Susan from Jomami Jewelry, put together this amazing guide for helping your measure your ring size at home!
There are two common and easy ways to measure your ring size at home—using string or a ring you already own—so you can get the right piece of jewelry.
Women’s rings are commonly between US sizes 3 and 9. The average ring size for women is between 5 and 7, but it’s always best to get an exact ring measurement before spending a lot of money.
OPTION ONE: USE STRING OR FLOSS TO MEASURE YOUR FINGER
You can measure your ring size using either string or, perhaps a more common item in your home, floss. Take one of these measurement tools and wrap it around the base of your finger, marking where the string or floss first overlaps with a pen. Then, line that up with a ruler and take down its length in millimeters.
There is one caveat with this method: String and floss can stretch, so try not to force your measuring tool too taut. If you do, your measured ring finger size may be larger than your finger actually is, and any rings you purchase may be too big.
The length of the string you measured in millimeters is the circumference of your finger. After finding this measurement, use the below conversion chart to find the corresponding ring size. If the size of your finger below the knuckle drastically differs in size from the knuckle itself, measure your knuckle as well and choose a size that falls more in the middle of these two measurements.
OPTION TWO: MEASURE A RING YOU ALREADY HAVE
You can measure your ring size using a piece of jewelry that you already have and know fits you.
If you have a ring that already fits your finger well, you can use a ruler to measure the inside diameter of this ring. Just take your ruler and measure straight across the inside of the ring from edge to edge. Take the diameter measurement in millimeters, and then use our measurement-conversion chart below to find your ring size.