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💍 Ring Size Converter

Convert ring sizes between US, UK, and EU scales and view the matching inner diameter and circumference in millimetres.

International Ring Size Converter

Convert between US, UK, and EU ring sizes, and see the inner diameter and circumference in millimetres. Pick the system you know to view all equivalent measurements.

Known size systemSelect size

Ring size equivalents

US4
UKH
EU46.5
Inner diameter (mm)14.9
Circumference (mm)46.8

How to use this tool

Choose the sizing system you already know, then pick the size from the dropdown.
Compare equivalent values across US, UK, EU, and metric measurements in the results list.
Copy or download the conversion to share with clients, jewelers, or ecommerce teams.

Jewellery team uses

Assist international customers by translating their local size into your store’s standard.
Create printable cheat sheets for in-store fittings or remote consultations.
Reduce returns by double-checking orders that list both circumference and regional sizing.

Measurement tips

Measure fingers at the end of the day when they’re slightly larger for a comfortable fit.
Cold temperatures shrink fingers—add a half size if you’re unsure.
When converting from circumference, measure the inside of an existing ring for best accuracy.

FAQ

How precise are the conversions?: Values align with widely accepted international charts, but individual brands may differ slightly.
Can I add more regions?: Extend the RING_DATA table with additional systems (e.g., Japan) and labels to customize the tool.
What if the exact size isn’t listed?: Choose the closest measurement and consult a jeweler for bespoke sizing or half-step adjustments.

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