EU to UK Ring Size

Enter an EU size to find its UK/Australia equivalent, or scan the full reference table below.

Need to convert in reverse? Go to UK to EU Ring Size Converter →

Common EU to UK equivalents

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

EU 49.5 corresponds to UK J½ at 15.7 mm.
EU 54.5 corresponds to UK N½ at 17.32 mm.
EU 59.5 corresponds to UK R½ at 18.95 mm.

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

EU sizes use millimeters; UK sizes use letters

EU size labels represent the inner circumference in millimeters, while UK/Australia uses a letter-based scale. Because the labels describe different measurements, convert through the shared physical ring dimensions rather than trying to map the numbers and letters directly.

EU to UK reference table

EU to UK ring size conversion
EUEU, FR, AT, BE, DK, SE, NO, FI	UK / AustraliaUK, IE, AU, NZ, ZA	Diameter (mm)
EUEU, FR, AT, BE, DK, SE, NO, FI44	UK / AustraliaUK, IE, AU, NZ, ZAF	Diameter (mm)14.07
EUEU, FR, AT, BE, DK, SE, NO, FI45.5	UK / AustraliaUK, IE, AU, NZ, ZAG	Diameter (mm)14.48
EUEU, FR, AT, BE, DK, SE, NO, FI47	UK / AustraliaUK, IE, AU, NZ, ZAH	Diameter (mm)14.88
EUEU, FR, AT, BE, DK, SE, NO, FI48	UK / AustraliaUK, IE, AU, NZ, ZAI	Diameter (mm)15.29
EUEU, FR, AT, BE, DK, SE, NO, FI49.5	UK / AustraliaUK, IE, AU, NZ, ZAJ½	Diameter (mm)15.7
EUEU, FR, AT, BE, DK, SE, NO, FI50.5	UK / AustraliaUK, IE, AU, NZ, ZAK½	Diameter (mm)16.1
EUEU, FR, AT, BE, DK, SE, NO, FI52	UK / AustraliaUK, IE, AU, NZ, ZAL½	Diameter (mm)16.51
EUEU, FR, AT, BE, DK, SE, NO, FI53	UK / AustraliaUK, IE, AU, NZ, ZAM½	Diameter (mm)16.92
EUEU, FR, AT, BE, DK, SE, NO, FI54.5	UK / AustraliaUK, IE, AU, NZ, ZAN½	Diameter (mm)17.32
EUEU, FR, AT, BE, DK, SE, NO, FI55.5	UK / AustraliaUK, IE, AU, NZ, ZAO½	Diameter (mm)17.73
EUEU, FR, AT, BE, DK, SE, NO, FI57	UK / AustraliaUK, IE, AU, NZ, ZAP½	Diameter (mm)18.14
EUEU, FR, AT, BE, DK, SE, NO, FI58.5	UK / AustraliaUK, IE, AU, NZ, ZAQ¼	Diameter (mm)18.54
EUEU, FR, AT, BE, DK, SE, NO, FI59.5	UK / AustraliaUK, IE, AU, NZ, ZAR½	Diameter (mm)18.95
EUEU, FR, AT, BE, DK, SE, NO, FI61	UK / AustraliaUK, IE, AU, NZ, ZAS½	Diameter (mm)19.35
EUEU, FR, AT, BE, DK, SE, NO, FI62	UK / AustraliaUK, IE, AU, NZ, ZAT½	Diameter (mm)19.76
EUEU, FR, AT, BE, DK, SE, NO, FI63.5	UK / AustraliaUK, IE, AU, NZ, ZAU½	Diameter (mm)20.17
EUEU, FR, AT, BE, DK, SE, NO, FI64.5	UK / AustraliaUK, IE, AU, NZ, ZAV½	Diameter (mm)20.57
EUEU, FR, AT, BE, DK, SE, NO, FI66	UK / AustraliaUK, IE, AU, NZ, ZAW½	Diameter (mm)20.98
EUEU, FR, AT, BE, DK, SE, NO, FI67	UK / AustraliaUK, IE, AU, NZ, ZAX½	Diameter (mm)21.39
EUEU, FR, AT, BE, DK, SE, NO, FI68.5	UK / AustraliaUK, IE, AU, NZ, ZAY½	Diameter (mm)21.79
EUEU, FR, AT, BE, DK, SE, NO, FI69.5	UK / AustraliaUK, IE, AU, NZ, ZAZ½	Diameter (mm)22.2