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

Oura Ring 4 Sizing Kit

The Oura Ring 4 Sizing Kit is the ideal way to find the perfect size. It’s a custom sizer that allows for you, and those around you, to find the ideal fit before purchasing.

Comfort & Accuracy
A properly fitting Oura Ring will result in the highest data accuracy, comfort, and overall experience.

Choose a Finger
Oura Ring works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing your Oura Ring on your index, middle, or ring finger.

How It Should Fit
Oura Ring should fit securely and comfortably at the base of your finger. Your ring should not rotate as you go about normal daily tasks. We recommend wearing your ring sizer for at least 24 hours to confirm your best fit.

Stuck between sizes?
We recommend choosing the smaller size for a few reasons:
1. The sensors inside your Oura Ring work best when they stay in close contact with your skin, especially the underside of your finger
2. A snug fit helps keep your data accurate and your experience consistent
3. Our plastic sizers can feel a bit "stickier" on your skin, so the actual Oura Ring may fit more smoothly.