Go to a jewelry store and have them size you. Or go to Walmart, or whatever other store with cheap rings, and try on different sizes until you find one that fits.
you can go to a kohls as well and ask one of the people at the jewelry if they have a ring sizer. Thats what i did.
You can always go into a jewellery shop and they usually can test and see for you. :]
Jewelry shops has their tool for measuring finger size.
good idea here
Sometimes, your ring size is your shoes size
my mum said the exact same thing :p
never heard that on before :)