The answer to the question “are all ring sizes the same?” is they are not. Countries use different sizing conventions. Even if they agree to use a single standard, ring dimensions will never be the same because people’s fingers have different diameters.
The sizes used in the US and Canada are 0, 1/4, 1/2, 3/4, and then goes up to 1 up to 16. Each number has additional sizes in fractions. After ring measurement 1, it is followed by 1 1/4, 1 1/2 and 1 3/4 followed by 2, 2 1/4 and so on.
Ring Measurements in New Zealand, Australia and Ireland
Unlike in the US, measurements in these countries are measured in letters from A to Z. Just like with US and Canadian measurements, there are fractional sizes like A 1/2, B 1/2, C 1/2 and so on.
Sizing Conventions Used in Other Countries
In Japan, the sizes are from 1 to 27. In many European countries it is 0.5 up to 37.5. This sizing convention is used in Switzerland, Spain, Italy and many other countries.
Ring and Finger Size
Now that you know the answer to the question “are all ring sizes the same?” it is time to pick the right size. The easiest way to do this is to go to a jeweler. They will use steel gauge-rings sets to find the appropriate one for you. These sizers are available in a variety of widths. The narrower sizers are for those who intend to get a 7 mm ring or smaller. The wider sizers are for people who prefer an 8 mm ring or bigger.
Other methods are used. One technique involves putting your finger in a measuring hole. Another method measures the finger using a paper strip. Finger sizes can change during the day. Finger diameters are at their biggest during the day, so it should be measured then. If you measure in the night, the ring might feel tight during the day.
Other factors affect finger size such as exercise, water retention, humidity, temperature and the menstrual cycle. That is why it is important that rings are measured correctly. Even fitted rings can be re-measured for more precise fitting.
Even if you know the answer to “are all ring sizes the same?” there are still some things to take stock of. The first is that the measurement is in inches or millimeters. In the US, inches are used; in Europe it is mm.