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Ring Size Converter

Convert ring sizes across US, UK, EU, and Japanese standards with millimeter diameters. Buy a size 7 as EU 54 correctly — free, local, no signup.

100% Local Browser Native

How to Use the Ring Size Converter

1. Enter size and system

Current ring size standard.

2. Read conversions

All standards with diameters.

3. Confirm with measurement

Measure in mm before ordering.

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Frequently Asked Questions

US 7 in EU size?

EU 54 (17.3 mm diameter). Ring conversions run on inner diameter — measure an existing ring, not the finger alone.

Measure at home?

Wrap paper around the finger, mark overlap, measure flat in mm. Measure in the evening (fingers swell through the day) and size up for wide bands.

Do ring specs upload?

No — math runs locally in your browser. Nothing leaves your device.

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Last updated October 2026