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Oura Ring 4 Sizing Kit - 2 of 4Oura Ring 4 Sizing Kit - 3 of 4Oura Ring 4 Sizing Kit - 4 of 4
Oura Ring 4 Sizing Kit - 1 of 4

Oura Ring 4 Sizing Kit

$10.00

In Stock

Eligible for registries and wish lists

Sponsored

About this item

Highlights

  • GIFT CARD WITH PURCHASE - Receive a $10 Target gift card to use towards Oura Ring 4 purchase.
  • SPECIFIC SIZING - Oura Ring 4 sizing is different from Oura Ring Gen3 sizing. For Oura Ring 4, size with the Oura Ring 4 Sizing Kit.
  • CHOOSE A FINGER - The Oura Ring 4 works on all fingers and can be worn on either hand.
  • INDEX FINGER IS MOST ACCURATE - For optimal accuracy, we recommend wearing your Oura Ring on your index, middle, or ring finger.
  • HOW IT SHOULD FIT - Oura Ring 4 should fit securely and comfortably at the base of your finger.
  • SIZE FOR ALL DAY USE - Your ring should not rotate as you go about normal daily tasks.
  • 24 HOUR TRIAL - We recommend wearing your ring sizer for at least 24 hours to confirm your best fit.
  • OURA RING 4 SIZES - Oura Ring 4 is available in sizes 4-15. There are no half sizes.
  • SIZER MATERIALS - Ring sizers are made of plastic, while Oura Ring 4 is crafted with titanium.

Description

The Oura Ring 4 Sizing Kit is a custom sizer that allows for you, and those around you, to find the ideal fit before purchasing. Oura Ring 4 sizes are slightly different from standard ring sizes, so it is important to size yourself using our sizing tool and to follow our instructions. A properly fitting Oura Ring 4 will result in the highest possible data accuracy, comfort, and overall experience.

Easy steps to start your health journey today!
1. Purchase the Oura Ring 4 Sizing Kit.
2. Learn your Oura Ring 4 size by wearing a sizing ring for at least 24 hours.
3. Purchase your Oura Ring 4 online or in a Target store near you.


Looking for the best health tracker? Whether you’re searching for a sleep ring or fitness ring, Oura Ring is for you— this revolutionary smart ring that allows you to discreetly track your sleep, activity, recovery and stress, in style.
Weight: .1 Pounds
Compatible With: No Applicable Model
Material: Plastic
Battery: No Battery Used
TCIN: 92396509
UPC: 6430060152311
Item Number (DPCI): 057-03-4787
Origin: Imported
If the item details aren’t accurate or complete, we want to know about it.

Shipping details

Estimated ship dimensions: 5.9 inches length x 4.4 inches width x 0.5 inches height
Estimated ship weight: 0.1 pounds

Return details

This item cannot be returned; please reference our return policy for more information.
See the return policy for complete information.

Q: Does the $10 gift card have to be used towards the purchase of the ring? I want to buy the sizing kit but plan to ask for the ring as a gift from someone else.

submitted by Kayla m - 5 months ago
  • A: Yeah it’s not how oura rings work.

    submitted byCourtney - 23 days ago
  • A: Hi, thank you for reaching out about Oura Ring 4 Sizing Kit. The details does state you will receive a $10 Target gift card to use towards Oura Ring 4 purchase. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

    submitted byMatt - 5 months ago
    Target expert support

Q: What is the internal size of each ring in mm?

submitted by wit - 1 year ago
  • A: Hi wit, thanks for reaching out about Oura Ring 4 Sizing Kit The internal size of the ring varies based on the size of the ring selected. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

    submitted byJustin - 1 year ago
    Target expert support
  • A: It depends on the size of the ring itself. The sizing kit will help you determine approximately what it is. This product page is for the sizing kit only, not the individual rings.

    submitted byceleste80 - 11 months ago

Q: Hi! How to get a target gift card10$ purchasing oura ring size kit?

submitted by Alex V - 1 year ago
  • A: After your purchase is completed online, you will be emailed information and the $10 gift card to use towards the Oura 4 Ring purchase.

    submitted byceleste80 - 11 months ago
  • A: Hi Alex V, thanks for reaching out about Oura Ring 4 Sizing Kit. To better understand your individual needs, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

    submitted byJoe - 1 year ago
    Target staff support

Q: does the sizing kit work to figure out what size you are

submitted by brassring - 1 year ago
  • A: lol yes that’s the point

    submitted byAubs17 - 1 year ago
  • A: Hi brassring, thanks for reaching out about the Oura Ring 4 Sizing Kit. Yes, the Oura Ring 4 Sizing Kit can help you determine the right size Oura Ring for you. The Oura Ring 4 Sizing Kit is designed to help you find the best fit before you buy the ring If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

    submitted byRena - 1 year ago
    Target expert support

Q: I read where the ring needs to fit somewhat snuggly around your finger, what if the knuckles are large and then the ring would have to be big enough to go around the knuckles first?

submitted by Broketeacher - 1 month ago
  • A: Hi, thanks for reaching out about Oura Ring 4 Sizing Kit. That is the exact dilemma faced by many people when sizing rings, especially for the Oura Ring where a consistent, snug fit is vital for sensor accuracy! You are correct: if your knuckles are large, the ring size must be big enough to clear the knuckle first. Oura addresses this specific challenge directly, and here is the guidance on how to find the right fit using the sizing kit: 1. Prioritize Clearing the Knuckle The most important rule is that the ring must slide over the largest part of your finger (the knuckle) without being too difficult or painful to remove. If the sizing ring is too hard to get off, the final ring will be even worse when your fingers swell (which happens overnight, after exercise, or in the heat). 2. The Snug-Fit Compromise Oura's goal is to have the three sensors (the small bumps on the inside of the ring) sit snugly against the palmar side of your finger (the bottom fleshy part). If you have large knuckles, you will have to accept a ring that is slightly looser at the base of the finger than a person with straight, uniform fingers. The trade-off is unavoidable, so aim for this balance: Knuckle Check: The ring slips over the knuckle with a slight twist but does not require lotion or soap to remove. Base Check: Once past the knuckle, the ring should not spin or turn freely on the base of your finger when your hand is relaxed. If it rotates easily, it is too loose and will lose sensor contact. Fist Check: When you make a fist, there should be little to no large gap between the ring and your skin. 3. Try Different Fingers Oura is built to work on any finger (index, middle, or ring finger) on either hand. The company often recommends the index finger because it typically has a more consistent diameter (less taper from knuckle to base), which can result in a more snug fit. If a size is too loose on your middle finger after clearing the knuckle, try that same size on your index or ring finger to see if you can achieve the necessary snugness without the spinning. 4. Wear the Sizer for 24 Hours Finger sizes change throughout the day and night due to temperature, hydration, and swelling. Since Oura gathers critical data overnight, you need to know how it feels when your finger is at its largest. Wear the plastic sizing ring for at least 24 hours (including sleeping). If you can comfortably remove it in the morning without struggle, it's likely the right size for clearing the knuckle. Ultimately, use the sizing kit to find the largest comfortable size that still sits without significant, constant spinning at the base of your finger. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

    submitted byJoe - 1 month ago
    Target staff support

Q: Is it possible to see if my HRA funds provider (OCA) will cover this purchase?

submitted by Micaela - 3 months ago
  • A: Hi, thank you for reaching out about Oura Ring 4 Sizing Kit. You would need to reach out to your provider, then for help with payment methods, please reach out to Target Guest Services at 1.800.440.0680. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

    submitted byMatt - 3 months ago
    Target expert support

Q: Can you use this kit for more than one ring? Or do you need to purchase a kit per ring purchased?

submitted by Peggy - 8 months ago
  • A: Hi Peggy, thanks for reaching out about Oura Ring 4 Sizing Kit. No, you do not need to purchase a separate Oura Ring 4 sizing kit for each ring you intend to buy. The Oura Ring 4 sizing kit contains a full set of plastic sample rings (sizes 4-15) that you can use to find the best fit for your finger. You only need one kit to determine your size, regardless of how many Oura Rings you plan to purchase. In fact, Oura and its retailers often offer a credit (e.g., $10) towards your Oura Ring purchase when you buy the sizing kit, encouraging you to use it to ensure the correct fit for optimal accuracy and comfort. You can also share the sizing kit with friends or family if they are considering an Oura Ring, as it's designed to help multiple people find their ideal fit. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

    submitted byJoe - 7 months ago
    Target staff support

Q: Can you use this for sizing the Oura ring 3 also?

submitted by anonymous - 1 year ago
  • A: Hi anonymous, thanks for reaching out about Oura Ring 4 Sizing Kit. No, the Oura Ring 4 Sizing Kit is not compatible with the Oura Ring 3 If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

    submitted byJoe - 1 year ago
    Target staff support

Q: What does this ring do?

submitted by Pie - 1 year ago
  • A: Hi Pie, thanks for reaching out about the Oura Ring 4 Sizing Kit. This is the Sizing Kit. The Oura Ring uses three small sensors in the interior of the ring equipped with infrared light photoplethysmography to track users' heart rate, blood oxygen, breathing regularity, heart rate variability, temperature, activity, and sleep. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

    submitted byRena - 1 year ago
    Target expert support

Oura Ring 4 Collection

Oura Ring 4 Collection

About the collection
Oura Ring 4 is the latest evolution of the revolutionary smart ring. Oura Ring 4 is powered by Smart Sensing, a breakthrough innovation that adapts to each member’s unique finger to deliver accurate, continuous data, day and night. Oura Ring 4 is available in an expanded size range (sizes 4-15), and six finishes. It features a new sleeker, fully titanium design and discreet sensors on the interior, enhancing both durability and wearability.

• Compatible with iOS and Android
• Up to 8 days battery life
• Fully titanium
• Powered by Smart Sensing
• Water resistant up to 100m

Oura Ring 4 sizing is different from Oura Ring Gen3 sizing. For Oura Ring 4, size with the Oura Ring 4 Sizing Kit.
View Oura Ring 4 Collection collection

Related Categories

4.0 out of 5 stars with 59 reviews
25% would recommend
4 recommendations
1 out of 5 stars
18 December, 2025Verified purchase

(no review title)

Misssing rings.
dacey
1 guest found this review helpful. Did you?
5 out of 5 stars
Thumbs up graphic, would recommend
7 December, 2025Verified purchase

(no review title)

I don’t know why anyone is writing a negative review… you buy this get a $10 GC it’s free and that easy. Has 0 issues doing this…
Brianna
8 guests found this review helpful. Did you?
1 out of 5 stars
3 December, 2025Verified purchase

(no review title)

I was supposed to get a $10 gift card with this item and Target did not give me
Dee
3 guests found this review helpful. Did you?
1 out of 5 stars
Thumbs down graphic, would not recommend
26 November, 2025

Gee willikers

How dystopian that you can't just go to the store and get sized for a 500 dollar ring for free.... They charge you to even find out what size you are .
ThatsaYikesfromme
quality: 1 out of 5
value: 1 out of 5
22 guests found this review helpful. Did you?
1 out of 5 stars
25 November, 2025Verified purchase

(no review title)

The package was opened when I received it. One of the rings was missing. And it’s non returnable even though it should have never been sold to me in this condition. Clearly someone returned it…
Connie
quality: 1 out of 5
value: 1 out of 5
10 guests found this review helpful. Did you?
1 out of 5 stars
9 November, 2025Verified purchase

(no review title)

Even though I purchased the ring I was still unable to return the sizing kit.
Meghan
6 guests found this review helpful. Did you?
1 out of 5 stars
Thumbs down graphic, would not recommend
15 October, 2025Verified purchase

Not accurate to product

We were buying this as a gift, we tried on th rings and wore the size for the 24 hour period. We bought the ring and it was larger than the actual product, we now have to return the ring and order another size
Justin
quality: 1 out of 5
value: 1 out of 5
21 guests found this review helpful. Did you?
1 out of 5 stars
Thumbs down graphic, would not recommend
17 November, 2024Verified purchase

do not purchase

do not purchase any Oura items from target, the items do not work and the store will not accept a return
SR
126 guests found this review helpful. Did you?

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