The Oura Ring is recommended to be worn primarily on the index finger for optimal performance and accuracy. The index finger has larger blood vessels, which helps optimize the ring's photoplethysmogram (PPG) pulse monitoring sensor signals. If the index finger is not preferred, the middle finger or ring finger are good alternatives. It is advised to avoid fingers with large knuckles where the base of the finger is narrower than the knuckle for a better fit. The ring can be worn on either hand and users often choose based on comfort, fit, or personal habits. The ring should fit snugly but comfortably, not too tight or loose, and should stay in place during daily activities and sleep. Users may switch fingers if needed due to weight changes or swelling. In summary:
- Best finger: Index finger (recommended for best sensor contact and accuracy)
- Alternatives: Middle finger or ring finger
- Avoid: Fingers with large knuckles that make fitting difficult
- Wear on either hand, depending on comfort and convenience
This guidance is from Oura's official sizing and usage advice and supported by user experiences.
