There are a few ways to find yours or someone elses ring size.  The first way is to visit this link which has a great video on how to find your size at home: https://www.buybluesteel.com/pages/find-your-ring-size.  Another way is to purchase our ring sizer which is likely the most accurate.  You can buy the sizer here: https://www.buybluesteel.com/products/blue-steel-ring-sizer.  If you still have questions, you can call us or email us and we'd be happy to help.