免费戒指尺寸转换器
在美国、欧洲和英国戒指尺码之间转换，含内径参考。
Inner Diameter (mm)
14.9 mm
Circumference (mm)46.8 mm
EU Size (Approx)7
UK Size Index (Approx)13
公式
Ring Size Conversion
Ring sizes vary by country. The US system uses numbers (typically 3-16), while the UK uses letters and EU uses circumference in mm minus 40.
Approximate Formula
Diameter (mm) = 11.63 + (US Size - 3) x 0.814
Circumference = Diameter x pi
EU Size = Circumference - 40
Quick Reference
计算示例
Convert US size 7 to other systems.
- 01Diameter = 11.63 + (7-3) x 0.814 = 14.886 mm
- 02Wait, let me recalculate: 11.63 + 4 x 0.814 = 14.886 mm
- 03Circumference = 14.886 x pi = 46.76 mm
- 04EU size = 46.76 - 40 = ~7
常见问题
How do I measure my ring size?
Wrap a thin strip of paper around your finger, mark where it overlaps, and measure the length in mm. This is the circumference. Divide by pi for diameter, then use a size chart.
Do ring sizes differ by width?
Yes. Wider bands fit tighter, so you may need a half-size to full-size larger for bands wider than 6mm compared to standard 2-4mm bands.
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