Sizable?
14mm Up to 7 months Yes
19mm Up to full term Yes
20mm Up to full term Yes



Gauge - width of the shaft (eg. 14g)

Navel jewellery is measured by gauges. The higher the gauge the smaller the piercing. 14g is the standard size that fits most piercings. To go up to 12g (and wider) you will need to have your piercing stretched.

The majority of navel rings sold by Tummy Toys are sold in the standard 14g size unless otherwise specified. Tummy Toys have various sizes available in the UV Flex capitves range.

16g is actually a smaller piercing gauge then 14g. Often people who leave their piercing without jewellery for too long end up switching to a 16g as their piercing partially closes, however there are far less choices in belly button rings in a 16g so retaining your 14g piercing is much more beneficial.

Refer to the chart below for specific details.

Gauge Millimeter Inches
16g 1.2mm 3/64"
14g (standard) 1.6mm 1/16"
12g 2mm 5/64"
10g 2.4mm 3/32"
8g 3.2mm 1/8"
6g 4mm 5/32"
4g 5mm 3/16"
2g 6mm 1/4"
0g 8mm 5/16"
00g 9.5mm 3/8"
000g 10mm   

Ball Size Conversion Chart

All belly ring balls for sale at The Belly Ring Shop website fit 14g shafts, unless otherwise specified. See below for a selection of our 14g replacement belly ring balls or click here for the full collection of body jewellery parts.

Millimeters Fractional Inches
3 1/8
4 5/32
5 3/16
6 1/4
8 5/16
10 3/8


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