Note also the /# is always larger than the gauge it is applied to. It can be calculated by simply taking the "Average" of the gauge & the next larger one & dropping all decimal points beyond three places, not rounding. If you calculate 11 gauge rounded to three decimal places you will get the same size as a 12/1 but this isn't necessarily true for all the /1 sizes as they are not true "Fractions" just an average.
For those gauges from 10 up through 3 you simply take the difference between the two gauges & split it into thirds, again dropping all numbers beyond three decimal places.
