Based on common sizing for adults who exercise regularly. These are approximate starting points to help guide your selection. If you favor the middle finger this may be more comfortable depending on user.

Using the Free App is more accurate.

Download from Your App Store (Free, no in-app purchases). This is a suggested app and is NOT a requirement for LYF Ring. It gives you an idea of your size.

Once the Ring app has been downloaded, set the settings to US Sizes. Place a ring you may have on the screen and use the slider to match the INSIDE of the ring. The best fingers to use for LYF Ring will be the Pointer, Middle and Ring fingers.

Please remember that your fingers do change size with the seasons. It is not uncommon to change the ring on fingers for comfort, it will still work the same.