EU ring size to US ring size
Useful when a local jeweller gave you an EU size and you want to order from a US store.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter eu size.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
US size = (EU size ÷ (π × 25.4) − 0.458) ÷ 0.032, rounded to the nearest quarter.
Example
Inputs: EU size = 54 mm. Result: US size: 6.75; Exact US size: 6.84; UK size: N.
Limits and caveats
- Sizes are rounded to the nearest step of each system, and shop mandrels can differ slightly.
Questions about this tool
What is EU 54 in US sizes?
About 6.84, which rounds to 6.75.
Is the EU size the same in France and Germany?
Yes, most of Europe uses the circumference in mm under ISO 8653.
I fall between two US sizes. Which one?
Take the larger one if your knuckles are wide or the band is wide.