Oura Ring 5 Sizing Kit helps you find the perfect Oura Ring size for maximum comfort, accurate health tracking, and all-day wear. Use the sizing guide to ensure your Oura Ring fits securely for optimal sleep, activity, heart rate, and wellness monitoring, day and night.

Watch the video below.

1. Choose your finger

For the best performance and accuracy, we recommend wearing your Oura Ring on your index finger, middle or ring finger. Avoid fingers where the base is narrower than the knuckle to ensure a secure fit.

2. Test the fit

For the best Oura Ring 5 fit, position the sensor bumps on the palm side of your finger. The sizing ring should feel secure and comfortable around the base of your finger. Make a fist to test the fit—if there is a gap between your finger and the ring, try a smaller size to ensure optimal comfort and tracking accuracy.

3. Confirm Your Size

Once you're feeling good about the fit, confirm your size.

Oura Ring 4 has a new design featuring a round interior with flat sensors for a more comfortable fit. Please follow the guide below to find your perfect fit.

Watch the video below.

1. Choose your finger

Your Oura Ring can be worn on any finger. We recommend the index, middle, or ring finger for optimal performance.

2. Test the fit

Your Oura Ring should fit snug and secure on your finger, but not to the point where it's uncomfortable. Try making a fist to ensure there are no gaps between the ring and the finger. Wear the sizing ring with the size number visible on top of the hand.

Take your time to find the perfect fit, we recommend wearing your sizing ring for at least 24 hours before confirming your size.

3. Confirm Your Size

Once you're feeling good about the fit, confirm your size.