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💍 戒指尺寸计算器Ring Size Calculator
由戒指内径、手指周长或美码换算美国/加拿大、英国/澳洲、欧洲（ISO）戒指尺码。Convert ring inner diameter, finger circumference or US size to US/Canada, UK/Australia and European (ISO) ring sizes.
使用说明与常见问题How-to & FAQ
「戒指尺寸计算器」是什么？What is the Ring Size Calculator tool?
由戒指内径、手指周长或美码换算美国/加拿大、英国/澳洲、欧洲（ISO）戒指尺码。Convert ring inner diameter, finger circumference or US size to US/Canada, UK/Australia and European (ISO) ring sizes.
如何使用「戒指尺寸计算器」？How do I use the Ring Size Calculator tool?
在「戒指尺寸计算器」中，填写「已知」、「数值」等参数，结果会随输入实时计算并显示在下方。In the Ring Size Calculator: Fill in "Given", "Value"; results are recalculated instantly as you type.
换算依据是什么？What is the conversion based on?
美码按标准公式：内径(mm) = 11.63 + 0.8128 × 美码（每半码 0.4064 mm）；欧码/ISO 8653 用内周长毫米数；英码为字母码，与美码换算为近似值（美码 5 ≈ J½，每 1 美码约 2 个字母）。结果中的美码按 0.25 码四舍五入（常见尺码为整码和半码，部分品牌提供 1/4 码），英码按最接近的半码美码换算。不同品牌略有差异，最好实际试戴。US: inner diameter (mm) = 11.63 + 0.8128 × size. EU/ISO 8653 uses inner circumference in mm. UK letter sizes are approximate equivalents (US 5 ≈ J½, about two letters per US size). The US size shown is rounded to the nearest quarter size (whole and half sizes are standard; some brands offer quarters), and the UK letter uses the nearest half US size. Brands differ slightly, so try one on if you can.
「戒指尺寸计算器」免费吗？需要注册吗？Is the Ring Size Calculator free? Do I need an account?
「戒指尺寸计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Ring Size Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.