Hello.

There may be some errors because the size of each country is different, but you can think that it's almost right.

You can order a Korean size for the ring you usually wear. 

If you don't know the size of your ring, compare the diameter of the hole if you have a ring you usually wear. 
If you don't have a ring, visit the jewelry shop and measure it, or measure the circumference of your fingers with a thin thread.
If you loosen it, there may be an error, so I recommend you to take a tight measurement.
Also, if the joints of the fingers are thicker than the fingers, measure them based on the joints.
(If not, it will be difficult to wear due to a pinch on the knuckles.)
And if the measurement is complete, please compare the size table and order the Korean size.
Thank you. 

[ Original Message ]

I am in the USA and want to order.  However, I am not sure what size.  Are ring sizes universal..or do they run differently there...like clothing sizes do?