Calculating % Grade of a Hill

[lacyliz]

I tried calculations- yes, they work. But Specialized, Blackburn and others sell cyclocomputers that give you the %grade of a hill (altimeter feature), feet of elevation, etc. They're fantastic and this way you could compare your hills to hills on other rides, practice the % grade you want and everything. They run about $100, but well worth it (most have cadence, time, mph and everything you could possibly want)