精确测出你的戒指尺寸 只需几秒
Ring Sizer 在会自动校准到你 iPhone 的屏幕上测量任何戒指或手指，可在六种国际尺寸体系之间换算，并在下单前让你看到戒指戴在自己手上的效果。
iPhone 和 iPad 免费使用 · 需 iOS 17.0 或更高版本 · 自动校准到你设备的 PPI
一款清楚知道自己画在什么屏幕上的戒指量尺
多数屏幕量尺都假定一个通用像素密度，在大部分手机上都会出错。Ring Sizer 先识别你的设备，然后才开始测量。
在屏幕上测量戒指
把戒指放在屏幕上并调整可变圆环，或使用两点轻点标出内侧两端，读数更精确。
没有戒指也能量手指
滑动屏幕上的量规，直到贴合手指根部为止。无需打印、无需绳线、无需直尺。
用相机免手动扫描
把相机对准戒指或手，让应用替你完成测量。
绘制之前就已完成校准
Ring Sizer 会识别设备型号，并根据该屏幕已知的每英寸像素值设定比例。你也可以用硬币或银行卡微调核对。
六种尺寸体系，离线也能用
在美国/加拿大、英国/澳大利亚、欧盟/ISO、日本、中国和俄罗斯之间换算，并以毫米查看直径与内周长。
看它戴在你自己手上
只需拍一次手部照片，即可用 AI 虚拟试戴体验图库中 30 多款戒指。
测量、换算、浏览与试戴
来自 App Store 页面的六个界面：测量工具、国际换算器、戒指图库和 AI 虚拟试戴。
戒指尺寸换算器
在美国、英国、欧盟/ISO、日本、中国和俄罗斯尺寸之间换算，并以毫米查看直径与内周长。
国际戒指尺寸对照表
与 Ring Sizer 应用内所用完全相同的换算数据，因此你测出的尺寸和在这里查到的尺寸永远一致。
| 美国 / CA | 英国 / AU | 欧盟 / ISO | 日本 | 中国 | 俄罗斯 | 直径 |
|---|---|---|---|---|---|---|
| 3 | F | 44.0 | 4 | 4 | 44.0 | 14.0 |
| 3.5 | G½ | 45.5 | 5 | 5 | 45.5 | 14.5 |
| 4 | H | 46.8 | 7 | 7 | 46.8 | 14.9 |
| 4.5 | I½ | 48.0 | 8 | 8 | 48.0 | 15.3 |
| 5 | J½ | 49.3 | 9 | 9 | 49.3 | 15.7 |
| 5.5 | K½ | 50.6 | 10 | 10 | 50.6 | 16.1 |
| 6 | L½ | 51.9 | 12 | 12 | 51.9 | 16.5 |
| 6.5 | M½ | 53.1 | 13 | 13 | 53.1 | 16.9 |
| 7 | N½ | 54.4 | 14 | 14 | 54.4 | 17.3 |
| 7.5 | O½ | 55.7 | 15 | 15 | 55.7 | 17.7 |
| 8 | P½ | 57.0 | 16 | 16 | 57.0 | 18.1 |
| 8.5 | Q½ | 58.3 | 17 | 17 | 58.3 | 18.6 |
| 9 | R½ | 59.5 | 18 | 18 | 59.5 | 18.9 |
| 9.5 | S½ | 60.8 | 19 | 19 | 60.8 | 19.4 |
| 10 | T½ | 62.1 | 20 | 20 | 62.1 | 19.8 |
| 10.5 | U½ | 63.4 | 22 | 22 | 63.4 | 20.2 |
| 11 | V½ | 64.6 | 23 | 23 | 64.6 | 20.6 |
| 11.5 | W½ | 65.9 | 24 | 24 | 65.9 | 21.0 |
| 12 | Y | 67.2 | 25 | 25 | 67.2 | 21.4 |
| 12.5 | Z | 68.5 | 26 | 26 | 68.5 | 21.8 |
| 13 | Z+1 | 69.7 | 27 | 27 | 69.7 | 22.2 |
戒指尺寸指南
十六篇分步指南，涵盖测出戒指尺寸的每一种方法，以及最容易出错的每一个环节。
How to measure your ring size at home
Five ways to measure ring size at home, ranked by accuracy, plus the calibration step that decides whether any of them actually works.
Read the guide指南Ring size chart for US, UK, EU, Japan, China and Russia
The complete international ring size chart with millimetre diameters and circumferences, plus how to read it and which column your seller actually means.
Read the guide指南Ring size converter
Convert ring sizes between US, UK, EU/ISO, Japanese, Chinese and Russian systems instantly, plus the millimetre diameter every jeweller can work from.
Read the guide指南How to measure ring size without a ring sizer
The string and paper methods explained properly, including the error each one introduces and the fix that makes a phone screen more accurate than either.
Read the guide指南How to find her ring size without her knowing
Eight ways to get an engagement ring size secretly, ranked by how accurate and how risky each one is, plus what to order when you still are not sure.
Read the guide指南How to measure ring size using a ring you already own
The most accurate at-home method: measure the inner diameter of a ring that fits. Here is how to do it on screen, on paper, and with a caliper.
Read the guide指南How to measure your finger for a ring size
Measure a finger accurately when you have no ring to copy: the on-screen gauge method, the knuckle test, and when to take the reading.
Read the guide指南Virtual ring try-on: see a ring on your own hand
How AI virtual try-on works, what it can and cannot tell you about a ring, and how to shoot a hand photo that produces a genuinely useful preview.
Read the guide指南Average ring size for women and men
The most common ring sizes for women and men, what the distribution looks like, and how to use an average safely when you cannot measure.
Read the guide指南mm to ring size: diameter and circumference converted
Turn a millimetre measurement into a ring size. Full diameter and circumference chart, plus how to tell which of the two your number actually is.
Read the guide指南Printable ring sizers, and why they so often print wrong
How to use a printable ring sizer without the scaling error that ruins most of them, plus the credit-card check that verifies any printed or on-screen scale.
Read the guide指南Men’s ring size chart and how to measure
The men’s ring size chart from US 8 to 13 with millimetres, why men’s bands usually need a size up, and how to measure a man’s finger properly.
Read the guide指南Wide band ring sizing: when to size up, and by how much
Wide bands fit tighter at the same size. Here is the adjustment table by band width, why it happens, and how comfort fit changes the answer.
Read the guide指南Ring sizing when your knuckle is bigger than your finger
Measure both the knuckle and the base, pick a size between the two, and stop the ring spinning. The complete fix for large-knuckle ring sizing.
Read the guide指南Engagement ring size guide
How to get an engagement ring size right when you only get one attempt: secret measuring, what to order if you cannot, and the resize questions to ask first.
Read the guide指南US to UK ring size conversion
Convert US ring size numbers to UK letters and back. Full chart from US 3 to 13, plus the half-letter rule that trips most conversions up.
Read the guide关于戒指、贴合度与尺寸的阅读
二十篇文章，讲述决定戒指是否合适的细节：时间、温度、指关节、改尺寸与网购。
The best time of day to measure your ring size
Your fingers change size by up to half a ring size between morning and night. Here is when to measure, and why the evening reading is the one to order against.
Read the articleAccuracyNine ring sizing mistakes that cost people a resize
The nine errors behind most badly fitting rings, from measuring the outside of a band to trusting an unscaled printout, and how to avoid each one.
Read the articleTechnologyHow screen calibration turns a phone into a real ring gauge
Why most on-screen ring sizers are wrong, what pixels-per-inch has to do with it, and how to verify any screen scale with a coin or a credit card.
Read the articleAccuracyString, paper, printout or app: every ring sizing method ranked
Six ways to measure a ring size compared on accuracy, cost and what each one actually gets wrong. The honest ranking, including where apps lose.
Read the articleConversionWhat ring size is 17 mm?
A 17 mm inner diameter is a US 6½. Here is the full decoder for every millimetre measurement between 14 and 23 mm, in every sizing system.
Read the articleProposalsA seven-day plan to get her ring size secretly
A day-by-day plan for finding an engagement ring size without giving anything away, with a fallback for each step that fails.
Read the article- Why the UK uses letters and Europe uses millimetres
- Can you resize a ring?
- Why your wedding band is not the same size as your engagement ring
- Cold hands, wrong size: how temperature changes ring fit
- How tight should a ring be?
- Ring size and pregnancy
- Does losing weight change your ring size?
- Buying a ring online: the sizing checklist
- Comfort fit vs standard fit: which size should you order?
- How to gift a ring when you cannot ask the size
- Your ring arrived and it does not fit. Now what?
- Ring size by hand shape and finger type
- How to photograph your hand for the best AI ring try-on
- Left hand vs right hand: why your ring sizes differ
关于戒指尺寸的常见疑问
如何在家测量戒指尺寸？
测量一枚已经合适的戒指的内径，再对照尺寸表：17.3 毫米对应美码 7。如果没有戒指，则测量手指根部的周长。无论哪种方式，都请在傍晚、手部温暖时测量，并确认所依据的刻度已经过校准。
戒指测量应用真的准确吗？
完全取决于校准。17.3 毫米的圆在 460 PPI 的 iPhone 上是 313 像素，在 326 PPI 上是 222 像素，因此假定单一通用密度的应用可能偏差好几个尺码。Ring Sizer 会识别机型并按已知 PPI 设定比例。测量你已有的戒指时，误差约为四分之一个尺码。
没有戒指量尺该怎么测？
用一条不会拉伸的纸条绕住手指根部，标出重叠处，再以毫米量出标记处的长度。这就是内周长，54.4 毫米对应美码 7。不要用绳线，因为它会拉伸，而两毫米的伸长几乎就是一个完整尺码。
平均戒指尺寸是多少？
女性平均为美码 6 至 7（直径 16.5 至 17.3 毫米），男性平均为美码 9 至 10（18.9 至 19.8 毫米）。售出的女士订婚戒指多在美码 5½ 至 7 之间。平均值适合用来核对测量是否合理，而不是用来代替测量。
怎样悄悄知道她的戒指尺寸？
借来一枚她已经戴在正确手指上的戒指，量它的内径。不到一分钟，而且这是唯一直接测量目标本身的方法。如果做不到，就把戒指放在银行卡旁边拍张照，或者问她身边那位守得住秘密的人。
我需要打印什么吗？
不需要。可打印的量尺只有在严格按 100% 比例输出时才有效，而打印机驱动经常在不作说明的情况下缩放到页面大小。2% 的比例误差大约相当于一个完整尺码。Ring Sizer 直接依据你的设备设定比例，因此无需打印，也无需核对。
一天中什么时候测最好？
傍晚，室温环境，手部温暖时。手指在清晨和受凉后最细，冰凉的手可能量出小一个整码的结果；一天结束时最粗。测三次，取最大的一次。
Ring Sizer 是免费的吗？
Ring Sizer 可在 App Store 免费下载，并包含可选的应用内购买。支持搭载 iOS 17.0 或更高版本的 iPhone、iPad 和 iPod touch。