US to EU Ring Size Conversion

Enter a US/Canada size below to get its EU equivalent, or scan the full reference table — useful when shopping European jewelers.

How would you like to find your size?

I know my sizeConvert a size you already know to another sizing system.

I have a ringMeasure the inside of a ring that already fits well.

I measured my fingerUse a string, paper strip, or tape measurement.

Your size is in

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 EU ring sizes are defined

The EU/ISO size (per ISO 8653:2016) is defined as the inner circumference of the ring in millimeters, rounded to the nearest half-millimeter — so a EU size of 57 means an inner circumference of roughly 57mm. That's why EU numbers look much larger than US/Canada numbers for the same physical size: they're not on the same scale at all, they're a direct millimeter reading rather than an abstract size number. This makes EU sizes very precise once you know your millimeter measurement, which is exactly what the calculator above computes for you from a US/Canada size.

US/Canada to EU reference table

US/Canada to EU ring size conversion
US / CanadaUS, CA, MX	EUEU, FR, AT, BE, DK, SE, NO, FI	Diameter (mm)
US / CanadaUS, CA, MX3	EUEU, FR, AT, BE, DK, SE, NO, FI44	Diameter (mm)14.07
US / CanadaUS, CA, MX3.5	EUEU, FR, AT, BE, DK, SE, NO, FI45.5	Diameter (mm)14.48
US / CanadaUS, CA, MX4	EUEU, FR, AT, BE, DK, SE, NO, FI47	Diameter (mm)14.88
US / CanadaUS, CA, MX4.5	EUEU, FR, AT, BE, DK, SE, NO, FI48	Diameter (mm)15.29
US / CanadaUS, CA, MX5	EUEU, FR, AT, BE, DK, SE, NO, FI49.5	Diameter (mm)15.7
US / CanadaUS, CA, MX5.5	EUEU, FR, AT, BE, DK, SE, NO, FI50.5	Diameter (mm)16.1
US / CanadaUS, CA, MX6	EUEU, FR, AT, BE, DK, SE, NO, FI52	Diameter (mm)16.51
US / CanadaUS, CA, MX6.5	EUEU, FR, AT, BE, DK, SE, NO, FI53	Diameter (mm)16.92
US / CanadaUS, CA, MX7	EUEU, FR, AT, BE, DK, SE, NO, FI54.5	Diameter (mm)17.32
US / CanadaUS, CA, MX7.5	EUEU, FR, AT, BE, DK, SE, NO, FI55.5	Diameter (mm)17.73
US / CanadaUS, CA, MX8	EUEU, FR, AT, BE, DK, SE, NO, FI57	Diameter (mm)18.14
US / CanadaUS, CA, MX8.5	EUEU, FR, AT, BE, DK, SE, NO, FI58.5	Diameter (mm)18.54
US / CanadaUS, CA, MX9	EUEU, FR, AT, BE, DK, SE, NO, FI59.5	Diameter (mm)18.95
US / CanadaUS, CA, MX9.5	EUEU, FR, AT, BE, DK, SE, NO, FI61	Diameter (mm)19.35
US / CanadaUS, CA, MX10	EUEU, FR, AT, BE, DK, SE, NO, FI62	Diameter (mm)19.76
US / CanadaUS, CA, MX10.5	EUEU, FR, AT, BE, DK, SE, NO, FI63.5	Diameter (mm)20.17
US / CanadaUS, CA, MX11	EUEU, FR, AT, BE, DK, SE, NO, FI64.5	Diameter (mm)20.57
US / CanadaUS, CA, MX11.5	EUEU, FR, AT, BE, DK, SE, NO, FI66	Diameter (mm)20.98
US / CanadaUS, CA, MX12	EUEU, FR, AT, BE, DK, SE, NO, FI67	Diameter (mm)21.39
US / CanadaUS, CA, MX12.5	EUEU, FR, AT, BE, DK, SE, NO, FI68.5	Diameter (mm)21.79
US / CanadaUS, CA, MX13	EUEU, FR, AT, BE, DK, SE, NO, FI69.5	Diameter (mm)22.2