Oura Ring Gen 4 Size Chart & Sizing Guide 

To get the accurate sleep tracking and comfort and accurate health data, it is crucial to select the correct size of the Oura Ring Gen 4. The smart-ring sizing in Oura Ring Gen 4 is proprietary, so it is not compatible with the standard ring sizes.

What size should I get for Oura Ring Gen 4?

Oura Ring Gen 4 comes in whole sizes 4-15 and does not fit any usual ring sizes. Oura highly suggests the use of official Gen 4 sizing kit and wearing it at least 24 hours to make it comfortable and to provide correct sensor readings.

You can check the official Oura Ring size chart to understand the full sizing breakdown before selecting your ring.

Why the Oura Ring Gen 4 Sizing Kit Is Required

Oura highly suggests due to the fact that:

• The sizes of Oura are not the same as jewelry rings. This is because ring size based on circumference.
• The ring has inbuilt sensors.
• The correct fit has a direct effect on the sleep, heart rate, and readiness scores.
• The Gen 4 sizing kit was designed to fit the interior design of the ring, which is rounded, and thus, it is the only sure way of sizing the ring.

Oura Ring Gen 4 Size Range: 

• Whole sizes only
• No half sizes

Available Sizes:

• Oura Ring Gen 4: Sizes 4–15

Because half sizes are not offered, testing the sizing ring is critical.

Best Finger for Oura Ring Gen 4

Oura recommends wearing the ring on:

1. Index finger (best accuracy)
2. Middle finger
3. Ring finger

The ring should:

• Fit snugly without rotating
• Slide over the knuckle comfortably
• Remain comfortable during sleep

Oura Ring Gen 4 Interior Design & Fit

Oura Ring Gen 4 has a rounded inside, which makes it more comfortable and has uniform sensor contact.  Nonetheless, with this design improvement, proper sizing is needed to ensure proper tracking.