Apparently we use at least two standard definitions, as I believe we all know and many/most use knots.
In Europe the SI unit meter per second (m/s) is the standard, but knots used very often too because it is the standard worldwide sailing unit for speed and wind.
Some use other units on a worldwide forum as this is, like kph (km/h in Europe) or mph or even the old beaufort scale maybe.
What is your locally used unit(s) that you can relate to the easiest ?
It might be your own preference, but could also be local weather stations determining eventhough you dont prefer that unit, thus one can choose two options.
A poll like this has to be easy, even though it would be really interesting to see WHERE they are used.
Okay, if some use km/h or mph (or beaufort, but I doubt any use this ancient type ?), maybe they can answer which location that is ?
That would clarify and be interesting, as there are huge local differences it seems
1 knot = 0.514 m/s = 1.852 kph = 1.151 mph
If one should make super easy conversions:
Divide knots with 2 to get m/s. Only a 2-3% error then so very easy and usable.
Multiply knots with 2 to get kph. But here you got 7-8 % error, which is substantial.
One on one, mph is just over 15 % off from knots, a big difference.