How do I convert US ring size to UK ring size?

Use our free ring size converter tool. Simply select 'US' as your input system, enter your US ring size (e.g., 7), and the tool will automatically show you the equivalent UK size (e.g., N), European size, Japanese size, and diameter in millimeters.

What is the difference between US and European ring sizes?

US ring sizes use numbers (typically 3-15), while European ring sizes also use numbers but with a different scale (typically 37-77). For example, a US size 7 is equivalent to EU size 54. Our converter handles all conversions automatically between US, UK, EU, JP, and millimeter measurements.

How do I measure my ring size at home?

Wrap a string or paper strip around your finger at the base, mark where it overlaps, then measure the length in millimeters. Use our converter to find your ring size, or print our free printable ring sizer chart and match your finger to the correct size.

Is this ring size converter accurate?

Yes, our ring size converter uses industry-standard conversion tables and accurate diameter measurements. All conversions are based on official ring size standards for US, UK, European, and Japanese sizing systems.

Can I print a ring sizer?

Yes! Our tool includes a free printable ring sizer chart. Click the 'Print Ring Sizer' button to generate a printable SVG chart with accurate ring size measurements that you can use to measure your finger at home.

Ring Size Converter

Convert between US, UK, European, Japanese ring sizes and diameter measurements with precision

Printable Accurate Mobile Friendly

Ring Size Converter

Input Size

Size System

Size Value

Converted Sizes

Enter a size above to see conversions

Printable Ring Sizer

Get a physical ring size chart for accurate measurements

Ring Size Chart Preview (US Sizes)

How to Use

Measuring Your Ring Size

Use a string or paper strip
Wrap around finger at base
Mark where it overlaps
Measure length in millimeters
Use our converter to find your size

Size Systems

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US: Numeric (3-15, half sizes)

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UK: Letters (A-Z, incl. half sizes like F+, and Z+1 to Z+4)

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EU: Numeric (44-75, half sizes)

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JP: Numeric (1-30)

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mm: Diameter measurement