blakeyates, just in case you don't get the American version on the app for whatever reason, allow me to give you a simple aid. One does not have to know the metric fractions, just memorize the whole numbers.
Metric is 18, 16, 14 for 15off, 22off, 28off, respectively. Note a reduction of 2 per length, starting with 18.
The next three in metric are 13, 12, 11, which goes with 32off, 35off, and 38off. Note a reduction of 1 per length.
Then 10, then 9 for 39off and 41off.
So let it flow, oh so natural.... 18, 16, 14 (15, 22, 28), then 13, 12, 11 (32, 35, 38),
then 10, 9 (39, 41).
Nate is about the only one who needs to differentiate the 2 nines (9.75 and 9.25)!! The rest of us mortals can read 9 as 41off.
As for speed, the differences are always in 3s, beginning at the top with 58K or 36mph. So the next tournament max is 55K, 52K, etc., corresponding with our American 34, 32, etc.
There you have it, easy to memorize and apply.
You're welcome.