Well, ITCZ, I suppose it depends on how anally retentive any particular pilot wishes to be? a.l. already has the equation and his answer (see Genghis the Engineer's post) if he wishes 8 decimal point precision in metric bits.
Your post yesterday was more than sufficient to cure a.l. of insomnia.
If I wished to avoid weather at 5 or 10 AoB I would probably use the 'TLAR' rule of thumb.
I trust you spotted the carefully hidden
in my previous post?