Why Sizing Matters for Wholesale
Ring sizing is the number one cause of jewelry returns and customer dissatisfaction. For wholesalers supplying international markets, understanding size conversions is essential. This guide covers all major sizing systems and practical tips for getting it right.
International Ring Size Conversion
US sizes use numbers (3-13.5) with half sizes. UK/Australia uses letters (A-Z+). EU uses inner circumference in mm (44-72). Japan/HK uses numbers (1-27) but with different scaling than US. Always confirm which system your customer uses before ordering.
US to Common Conversions
US 5 = UK J = EU 49 = JP 9. US 6 = UK L = EU 52 = JP 12. US 7 = UK N = EU 54.5 = JP 14. US 8 = UK P = EU 57 = JP 16. US 9 = UK R = EU 59.5 = JP 18. US 10 = UK T = EU 62 = JP 20. These are the most commonly ordered sizes.
Inner Diameter and Circumference Reference
US 5: 15.7mm diameter / 49.3mm circumference. US 6: 16.5mm / 51.9mm. US 7: 17.3mm / 54.4mm. US 8: 18.1mm / 57.0mm. US 9: 18.9mm / 59.5mm. US 10: 19.8mm / 62.1mm. Use these for custom manufacturing and customer measurement guides.
Most Popular Sizes to Stock
For women's rings: US 6 (most common), 7, and 8 cover ~75% of customers. For men's rings: US 9, 10, and 11 are most popular. A safe wholesale distribution: 15% size 5-6, 45% size 7-8, 25% size 9, 15% size 10-11.
Sizing Tips for Retailers
Provide a printable ring sizer on your website. Recommend measuring at the end of the day when fingers are warmest. Measure the finger the ring will be worn on (dominant hand is slightly larger). Account for knuckle size — the ring must pass over the knuckle. Wider bands (6mm+) may require going up half a size.
Adjustable Rings: The Sizing Solution
For gift purchases and online sales where sizing is uncertain, adjustable and open-design rings eliminate the problem. They fit most sizes and reduce return rates significantly. Consider making adjustable styles 20-30% of your ring inventory.
Resizing Services
Holycome offers resizing for most ring styles. For wholesale customers, we can manufacture to specific size requirements. Include size charts in your packaging and marketing materials to reduce customer uncertainty.
Need rings in specific sizes? Contact our wholesale team for custom size orders.