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Oura Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing - Receive Credit for Purchase

4.5 4.5 out of 5 stars 762 ratings

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Size: Sizing Kit
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Purchase options and add-ons

  • OURA RING 4 SIZING KIT - The Oura Ring 4 Sizing Kit is the ideal way to find the perfect size. It’s a custom sizer that allows for you, and those around you, to find the perfect fit before purchasing.
  • NOT STANDARD SIZING - Oura Ring 4 sizes are slightly different from standard ring sizes, so it is important to size yourself using our Oura Ring 4 sizing kit and to follow the instructions provided. Oura Ring 4 is available in sizes 4-15. There are no half sizes.
  • COMFORT AND ACCURACY - A properly fitting Oura Ring will result in the highest data accuracy, comfort, and overall experience.
  • CHOOSE A FINGER - Oura Ring 4 works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing your Oura Ring 4 on your index, middle, or ring finger. Size the exact finger you plan to wear your Oura Ring 4 on.
  • HOW IT SHOULD FIT - Oura Ring 4 should fit securely and comfortably at the base of your finger. Your ring should not rotate as you go about normal daily tasks. We recommend wearing your ring sizer for at least 24 hours to confirm your best fit.

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From the manufacturer

Oura The Revolutionary Smart Ring
Find the right fit

Find the right fit

Oura Ring 4 sizes are different than standard sizes. The Oura Ring 4 Sizing Kit is the best way to ensure a comfortable and accurate experience. With a purchase of the sizing kit, you'll receive a $10 Amazon credit towards your Oura Ring 4.

Size Before You Buy

Oura Ring 4 Sizing Kit

Step 1:

Purchase an Oura Ring 4 Sizing Kit and receive a $10 Amazon credit towards your Oura Ring 4.

Oura Ring 4

Step 2:

Purchase your Oura Ring 4, the $10 credit will be automatically applied at checkout.

Oura App

Step 3:

Slip on your Oura Ring 4 and download the Oura App.

Oura App

Step 4:

New members get the first month of Oura Membership free, then it’s $5.99 per month.

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.
Oura Ring 4 Sizing Kit Gift

A really smart gift.

The Oura Ring 4 Sizing Kit makes the perfect gift for your loved ones who want an Oura Ring 4 but you may not know their Oura Ring 4 size.


From the brand

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Product Description

The Oura Ring 4 Sizing Kit allows for you and those around you to find the ideal fit before purchasing. With a sizing kit purchase, a $10 credit will automatically be applied to your Oura Ring 4 at checkout. A properly fitting Oura Ring 4 will result in the highest possible data accuracy, comfort, and overall experience. Oura Ring 4 sizes are slightly different from standard ring sizes, so it is important to size yourself using our tools and to follow our sizing instructions. Oura Ring 4 works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing your Oura Ring 4 on your index, middle, or ring finger.

What's in the box

  • Oura Ring 4 Sizing Kit
  • Product information

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    Customer reviews

    4.5 out of 5 stars
    762 global ratings

    Review this product

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    Customers say

    Customers find the ring sizing kit accurate and useful for sizing rings. It includes plastic ring sizes that mimic the real Oura Ring Gen 4. Many find it helpful to try different sizes on different fingers before buying the actual ring. The kit is easy to use, with good instructions and an easy setup. They appreciate the ring size. However, opinions differ on comfort and bulkiness.

    AI-generated from the text of customer reviews

    57 customers mention "Sizing accuracy"40 positive17 negative

    Customers appreciate the sizing accuracy of the product. They find it easy to use and perfect for sizing for the Oura Gen4 ring. The kit includes a variety of plastic ring sizes that mimic the real Oura Ring Gen 4. It's nice to try different sizes on different fingers before deciding which expensive option to go with. Some say the plastic ring size kit is very helpful and identifying reading sizes for multiple family members. Overall, customers find the sizing kit a nice quality product.

    "...This kit helped my wife and I know the correct size to order." Read more

    "...The kit includes a variety of plastic ring sizes that mimic the real Oura Ring Gen 4, allowing you to wear them for a day or two to test comfort and..." Read more

    "...Because the Oura is bigger it may take a while to get used to it and you should do a variety of activities especially exercise to accurately assess..." Read more

    "I found this to be easy to use and perfect for sizing for my Oura gen4 ring...." Read more

    16 customers mention "Functionality"13 positive3 negative

    Customers appreciate the product's functionality. They find it simple, useful, and helpful for determining ring size before buying. Many consider it an essential tool to get started.

    "I used this to check my partners ring size and it worked great...." Read more

    "Very helpful! I originally ordered the wrong size of ring. This kit helped my wife and I know the correct size to order." Read more

    "...Overall, it’s a handy and necessary tool for ensuring you get the best fit, but a few small improvements could make it even better." Read more

    "Funny to review these But they worked just fine. Found our sizes and we're now part of the Oura family." Read more

    15 customers mention "Value for money"11 positive4 negative

    Customers like the value for money of the wireless accessory. They say it works well and is worth the money.

    "...Great value; I’d do it again!" Read more

    "...In our honest opinion we both feel this was money well spent. We have no regrets thus far." Read more

    "This is a nice quality ring size kit; however, charging $10 for it seemed unnecessary." Read more

    "Great product, much needed in order to buy the propper size. I thought I was one size but actually was another!" Read more

    9 customers mention "Ease of use"9 positive0 negative

    Customers find the wireless accessory easy to use and store. They appreciate the good instructions, simple setup, and user-friendly interface with the app. The samples are sturdy and easy to use and store, making it a great accessory.

    "I found this to be easy to use and perfect for sizing for my Oura gen4 ring...." Read more

    "...They were very easy after downloading the Oura App to our phones it was very easy to connect; just follow the directions in the App itself...." Read more

    "Helped size my ring, good instructions" Read more

    "These samples are sturdy and easy to use and store." Read more

    5 customers mention "Ring size"5 positive0 negative

    Customers find the ring sizer useful for sizing and determining what finger is best for their ring. They say it's accurate and a must-have to ensure you purchase the right size of Oura ring.

    "Perfect for sizing and deciding on what finger is best for your ring." Read more

    "The ring sizer is a great tool to ensure you purchase the right size Oura ring...." Read more

    "...Good kit, and really a requirement for the ring." Read more

    "...But these try on rings are wonderful. Can’t recommend enough to people who are in the market." Read more

    10 customers mention "Comfort"6 positive4 negative

    Customers have different opinions about the comfort of the wireless accessory. Some find it comfortable and wearable, saying they can wear them around the house for several days. Others find it bulky and uncomfortable, with the size 12 being tight on their fingers. The plastic rings feel slightly different from the actual ring.

    "...They’re comfortable to get on and come in a nice unassuming white color. The package is slim and not bulky...." Read more

    "...That said, the plastic rings feel slightly different from the actual ring in terms of weight and texture, which makes it a bit tricky to fully gauge..." Read more

    "...As long as you have the right size we both find them to be very comfortable...." Read more

    "...when I slept my fingers swelled a tiny bit, making it a bit uncomfortable and hard to remove...." Read more

    6 customers mention "Bulkiness"2 positive4 negative

    Customers have different views on the bulkiness of the product. Some find it slim and not bulky, while others say the ring itself is bulky and heavy. The sizing kit rings are thicker than the actual Oura ring, and it's larger and thicker than a typical wedding band.

    "...The Oura is a little bigger and thicker than a typical wedding band so you must wear for a few days to make sure it fits and you like wearing it on..." Read more

    "...The package is slim and not bulky. It doesn’t have a battery or anything, so just note this is just a sizing kit. Great value; I’d do it again!" Read more

    "...The real ring which I ordered felt very bulky, heavy, and sharp-edged on my finger, to the extent that even after a few days of wearing it, I could..." Read more

    "It’s a ring sizing kit so you can’t really mess that up. The sizing kit rings are thicker than the actual Oura ring...." Read more

    Solid Oura Sizing Kit
    5 out of 5 stars
    Solid Oura Sizing Kit
    Highly recommend purchasing the sizing kit before ordering an Oura ring to ensure you receive the correct size for the finger you choose to wear it on. When my ring arrived, it fit just like the size I chose in the kit. Priced appropriately for the product.
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    Top reviews from the United States

    • Reviewed in the United States on December 6, 2024
      Size: Sizing KitVerified Purchase
      If you are thinking of buying an Oura ring to monitor your health and fitness you MUST get this kit first. Oura ring sizes ARE NOT the same as regular rings. This kit comes with a wide selection of sizes. Try them on and wear for a few days. The Oura is a little bigger and thicker than a typical wedding band so you must wear for a few days to make sure it fits and you like wearing it on the finger you have chosen.

      Because the Oura is bigger it may take a while to get used to it and you should do a variety of activities especially exercise to accurately assess the size. For example, when I go on a long hike my fingers swell a bit and the ring size I initially tried was too tight. One thing to keep in mind though is that if you plan to loose weight, your fingers might get less fat and the ring size may change, so plan accordingly. (You can always change to a smaller finger or thumb as you wear the ring.
      12 people found this helpful
      Report
    • Reviewed in the United States on December 15, 2024
      Size: Sizing KitVerified Purchase
      I used this to check my partners ring size and it worked great. I acted like I just wanted to “see if these Oura rings” fit and she was none-the-wiser. They’re comfortable to get on and come in a nice unassuming white color. The package is slim and not bulky. It doesn’t have a battery or anything, so just note this is just a sizing kit. Great value; I’d do it again!
      5 people found this helpful
      Report
    • Reviewed in the United States on February 9, 2025
      Size: Sizing KitVerified Purchase
      Very helpful! I originally ordered the wrong size of ring. This kit helped my wife and I know the correct size to order.
      One person found this helpful
      Report
    • Reviewed in the United States on January 30, 2025
      Size: Sizing KitVerified Purchase
      The Oura Ring 4 Sizing Kit is a useful tool for finding the right fit before committing to the actual ring. The kit includes a variety of plastic ring sizes that mimic the real Oura Ring Gen 4, allowing you to wear them for a day or two to test comfort and fit. This is especially helpful since the Oura Ring isn’t resizable, so getting the right size upfront is important.

      That said, the plastic rings feel slightly different from the actual ring in terms of weight and texture, which makes it a bit tricky to fully gauge how the real one will feel over time. Also, I wish the sizing kit were refundable or came with a discount toward the final purchase since it’s a one-time-use item.

      Overall, it’s a handy and necessary tool for ensuring you get the best fit, but a few small improvements could make it even better.
      One person found this helpful
      Report
    • Reviewed in the United States on February 15, 2025
      Size: Sizing KitVerified Purchase
      UPDATED: Sorry the below REVIEW is for the two OURA RING 4 rings that I purchased and enjoy. The kit was purchased first so that we had correct sizing for purchasing the rings. This worked out well especially because once I purchased the rings I received the cost of the kit off of the price of the ring.
      Purchased two of these and we’ve been wearing them for about two weeks now. As long as you have the right size we both find them to be very comfortable. They were very easy after downloading the Oura App to our phones it was very easy to connect; just follow the directions in the App itself. So far we’ve only had to charge them once and the app lets us know when it needs charging in which we were on our eighth day, so the battery life is close enough to what we expected. We do not remove are rings except for charging and cleaning and drying it after bathing or dishes etc. The scratch resistance so far is good and it does not appear or feel bulky to either one of us. The durability is great so far. Should anything change I will update this remove. WE LOVE how this ring keeps us on track with how our health is streaming along throughout our day and night. In our honest opinion we both feel this was money well spent. We have no regrets thus far.
    • Reviewed in the United States on November 6, 2024
      Size: Sizing KitVerified Purchase
      Don’t wing it - get the size kit and wear the ring on your finger for a day to see if you like it. I assumed I’d want the ring on my dominant ring finger (6), but with this kit actually found I prefer an index ring (8). I also would have completely gotten my index finger ring size wrong if I’d just decided to wing it. Glad I did this before making such a significant investment in a wearable. Poor fit is why my Apple Watch is gathering dust in a drawer.
      11 people found this helpful
      Report
    • Reviewed in the United States on February 16, 2025
      Size: Gifting Sizing KitVerified Purchase
      Helped size my ring, good instructions
    • Reviewed in the United States on October 13, 2024
      Size: Sizing KitVerified Purchase
      I recently ordered the Oura Ring Size Kit, excited to find my perfect size before purchasing the Gen 4 ring. However, I was disappointed to discover that the $10 credit for the size kit was not applied to my Gen 4 order.

      The size kit itself was helpful, but the lack of clarity regarding the credit policy was frustrating. I expected that the credit would automatically apply to my order, as advertised. Instead, I had to reach out to customer service for clarification, which added to the inconvenience.

      I hope Oura ring & Amazon can improve communication about their policies in the future. Overall, while I appreciate the size kit's functionality, the credit issue left a sour note in my purchasing experience.
      57 people found this helpful
      Report

    Top reviews from other countries

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    • Kindle Customer
      5.0 out of 5 stars Satisfecha con el producto
      Reviewed in Mexico on December 11, 2024
      Size: Sizing KitVerified Purchase
      Satisfecha con el producto
    • Thor
      5.0 out of 5 stars good
      Reviewed in the United Arab Emirates on January 25, 2025
      Size: Gifting Sizing KitVerified Purchase
      it is what it is
    • Nick
      5.0 out of 5 stars excellent
      Reviewed in the United Kingdom on January 23, 2025
      Size: Sizing KitVerified Purchase
      Perfect service