You can also measure your finger yourself at home using a tape measure or ruler. The easiest way is to go to a jewelry store and have them measure your finger.Ģ. There are a few ways to find out your ring size:ġ. It’s also important to keep in mind that ring sizes can vary slightly from day to day depending on things like temperature and swelling, so it’s best to measure your fingers at different times of day for the most accurate results. The best way to ensure an accurate measurement is to take multiple measurements and average them out. Once again, mark where the two ends meet and then measure the distance with a ruler. Another way to measure your ring size is to use a mandrel (a metal or plastic rod) and place it on your finger. Once you have wrapped it around, mark where the two ends meet and then measure the distance with a ruler. The most common way is to use a piece of string or thin strip of paper and wrap it around the base of your finger. There are a few different ways that you can measure your ring size at home.