I use "sixths" as taught by my class act of an instructor (who would bellow "try not to rip the ***** nosewheel off" as we turned finals by way of encouragement - top bloke
)
Ie, wind up to 10 degs of runway heading = XW is 1/6th of wind
20 degs = 2/6ths (1/3 for the hard of riffmaticking)
30 degs = 3/6ths (1/2)
and so on, up to
60 degs and above = it's all crosswind.
Common sense should tell you that these are just broadbrush guidelines, not accurate but good enough to give you a feel for the situation.