There are alot of spells in GW2 that have an area effect or that are ranged attacks. All those effects give us a number that represents the range/radius of those.
The only source i found which translates units into meter was on GW2 wiki in the Compass description:
"... Zoomed in, the range of the compass is 2500 units, representing 63 meters/208 feet ..."
So 2500/63 = 39,68253968253968 or simply 40 ^^
1m = 40 units.
some examples
1,200 units = 30m 900 units = 22,5m 300 units = 7,5m 130 = 3,25m
The area effect spells show circles anyway, i thought this could still be interesting to get a feeling for the numbers.