EU to US Ring Size

Enter an EU/ISO size to find its US/Canada equivalent, or check the reference table — essential when shopping US jewelry from Europe.

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

Common EU to US equivalents

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

EU 49.5 corresponds to US 5 at 15.7 mm.
EU 54.5 corresponds to US 7 at 17.32 mm.
EU 59.5 corresponds to US 9 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.

Converting European circumference sizes to US diameter numbers

European ring sizes (per ISO 8653) directly state the inside circumference of the ring in millimeters (e.g. EU size 52 means a 52 mm inside circumference). US/Canada sizes use an abstract numeric scale based on inner diameter. To convert EU sizes to US, match the millimeter circumference to the corresponding US diameter number. For example, EU size 52 corresponds to US size 6 (16.5 mm diameter), and EU size 54 corresponds to US size 6¾ (17.2 mm diameter).

EU to US reference table

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