Oura Ring Size Chart
Find Your Perfect Fit for Gen3 & Gen4
(with cm, mm, and Regional Guides)
Our world is getting smarter day by day, incredibly easing our lives in ways that were not even imaginable by anyone. From smart gadgets and wristwatches to home appliances, each newly launched technology keeps unfolding wonders. Similar is the case with the Oura Ring – your new health tracker!
To get your perfect fit, the Oura Ring size chart further eases your shopping experience whether you wish to buy:
- Gen3 Oura Ring (latest version, readily available)
- Gen4 Oura Ring (not launched or rumored yet)
Comprehending all the details of the Oura Ring size chart demands your undivided attention. We have presented elaborated calculations in millimeters (mm) and centimeters (cm) so you can effortlessly make the correct decision and find your perfect Oura Ring size.
Regardless of the country you reside in, you will not find any difficulty in the Oura Ring sizes mm or cm because the measurements (and even units) are according to what your state has used.
In addition, you can inquire about the facts and figures of the Oura Ring size chart through our consultants and compare insights from online communities as well.
So buckle up and track your health while running errands, cooking, shopping, sleeping – literally doing anything!
What is the Oura Ring and its Size?
As already mentioned, Oura Ring is a smart, health-tracking ring. It resembles the rings you wear on your fingers in your daily routine. This ring gives perfectly measured numeric and precise outcomes about several health aspects, such as your:
- Body temperature
- Heart rate
- Activity level
- Sleep cycle
The accuracy of the Oura Ring can be compromised if it feels too tight or too loose on your finger. Therefore, determining the perfect fit is mandatory. You will receive a free sizing kit before your order is shipped to your doorstep on every purchase.
To understand accurate sizing methods, you can learn more about how to measure ring size using simple at-home techniques.
Oura Ring Size Chart Overview (in mm and cm)
Oura Rings are available in US standard ring sizes 6-13. The internal diameter is measured in millimeters. But, global users must understand size in centimeters (cm) and compare it with regional sizing systems.
Here’s the general Oura Ring size chart in cm and mm:
| US Ring Size | Internal Diameter (mm) | Circumference (mm) | Approx. (cm) |
| 6 | 16.45 | 51.6 | 5.16 cm |
| 7 | 17.3 | 54.4 | 5.44 cm |
| 8 | 18.2 | 57.2 | 5.72 cm |
| 9 | 19.0 | 59.7 | 5.97 cm |
| 10 | 19.8 | 62.3 | 6.23 cm |
| 11 | 20.6 | 64.9 | 6.49 cm |
| 12 | 21.4 | 67.5 | 6.75 cm |
| 13 | 22.2 | 70.1 | 7.01 cm |
Oura Ring Size Chart Gen3 vs. Gen4
Gen3 and Gen4 look similar and use the same size scale. Nonetheless, the Oura Ring size chart Gen4 (if launched – or rumored) may offer negligible numeric or design changes. As of now, the size options remain consistent between generations. However:
Gen4 rumors suggest a more contoured inner band for improved sensor contact.
Sizing remains based on diameter. If you wore a size 8 for Gen3, you will likely choose the same size from Oura Ring Gen 4 size chart. Therefore, always use the latest sizing kit to double-check, especially when upgrading.
Oura Ring Sizing Tips for Women
The smaller end of the ring size spectrum – sizes 6 to 8 – is most common for women. Using women’s Oura Ring size chart is helpful. Besides, consider the following tips:
- Try the ring on your index finger for the best tracking.
- If you are between sizes, go with the slightly larger one.
- Temperature and time of day affect finger size. Test the sizing kit at different times to ensure comfort.
The sleek design of the Oura ring suits both men and women. However, women should pay extra attention to seasonal swelling or pregnancy-related size changes.
Oura Ring Size vs. Regular Ring Size
The Oura Ring sizes align with the US standards. However, there are a few distinctions:
- Regular rings may be worn on any finger, often looser for comfort.
- Oura Rings must fit snugly to allow health sensors to maintain skin contact.
- Even if you know your engagement ring size, you may need to adjust slightly for Oura. For example:
- A standard ring in size 7 might be slightly loose.
- However, an Oura Ring in size 7 is intended for a more secure fit.
That is why Oura does not allow you to skip the sizing kit. It ensures you get the most accurate fit required for biometric tracking.
Region-Based Guide: US, UK, and Australia Oura Ring Size Chart
Here’s how the Oura Ring sizes compare across global standards. You can use the US, Australia, or the UK Oura Ring size chart:
| US | UK | Australia | Internal Diameter (mm) |
| 6 | L 1/2 | L 1/2 | 16.45 |
| 7 | N 1/2 | N 1/2 | 17.3 |
| 8 | P 1/2 | P 1/2 | 18.2 |
| 9 | R 1/2 | R 1/2 | 19.0 |
| 10 | T 1/2 | T 1/2 | 19.8 |
| 11 | V 1/2 | V 1/2 | 20.6 |
| 12 | X 1/2 | X 1/2 | 21.4 |
| 13 | Z+1 | Z+1 | 22.2 |
You will still use the US sizing system when ordering from Australia or the UK. However, this chart will help you estimate your size before the kit arrives.
For better clarity on global sizing standards, read our guide on whether Oura ring size is standard across different countries
Best Buy Oura Ring Size vs Regular Ring Size
If you are buying from Best Buy, the process remains similar.
- Orders typically include the free sizing kit.
- You select your size after trying the sizing kit, not at checkout.
- Use the same Oura account to update your ring size before they ship your actual ring.
Pro Tip: Use Best Buy’s return window to your advantage if you feel uncertain about fit. Be sure not to open the final product packaging unless you are confident.
Reddit Insights: What Real Users Say About Sizing?
The Reddit Oura Ring size chart community is filled with helpful feedback on sizing. Some common insights are:
- “I’m normally a size 8, but I found the Oura Ring size 8 a bit snug in the summer.”
- “Try the kit on both hands and different fingers.”
- “Don’t guess your size. Use the kit even if you ‘know’ your ring size.”
Users also share tips, such as warming your hands before testing or tapping a sizing ring to simulate wearing it while sleeping.
How to Order the Right Size (With Oura’s Sizing Kit)?
- Order your ring (choose the color and style).
- Oura sends a complimentary sizing kit first.
- Wear test rings on the index fingers of both hands.
- Try them across the morning and evening.
- Log in to your Oura account to submit your final size.
- Your Oura Ring ships only after you confirm.
If you want to understand how sizing works in detail, explore how ring sizing works before finalizing your order.
FAQs: Oura Ring Size Chart
Conclusion: Getting the Perfect Fit
When it comes to smart rings, perfect fit guarantees accurate functioning. Whether you purchase Gen3 or the anticipated Gen4, the correct size ensures comfort and reliable data. This detailed guide to the Oura Ring size chart, including comparisons in mm, cm, and international sizes, and 3 vs 4 Oura Ring size chart will help you confidently choose.
Take the time to test with the sizing kit. Review regional guides, and listen to real users. Your health deserves nothing less than precision – and the perfect ring fit. You can also try our ring sizer online free tool for quick size checking.