To measure a ring size with string, wrap it snugly around the base of the finger, mark the overlap, then measure the string's length in millimeters (mm) with a ruler; this circumference measurement (e.g., 54mm) is then compared to an online ring size chart to find the corresponding ring size, noting that string can stretch, so be careful not to pull too tight for accuracy.
Make sure the string wraps around completely around your finger. Do not wrap the thread too tightly or loosely around your finger. Unwrap the thread and use the chart below to find the size of your ring. If the length of the thread falls between 2 sizes then look for a ring in the bigger size.
How to Measure Your Ring Size at Home Using Yarn!
3 Ways to Figure Out Ring Size at Home
Here's how the string method works:
A 7cm (70mm) finger circumference is a large ring size, typically around a US Size 13, a UK/AU Size Z+1 (or Z+2 depending on chart), and an approximate European size 65-67, fitting a larger adult finger, often a man's, as most women's sizes are between 5-9 US and men's 9-12.
Wrap a piece of string around your ring finger and cut it at the point where the ends overlap. Line the string up with the ring size guide provided on the ring size chart. The one that best matches is your ring size. If the ring is between two sizes, choose the larger one.
Your printable ring sizer from Zales. Choose from our three accurate measuring techniques. For accuracy, please ensure that PDF is printed at 100%.
The String Test
It might seem obvious, but measuring the wrong finger is a common mistake. If it is a surprise, you can mistakenly measure a ring your loved one already owns but wears on a different finger. Be sure to measure the finger they intend to wear the ring on, as different fingers can have different sizes.
How to measure your ring size with string
If your lady is a deep sleeper, you can try measuring her finger as she sleeps. You can do this by wrapping a piece of paper or string around her ring finger. You can then take this measuring strip to a jeweler who will be able to figure out her size based on that.
Take a length of floss or string, or a slip of paper and wrap it around the base of your finger. Mark where the floss, string, or paper first overlaps with a pen. Stretch the length of string or paper out along a ruler or measuring tape, and take down the length in millimeters.
One common method to get ring size that many people suggest is to use a string and tie it around the finger when your loved one is sleeping. I strongly do not recommend this. Every fraction of a millimeter results in a different ring size, and going with this method has a lot of room for error.
The "3-month ring rule" is an outdated marketing guideline suggesting spending the equivalent of three months' salary on an engagement ring, a concept created by De Beers to boost diamond sales, evolving from earlier one and two-month suggestions. Today, it's widely seen as a myth, with most couples prioritizing personal financial comfort, open communication, and meaningful choices over this arbitrary rule.
Rings that can't be resized usually involve hard, brittle metals like tungsten, titanium, and ceramic, or designs like full eternity bands (stones all around) and rings with tension settings, as resizing would damage the metal or stones; also, rings with intricate patterns or antique/fragile construction are often impossible to alter.
In the morning, most people wake up with slightly swollen fingers. That's because while sleeping, your body stays still, and fluids settle. You might not notice unless you're trying to push a snug ring over your knuckle before getting out the door.
5.5 cm is gonna come out to 55mm which would be a size 7.5. 5.6cm will be 56mm which comes out to a size 8.
Follow these quick steps to learn how to measure ring size accurately: