UK to EU Ring Size

Enter a UK letter size to find its European EU/ISO equivalent, or check the complete reference chart.

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

Common UK to EU equivalents

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

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

UK letter scale vs. European millimeter circumference

UK ring sizes use letters (A through Z+4) while European sizes (per ISO 8653) are expressed in millimeters of inner circumference. A UK size L corresponds to EU 51, UK size N corresponds to EU 54, and UK size P corresponds to EU 56½.

UK to EU reference table

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