Convert ring sizes between the US, UK/Australia, EU/France, Germany, Japan, Switzerland, India, Brazil and more โ with full mm diameter and circumference reference.
Every country uses a different ring sizing system โ a US Size 7 is a UK Size N, EU Size 54, Japanese Size 14, and German Size 17. When buying rings online from international retailers, or purchasing jewellery abroad, using this conversion chart prevents the most common sizing mistake: ordering in the wrong country's system.
Numeric system with quarter-size increments. Sizes typically range from 3 to 15. The most widely used system for online jewellery retail globally.
Women avg: 6ยพ ยท Men avg: 10Alphabetical system (AโZ and beyond with Z+1, Z+2 etc.). Used across UK, Australia, New Zealand and Ireland. Each letter = approx. 1.25 mm circumference.
Women avg: N ยท Men avg: TBased directly on the inner circumference in mm. EU Size 54 = 54 mm circumference. Also called the French or ISO standard. Simple and scientifically precise.
Women avg: 54 ยท Men avg: 62Based on the inner diameter in mm. German Size 17 = 17 mm diameter. Simple conversion: multiply by ฯ (3.14159) to get circumference.
Women avg: 17 ยท Men avg: 20Numeric system starting from 1, based on inner circumference. Used across East Asia. Japan Size 14 โ US 7 โ UK N. Sizes typically range from 1 to 30+.
Women avg: 13โ14 ยท Men avg: 20The Swiss system runs approximately 40 units behind the EU/French system. Swiss Size 14 โ EU Size 54. Not widely used outside Switzerland.
Women avg: 14 ยท Men avg: 22Uses a numeric system similar to but not identical to the US system. Indian sizes typically run slightly different โ Indian Size 16 โ US 7. Widely used across South Asia.
Women avg: 15โ16 ยท Men avg: 22Uses the same numeric system as the EU/French circumference standard, but written without the "mm" unit. Brazil Size 14 = EU 54 essentially identical to French sizes.
Same as EU / French systemMillimetres are the universal base measurement. Any size from any country can be converted to diameter or circumference in mm, then re-converted to any other system.
The single source of truthUses the same alphabetical system as the UK โ identical sizing. If you know your UK ring size, it is the same in South Africa with no conversion needed.
Identical to UK systemFind your size in any column, then read across the row to find the equivalent size in every other country's system. The Diameter (mm) and Circumference (mm) columns are the universal reference โ they work in any country. Highlighted rows โญ are the most commonly purchased sizes.
| Diam. (mm) |
Circ. (mm) |
๐บ๐ธ๐จ๐ฆUS / Canada |
๐ฌ๐ง๐ฆ๐บUK / AU / NZ |
๐ช๐บ๐ซ๐ทEU / France |
๐ฉ๐ช๐ฆ๐นGermany | ๐ฏ๐ต๐จ๐ณJapan / China |
๐จ๐ญSwitzer- land |
๐ฎ๐ณIndia | ๐ง๐ท๐ช๐ธBrazil / Spain |
|---|
Most commonly purchased ring sizes per country, with equivalents in other major systems.
Proportional diameter circles for popular women's and men's sizes. Always confirm with a ruler in mm.