The String Technique

How to use string or floss to measure your finger:

1. Take a length of floss or string and wrap it around the base of your finger.
2. Mark where the floss or string first overlaps with a pen.
3. Stretch the length of string out along a ruler or measuring tape, and take down the length in millimeters.
4. A size 3 ring is 14 mm, and a size 4 is 14.8mm. 

Pro Tip: String and floss can stretch, so don't pull them too taut. If you do, your measured ring finger size may be larger than your finger and any rings you purchase may be too big.