• Ruler
• Thin strip of paper
• Cut a thin strip of paper

Wrap the paper around your finger. Make sure the paper is below the joint of your finger and close to your knuckle.
Mark the spot where the paper meets and measure the distance with your ruler.
Use the following chart to determine your ring size. Rings also come in half sizes, the measurements of which, of course, will fall somewhere in between the whole sizes.

Size 4: 1 13/16 inches
Size 5: 1 15/16 inches
Size 6: 2 1/16 inches
Size 7: 2 1/8 inches
Size 8: 2 1/4 inches
Size 9: 2 5/16 inches
Size 10: 2 7/16 inches
Size 11: 2 9/16 inches
Size 12: 2 5/8 inches
Size 13: 2 3/4 inches
Size 14: 2 7/8 inches