Got a nice little formula from a friend the other day.
[ H2 / 10D ]
where H = height difference in meters,
and D = distance traveled in meters)
My Col de Pilot ranks a measly 2.4.
The ride planned for November.... 6.4, which if it was in Colorado, it would be the 3rd toughest climb in the state.
BTW the site where I got this is Colorado Bicycle Climbs.
Might just break this down and try to compile this info for my island/state.