To measure your ring size, you need just a few common household items:
- A piece of string, dental floss, or paper
- A ruler with millimeter measurements
- A pen for marking (if using paper)

Your finger's size can change due to various factors such as temperature, time of day, or physical activity. For the most accurate measurement, make sure your hands are at room temperature, and it's better to measure at the end of the day. Ensure you haven't recently exercised, consumed alcohol, or eaten a lot of salty food as these can cause your fingers to swell.

Take the piece of string, floss, or strip of paper and wrap it around the base of your finger. It should fit snugly, but not too tight. Make sure it can slip over the knuckle. Mark where the string or paper overlaps to form a complete circle.

Now, take your marked string, floss, or paper and measure it against the ruler in millimeters. The length you get corresponds to the circumference of your finger. To convert this measurement to your ring size, you can use an online ring size chart or guide.

Please note that ring sizes can vary between countries. Explore the conversion chart to understand how US ring sizes correspond to finger circumference and how they are translated into sizes used in Canada, Australia, the UK, and other nations.