Australia to US Ring Size

Enter an Australian letter size to find your US size equivalent, or use the reference chart below.

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

Common Australia to US equivalents

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

Australia J½ corresponds to US 5 at 15.7 mm.
Australia N½ corresponds to US 7 at 17.32 mm.
Australia R½ corresponds to US 9 at 18.95 mm.

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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.

Australian letter sizing vs. US numeric sizing

Australia, like the United Kingdom and New Zealand, uses the British letter-based ring sizing standard (A through Z+4). US jewelers use numbers (3 through 13.5). The most dependable way to convert between them is via inside diameter in millimeters. For example, Australian size L½ equals US size 6, Australian size N equals US size 6¾, and Australian size P equals US size 7¾.

Australia to US reference table

Australia to US ring size conversion
UK / AustraliaUK, IE, AU, NZ, ZA	US / CanadaUS, CA, MX	Diameter (mm)
UK / AustraliaUK, IE, AU, NZ, ZAF	US / CanadaUS, CA, MX3	Diameter (mm)14.07
UK / AustraliaUK, IE, AU, NZ, ZAG	US / CanadaUS, CA, MX3.5	Diameter (mm)14.48
UK / AustraliaUK, IE, AU, NZ, ZAH	US / CanadaUS, CA, MX4	Diameter (mm)14.88
UK / AustraliaUK, IE, AU, NZ, ZAI	US / CanadaUS, CA, MX4.5	Diameter (mm)15.29
UK / AustraliaUK, IE, AU, NZ, ZAJ½	US / CanadaUS, CA, MX5	Diameter (mm)15.7
UK / AustraliaUK, IE, AU, NZ, ZAK½	US / CanadaUS, CA, MX5.5	Diameter (mm)16.1
UK / AustraliaUK, IE, AU, NZ, ZAL½	US / CanadaUS, CA, MX6	Diameter (mm)16.51
UK / AustraliaUK, IE, AU, NZ, ZAM½	US / CanadaUS, CA, MX6.5	Diameter (mm)16.92
UK / AustraliaUK, IE, AU, NZ, ZAN½	US / CanadaUS, CA, MX7	Diameter (mm)17.32
UK / AustraliaUK, IE, AU, NZ, ZAO½	US / CanadaUS, CA, MX7.5	Diameter (mm)17.73
UK / AustraliaUK, IE, AU, NZ, ZAP½	US / CanadaUS, CA, MX8	Diameter (mm)18.14
UK / AustraliaUK, IE, AU, NZ, ZAQ¼	US / CanadaUS, CA, MX8.5	Diameter (mm)18.54
UK / AustraliaUK, IE, AU, NZ, ZAR½	US / CanadaUS, CA, MX9	Diameter (mm)18.95
UK / AustraliaUK, IE, AU, NZ, ZAS½	US / CanadaUS, CA, MX9.5	Diameter (mm)19.35
UK / AustraliaUK, IE, AU, NZ, ZAT½	US / CanadaUS, CA, MX10	Diameter (mm)19.76
UK / AustraliaUK, IE, AU, NZ, ZAU½	US / CanadaUS, CA, MX10.5	Diameter (mm)20.17
UK / AustraliaUK, IE, AU, NZ, ZAV½	US / CanadaUS, CA, MX11	Diameter (mm)20.57
UK / AustraliaUK, IE, AU, NZ, ZAW½	US / CanadaUS, CA, MX11.5	Diameter (mm)20.98
UK / AustraliaUK, IE, AU, NZ, ZAX½	US / CanadaUS, CA, MX12	Diameter (mm)21.39
UK / AustraliaUK, IE, AU, NZ, ZAY½	US / CanadaUS, CA, MX12.5	Diameter (mm)21.79
UK / AustraliaUK, IE, AU, NZ, ZAZ½	US / CanadaUS, CA, MX13	Diameter (mm)22.2