Name: Oura Ring 4 Sizing Kit
Brand: Oura
Price: 5 GBP
Availability: InStock

Product details

Key features

Ensure optimal accuracy and comfort day and night by finding your perfect Oura Ring 4 size before it arrives.
Wear your ring on any finger, with the index, middle or ring finger recommended for optimal performance.
Get a snug and secure fit by making a fist to check there are no gaps between the ring and your finger.
Read your size effortlessly by wearing the sizing ring with the number visible on top of your hand.
Find your exact match with Oura Ring 4 sizing available from size 4 to 15.

In more detail

Ensure optimal accuracy and comfort day and night by using the Oura Ring 4 Sizing Kit to find your perfect size before your ring arrives.

Choose your preferred finger

Wear your Oura Ring on any finger that feels best. The index, middle or ring finger is recommended for optimal performance.

Check for a secure feel

Get a snug and secure fit that remains comfortable throughout the day. Make a fist to check there are no gaps between the ring and your finger.

Read your size easily

Determine your exact match from sizes 4 to 15 by wearing the sizing ring with the size number visible on top of your hand.

Specifications

Band Color	White
Band Size	7-11
Water Resistance	Yes
Product Dimensions (WxD)	108.5mm x 108.5mm
Sensor Height (mm)	31mm
Weight	55.17g
Case Dimensions (HxWxD)	0.7mm x 7.8mm x 21.46mm
Manufacturer Part Number (MPN)	JZ98-54867
EE Article Code	400025587

FAQs

The Oura Ring 4 Sizing Kit is a set of plastic trial ring sizers that helps you find your correct Oura Ring 4 size before purchasing your ring. It includes white plastic ring sizers covering sizes 4 to 15, allowing you to test different sizes on different fingers over a period of time to confirm which size fits most comfortably and securely. Getting the right size is essential for both comfort and accurate health tracking.

Oura Ring sizes use their own proprietary scale that does not correspond directly to standard jewellery ring sizes. This means your usual ring size may not match your correct Oura Ring 4 size. Additionally, sizing can differ between generations, Oura Ring 4 sizes are slightly different from Oura Ring Gen3 sizes, so even existing Oura users should use the correct sizing kit when upgrading. The only reliable way to confirm your size is to test the dedicated Oura Ring 4 sizers.

Place the plastic trial sizers on different fingers and wear them throughout the day and, if possible, overnight. Finger diameter can fluctuate with temperature, hydration and activity, so wearing the sizer for an extended period gives you the most realistic sense of how your final ring will fit. Test the sizing on both hands, as finger sizes can vary between your left and right hand. Once you’ve identified the size that feels snug but comfortable, that’s your Oura Ring size.

The key test is to make a fist while wearing the sizer. If you can see a gap between the sizer and the top of your finger when you clench your fist, the size is too large, try the next size down. The ring should sit securely against your finger without slipping, while still being comfortable to remove. A well-fitting Oura Ring will stay in place during sleep and active movement without feeling tight or restrictive.

Oura recommends wearing the ring on your index finger for the most accurate sensor contact, as the sensors should be positioned against the palm side of your finger. However, you can test the sizing kit on any finger, index, middle or ring finger being the most common choices. Try several fingers on both hands to find the combination of finger and size that feels most natural before committing to a size.

The Oura Ring 4 Sizing Kit includes all sizes from 4 to 15 to accommodate every user. The sizes 7 to 11 available are the most commonly worn adult ring sizes. The broader range in the kit simply ensures everyone can find the right fit. If the Sizing Kit confirms your size falls below 7 or above 11, it’s worth contacting Oura directly or checking their full range, as additional sizes may be available through other channels.

No. The sizing for Oura Ring 4 is slightly different from Oura Ring Gen3, so the two sizing kits are not interchangeable. The Oura Ring 4 Sizing Kit uses white plastic sizers, while the Gen3 kit uses black ones, this makes it easy to tell them apart. Even if you’re an existing Oura Ring user, Oura strongly recommends using the Ring 4-specific sizers when purchasing a Ring 4 to ensure an accurate fit.

The Sizing Kit is a separate purchase. When you buy an Oura Ring 4 directly in a specific size, the ring comes with a size-specific charger and USB-C cable but not a sizing kit. If you’re unsure of your size, it’s strongly recommended to purchase the Sizing Kit first, confirm your fit, and then order your ring in the correct size. This avoids the inconvenience of ordering the wrong size ring.

Once you’ve tested the sizers and identified the best fit, you can order your Oura Ring 4 directly in that confirmed size, available in Gold, Silver and Stealth (and other finishes) in sizes 7 to 11. The Sizing Kit itself is a one-time tool; once you know your Oura Ring 4 size, you can order the ring directly in that size in future without needing to repeat the process.

Yes. A ring that is too loose can shift on the finger during sleep and activity, causing the sensors to lose consistent contact with your skin and reducing the accuracy of readings such as heart rate, HRV and SpO2. A ring that is too tight can be uncomfortable and may cause circulation issues during prolonged wear. A properly fitted Oura Ring 4 delivers the most accurate, reliable health data, which is precisely why investing time in using the Sizing Kit before purchasing is recommended.

Oura Ring 4 Sizing Kit

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