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RingSizeConvert.com

US to Australia Ring Size

Enter a US/Canada ring size to find your Australian letter size, or browse the complete reference table below.

Need to convert in reverse? Go to Australia to US Ring Size Converter →

Common US to Australia equivalents

These examples share the same inner diameter. Use the calculator for another size or an in-between measurement.

  • US 5 corresponds to Australia J½ at 15.7 mm.
  • US 7 corresponds to Australia N½ at 17.32 mm.
  • US 9 corresponds to Australia R½ at 18.95 mm.
How would you like to find your size?

Numeric size (e.g. 8) for US/Canada, EU, or Japan — or a letter size (e.g. P 1/2) for UK/Australia.

How to convert US numeric sizes to Australian letters

Australian jewelers use an alphabetical letter system (A through Z+4) where each letter indicates a specific inner circumference. When buying jewelry from the US or international online stores (such as Etsy, Blue Nile, or Brilliant Earth), use this conversion chart to map your US number directly to an Australian letter. For instance, US size 6 corresponds to Australian size L½, and US size 7 corresponds to Australian size N½.

US to Australia reference table

US to Australia ring size conversion
US / CanadaUS, CA, MXUK / AustraliaUK, IE, AU, NZ, ZADiameter (mm)
US / CanadaUS, CA, MX3UK / AustraliaUK, IE, AU, NZ, ZAFDiameter (mm)14.07
US / CanadaUS, CA, MX3.5UK / AustraliaUK, IE, AU, NZ, ZAGDiameter (mm)14.48
US / CanadaUS, CA, MX4UK / AustraliaUK, IE, AU, NZ, ZAHDiameter (mm)14.88
US / CanadaUS, CA, MX4.5UK / AustraliaUK, IE, AU, NZ, ZAIDiameter (mm)15.29
US / CanadaUS, CA, MX5UK / AustraliaUK, IE, AU, NZ, ZAJ½Diameter (mm)15.7
US / CanadaUS, CA, MX5.5UK / AustraliaUK, IE, AU, NZ, ZAK½Diameter (mm)16.1
US / CanadaUS, CA, MX6UK / AustraliaUK, IE, AU, NZ, ZAL½Diameter (mm)16.51
US / CanadaUS, CA, MX6.5UK / AustraliaUK, IE, AU, NZ, ZAM½Diameter (mm)16.92
US / CanadaUS, CA, MX7UK / AustraliaUK, IE, AU, NZ, ZAN½Diameter (mm)17.32
US / CanadaUS, CA, MX7.5UK / AustraliaUK, IE, AU, NZ, ZAO½Diameter (mm)17.73
US / CanadaUS, CA, MX8UK / AustraliaUK, IE, AU, NZ, ZAP½Diameter (mm)18.14
US / CanadaUS, CA, MX8.5UK / AustraliaUK, IE, AU, NZ, ZAQ¼Diameter (mm)18.54
US / CanadaUS, CA, MX9UK / AustraliaUK, IE, AU, NZ, ZAR½Diameter (mm)18.95
US / CanadaUS, CA, MX9.5UK / AustraliaUK, IE, AU, NZ, ZAS½Diameter (mm)19.35
US / CanadaUS, CA, MX10UK / AustraliaUK, IE, AU, NZ, ZAT½Diameter (mm)19.76
US / CanadaUS, CA, MX10.5UK / AustraliaUK, IE, AU, NZ, ZAU½Diameter (mm)20.17
US / CanadaUS, CA, MX11UK / AustraliaUK, IE, AU, NZ, ZAV½Diameter (mm)20.57
US / CanadaUS, CA, MX11.5UK / AustraliaUK, IE, AU, NZ, ZAW½Diameter (mm)20.98
US / CanadaUS, CA, MX12UK / AustraliaUK, IE, AU, NZ, ZAX½Diameter (mm)21.39
US / CanadaUS, CA, MX12.5UK / AustraliaUK, IE, AU, NZ, ZAY½Diameter (mm)21.79
US / CanadaUS, CA, MX13UK / AustraliaUK, IE, AU, NZ, ZAZ½Diameter (mm)22.2