Our ring size is based on the ring sizes in the US. Women's rings typically range from size 3 to size 10. The most common women's ring sizes at JIWON CHOI range from size 5 to 7. Men's rings typically range from size 8 to 15. The most common men's ring sizes at JIWON CHOI range from size 8 to size 10.5. 


1. Cut out a piece of paper as a strip.

2. Select a finger and wrap the piece of paper around it.

3. Measure the length of the paper with a ruler

4. You have the outer diameter of your own finger which is the inside diameter of your ring!


US & Canadian Ring Sizes (Inner diameter):

size 3 14.1mm
size 3.5 14.5mm
size 4 14.9mm
size 4.5 15.3mm
size 5 15.7mm
size 5.5 16.1mm
size 6 16.5mm
size 6.5 16.9mm
size 7 17.3mm
size 7.5 17.7mm
size 8 18.1mm
size 8.5 18.5mm
size 9 19mm
size 9.5 19.4mm
size 10 19.8mm
size 10.5 20.2mm
size 11 20.6mm
size 11.5 21mm
size 12 21.4mm
size 12.5 21.8mm
size 13 22.2mm
size 13.5 22.6mm


* We cannot guarantee that ring sizing via paper will accurate; therefore, please refer to the size you already have in your rings as well as recommend getting sized by a local jeweler. Thank you! If you have any questions, please ask via hello@jiwonchoi.com