Tool description

The Ring Size Converter helps you convert ring sizes between different sizing systems used around the world, including ring size conversion mm measurements. Whether you need to know what ring size 7 in mm is, convert ring size 8 in UK, or find out what ring size P in US equals, this tool provides accurate conversions. As a comprehensive ring size guide US to UK and beyond, it eliminates confusion when shopping internationally or working with different measurement systems. This US to UK ring size converter supports six major sizing standards used by jewelry retailers worldwide.

Features

  • Six Sizing Systems: Convert between US/Canada, UK/Australia, European (EU), Japan, diameter (mm), and circumference (mm)
  • Comprehensive Size Range: Supports sizes from US 3 to 13 (and equivalent sizes in other systems)
  • Bidirectional Conversion: Convert from any system to any other system
  • Instant Results: Real-time conversion as you type or select
  • Accurate Mapping: Based on international standard ring size charts
  • Metric Measurements: Includes both diameter and circumference in millimeters for precise measurements

Use Cases

  • International Shopping: Convert ring sizes when buying from international online retailers (e.g., converting US size 7 to UK or European sizes)
  • Jewelry Gifts: Find the correct ring size for someone who knows their size in a different system (such as UK ring size P to US equivalent)
  • Travel Purchases: Convert your home ring size to local sizing when shopping abroad using this US to UK ring size converter
  • Jewelry Making: Use precise ring size conversion mm measurements for custom ring creation
  • Ring Resizing: Communicate accurate diameter measurements in mm with jewelers across different countries
  • Size Verification: Double-check conversions like ring size 8 in UK before making important purchases

Supported Sizes

The converter includes ring sizes from US 3 to US 13, covering the most common ring sizes. For example, ring size 7 in mm equals 17.3mm diameter (54.4mm circumference), and ring size 8 converts to UK size P 1/2.

US/Canada Sizes: 3, 3.25, 3.5, 3.75, 4, 4.25, 4.5, 4.75, 5, 5.25, 5.5, 5.75, 6, 6.25, 6.5, 6.75, 7, 7.25, 7.5, 7.75, 8, 8.25, 8.5, 8.75, 9, 9.25, 9.5, 9.75, 10, 10.25, 10.5, 10.75, 11, 11.25, 11.5, 11.75, 12, 12.25, 12.5, 12.75, 13

UK/Australia Sizes: F through Z+1, with half sizes (ring size P in US is approximately 7.75-8)

European (EU) Sizes: 44 through 64, with half sizes

Japan Sizes: 4 through 27

Diameter Range: 14.0mm to 20.4mm for precise ring size conversion mm

Circumference Range: 44.0mm to 64.1mm

What is Ring Sizing?

Ring sizes are measurements that indicate the circumference or diameter of the inside of a ring. Different countries have developed their own sizing systems, which is why a ring size guide US to UK is essential for international shopping:

  • US/Canada System: Uses whole and quarter sizes (e.g., 7, 7.25, 7.5). For reference, ring size 7 in mm is 17.3mm diameter
  • UK/Australia System: Uses letters with half sizes (e.g., N, N 1/2, O, P). Using a US to UK ring size converter, you'll find ring size P in US is approximately 7.75-8
  • European System: Uses numbers representing circumference in millimeters (e.g., 52, 52.5) for direct ring size conversion mm
  • Japan System: Uses sequential numbers
  • Metric Systems: Direct measurements of diameter or circumference in millimeters (e.g., ring size 8 in UK is P 1/2, which equals 18.2mm diameter)

The most accurate way to determine ring size is by measuring the inner diameter or circumference in millimeters, which is why this converter includes both metric ring size conversion mm measurements alongside regional sizing systems like the US to UK ring size converter functionality.