The best thing you can do is go to any local jeweler and ask to have your ring size measured. Any jeweler can do it in a few minutes while you wait. A few may charge about five dollars, but most will do it for free.
If you absolutely can’t get to a jeweler, you can download and print the sizer below. If you have a ring that fits the finger, set it on the circles and match the inside edge to the circle line. If you don’t have a ring to use, the paper strip is a last resort: wrap it around the finger, thread the tail through the slit, and read the size at the slit. Be sure to follow the instructions on the page.
Note:
Please be sure of your size before you order. If the size you give me turns out to be wrong, that’s the customer’s responsibility. Return shipping and any remake are at full price, paid by you. See my shipping, return, and replacement policies for details