All rings are US standard size.
If you don't know your ring size, we recommend
buying a ring sizer in order to get the correct size.
Buying the ring sizer is more affordable than returning or resizing your ring.
Also, you can have it for life and know your finger size for future purchases.
Alternatively, you can go to a jewelry store and get your fingers measured.
Online DIY methods are inaccurate, therefore, we don't recommend relying on them.