By installing
Qalculate! and including it in the path system variables, now I'm able to do quick unit conversions, without the need of opening the GUI Calculator (or googling).
Code:
cmd /k qalc ""%1"lb to kg"
so when I type
q 341
in the
command line bar, a command prompt opens instantly with the conversion:
341 pounds = approx. 154,6749982 kg
This is how the plugin config looks: