Wrongduck Ring Sizing Kit (US Only)
Pairs well with
Size chart
WRONGDUCK SIZE GUIDE
Find your best ring size
Click Find My Size to measure online in a few simple steps. You’ll get your recommended Wrongduck ring size instantly—no chart matching needed.
Wrongduck ring size chart
Choose the store size that matches your measured diameter or circumference.
| Store size | Diameter | Circumference | ISO / EU | UK |
|---|---|---|---|---|
| 6 | 16.5 mm | 51.8 mm | 52 | L ½ |
| 7 | 17.3 mm | 54.4 mm | 54 | N ½ |
| 8 | 18.1 mm | 56.9 mm | 57 | P ½ |
| 9 | 18.9 mm | 59.5 mm | 59 | R ½ |
| 10 | 19.7 mm | 62.0 mm | 62 | T ½ |
| 11 | 20.5 mm | 64.5 mm | 65 | V ½ |
| 12 | 21.4 mm | 67.1 mm | 67 | X ½ |
| 13 | 22.2 mm | 69.7 mm | 70 | Z1 |
| 14 | 23.0 mm | 72.2 mm | 72 | Z3 |
Between sizes? Choose the larger size for a more comfortable fit. Availability varies by ring model.
Measure with paper or thread
- Wrap a narrow strip of paper or non-stretch thread around the base of your finger.
- Keep it comfortably snug without squeezing your finger.
- Mark where the two ends meet.
- Lay it flat and measure the marked length in millimetres.
- Match that circumference to the chart above.
Measure at the end of the day when your hands are at a normal temperature, and repeat the measurement twice.
Shipping Information
Before the shipping,please allow us 1-2 business days for processing your order, timing depends on the actual situation.
Once your order has been shipped, we will immediately provide you with tracking information. Delivery times vary by region, Orders typically take 4-10 days to arrive.
How much is the subscription fee?
No subscription required. With a one-time purchase, you get full access to all health tracking features.
Package List
Smart Ring*1
Charging case *1
Charging cable *1
User manual *1
Wrongduck App Download
Looking for the correct app for your Wrongduck Smart Ring? Visit our Wrongduck App Download page, select your Smart Ring model, and download the compatible app for your device.
The Wrongduck Smart Ring Sizing Kit helps you find the perfect ring size before purchasing your smart ring. Available for U.S. customers only. Please note that the sizing kit is non-returnable.
A properly fitting smart ring provides the best possible comfort, performance, and overall user experience. Because Wrongduck smart ring sizes may differ slightly from standard ring sizes, we strongly recommend using our sizing kit before placing your order.
The smart ring can be worn on either hand and on any finger. For the most comfortable fit and optimal performance, we recommend wearing it on your index, middle, or ring finger.
What's Included:
- Full set of reusable sizing rings
- Easy-to-follow sizing instructions
Sizing Kit Credit Program:
The Smart Ring Sizing Kit is priced at $5.99. After purchasing the sizing kit, you will receive a $5.99 store credit added to the email address used for your order. This credit can be applied toward any future purchase on Wrongduck.com, including smart rings and other eligible products.
In other words, the cost of the sizing kit can be fully redeemed on your next order, helping you find the correct size with confidence while avoiding unnecessary exchanges or returns.
Important Sizing Notes:
- The sizing rings are made from lightweight plastic and may feel slightly more flexible than the actual metal smart ring.
- For the best fit, the sizing ring should feel secure and comfortable without causing discomfort.
- If a sizing ring feels extremely tight or difficult to remove, we recommend selecting the next larger size.
- If you are between two sizes, choosing the slightly looser option is often recommended, as the final smart ring has a more rigid metal construction and may fit differently than the plastic sizing ring.
- Finger size can vary throughout the day due to temperature, activity level, and other factors. For best results, test the sizing ring for several hours before making your final decision.
If a sizing ring feels perfectly snug but not tight, that is usually the ideal size for your smart ring.
Wrongduck Ring Sizing Kit (US Only)
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
-
14 day return policy
We have a 14-day return policy, which means you have 14 days after receiving your item to request a return.
For details, please see: Return Policy -
Shipping Information
Processing Time:
- Before the shipping,please allow us 1-2 business days for processing your order, timing depends on the actual situation(Public Holidays/Weekends excluded)
Shipping Time（Estimate）:
- Standard Shipping Fee: $5.99 per order.
- Free Shipping: Orders over $49.99.
- Delivery times vary by destination:
- Europe: 4-9 business days
- United States: 5-8 business days
- Australia & Canada: 5-10 business days
- Other Regions: 4-12 business days
For details, please see: Shipping policy
Well the kit is great it’s me that is the problem because even with the kit and instructions I got the wrong size. How do i know it’s the wrong size because I made a gist looked fine but when driving I could see a big space do I need a size smaller. Plus my steps on my iphone health app are much more. I think it needs to be snug but not so snug it’s difficult to remove.
It was very easy to find my size with this kit. If I would have used the string method I would have guess the wrong size