Ring & Jewellery Size Conversion
Every ring size conversion across US, UK, EU/ISO, Japan, plus inner circumference and diameter in millimetres — anchored to circumference, the measurement that doesn't change between countries.
Ring Size Converter
Type any size or a mm measurement, get every system at once.
Open converter →44.2 mm Ring Size
44.2 mm circumference = US 3 / EU 44.
View chart →45.5 mm Ring Size
45.5 mm circumference = US 3.5 / EU 46.
View chart →46.8 mm Ring Size
46.8 mm circumference = US 4 / EU 47.
View chart →48.0 mm Ring Size
48.0 mm circumference = US 4.5 / EU 48.
View chart →49.3 mm Ring Size
49.3 mm circumference = US 5 / EU 49.
View chart →50.6 mm Ring Size
50.6 mm circumference = US 5.5 / EU 51.
View chart →51.9 mm Ring Size
51.9 mm circumference = US 6 / EU 52.
View chart →53.1 mm Ring Size
53.1 mm circumference = US 6.5 / EU 53.
View chart →54.4 mm Ring Size
54.4 mm circumference = US 7 / EU 54.
View chart →55.7 mm Ring Size
55.7 mm circumference = US 7.5 / EU 56.
View chart →57.0 mm Ring Size
57.0 mm circumference = US 8 / EU 57.
View chart →58.3 mm Ring Size
58.3 mm circumference = US 8.5 / EU 58.
View chart →59.5 mm Ring Size
59.5 mm circumference = US 9 / EU 60.
View chart →60.8 mm Ring Size
60.8 mm circumference = US 9.5 / EU 61.
View chart →62.1 mm Ring Size
62.1 mm circumference = US 10 / EU 62.
View chart →63.4 mm Ring Size
63.4 mm circumference = US 10.5 / EU 63.
View chart →64.6 mm Ring Size
64.6 mm circumference = US 11 / EU 65.
View chart →65.9 mm Ring Size
65.9 mm circumference = US 11.5 / EU 66.
View chart →67.2 mm Ring Size
67.2 mm circumference = US 12 / EU 67.
View chart →68.5 mm Ring Size
68.5 mm circumference = US 12.5 / EU 68.
View chart →69.7 mm Ring Size
69.7 mm circumference = US 13 / EU 70.
View chart →EU 44 to US
EU 44 converts to US 3.
View chart →EU 46 to US
EU 46 converts to US 3.5.
View chart →EU 47 to US
EU 47 converts to US 4.
View chart →EU 48 to US
EU 48 converts to US 4.5.
View chart →EU 49 to US
EU 49 converts to US 5.
View chart →EU 51 to US
EU 51 converts to US 5.5.
View chart →EU 52 to US
EU 52 converts to US 6.
View chart →EU 53 to US
EU 53 converts to US 6.5.
View chart →EU 54 to US
EU 54 converts to US 7.
View chart →EU 56 to US
EU 56 converts to US 7.5.
View chart →EU 57 to US
EU 57 converts to US 8.
View chart →EU 58 to US
EU 58 converts to US 8.5.
View chart →EU 60 to US
EU 60 converts to US 9.
View chart →EU 61 to US
EU 61 converts to US 9.5.
View chart →EU 62 to US
EU 62 converts to US 10.
View chart →EU 63 to US
EU 63 converts to US 10.5.
View chart →EU 65 to US
EU 65 converts to US 11.
View chart →EU 66 to US
EU 66 converts to US 11.5.
View chart →EU 67 to US
EU 67 converts to US 12.
View chart →EU 68 to US
EU 68 converts to US 12.5.
View chart →EU 70 to US
EU 70 converts to US 13.
View chart →UK F to US
UK F converts to US 3.
View chart →UK G to US
UK G converts to US 3.5.
View chart →UK H½ to US
UK H½ converts to US 4.
View chart →UK I½ to US
UK I½ converts to US 4.5.
View chart →UK J½ to US
UK J½ converts to US 5.
View chart →UK K½ to US
UK K½ converts to US 5.5.
View chart →UK L½ to US
UK L½ converts to US 6.
View chart →UK M½ to US
UK M½ converts to US 6.5.
View chart →UK N½ to US
UK N½ converts to US 7.
View chart →UK O½ to US
UK O½ converts to US 7.5.
View chart →UK P½ to US
UK P½ converts to US 8.
View chart →UK Q½ to US
UK Q½ converts to US 8.5.
View chart →UK R½ to US
UK R½ converts to US 9.
View chart →UK S½ to US
UK S½ converts to US 9.5.
View chart →UK T½ to US
UK T½ converts to US 10.
View chart →UK U½ to US
UK U½ converts to US 10.5.
View chart →UK V½ to US
UK V½ converts to US 11.
View chart →UK W½ to US
UK W½ converts to US 11.5.
View chart →UK X½ to US
UK X½ converts to US 12.
View chart →UK Y½ to US
UK Y½ converts to US 12.5.
View chart →UK Z½ to US
UK Z½ converts to US 13.
View chart →US 10 to EU
US 10 converts to EU 62.
View chart →US 10 to UK
US 10 converts to UK T½.
View chart →US 10.5 to EU
US 10.5 converts to EU 63.
View chart →US 10.5 to UK
US 10.5 converts to UK U½.
View chart →US 11 to EU
US 11 converts to EU 65.
View chart →US 11 to UK
US 11 converts to UK V½.
View chart →US 11.5 to EU
US 11.5 converts to EU 66.
View chart →US 11.5 to UK
US 11.5 converts to UK W½.
View chart →US 12 to EU
US 12 converts to EU 67.
View chart →US 12 to UK
US 12 converts to UK X½.
View chart →US 12.5 to EU
US 12.5 converts to EU 68.
View chart →US 12.5 to UK
US 12.5 converts to UK Y½.
View chart →US 13 to EU
US 13 converts to EU 70.
View chart →US 13 to UK
US 13 converts to UK Z½.
View chart →US 3 to EU
US 3 converts to EU 44.
View chart →US 3 to UK
US 3 converts to UK F.
View chart →US 3.5 to EU
US 3.5 converts to EU 46.
View chart →US 3.5 to UK
US 3.5 converts to UK G.
View chart →US 4 to EU
US 4 converts to EU 47.
View chart →US 4 to UK
US 4 converts to UK H½.
View chart →US 4.5 to EU
US 4.5 converts to EU 48.
View chart →US 4.5 to UK
US 4.5 converts to UK I½.
View chart →US 5 to EU
US 5 converts to EU 49.
View chart →US 5 to UK
US 5 converts to UK J½.
View chart →US 5.5 to EU
US 5.5 converts to EU 51.
View chart →US 5.5 to UK
US 5.5 converts to UK K½.
View chart →US 6 to EU
US 6 converts to EU 52.
View chart →US 6 to UK
US 6 converts to UK L½.
View chart →US 6.5 to EU
US 6.5 converts to EU 53.
View chart →US 6.5 to UK
US 6.5 converts to UK M½.
View chart →US 7 to EU
US 7 converts to EU 54.
View chart →US 7 to UK
US 7 converts to UK N½.
View chart →US 7.5 to EU
US 7.5 converts to EU 56.
View chart →US 7.5 to UK
US 7.5 converts to UK O½.
View chart →US 8 to EU
US 8 converts to EU 57.
View chart →US 8 to UK
US 8 converts to UK P½.
View chart →US 8.5 to EU
US 8.5 converts to EU 58.
View chart →US 8.5 to UK
US 8.5 converts to UK Q½.
View chart →US 9 to EU
US 9 converts to EU 60.
View chart →US 9 to UK
US 9 converts to UK R½.
View chart →US 9.5 to EU
US 9.5 converts to EU 61.
View chart →US 9.5 to UK
US 9.5 converts to UK S½.
View chart →