Descartes wrote:
8-12%
Bingo. Most "fairly steep" hills are about that range. Anything over 14% is using different muscles (and it is hard to find anything that steep to be honest) and anything under ~6% is more useful closer to the season. 8%-12% is a good mix of pure power and speed.
www.gmap-pedometer.comhas an elevation feature that you can use to find the slope of a road. It is very accurate when measuring distance (I can measure tracks to 399-401 meters every time) and the elevation feature seems fairly accurate as well. Just find elevation, distance of the run, then put it into this formula:
100%*(elevation change in feet/distance in miles)/5280
so say the elevation gain is 20 feet, the distance is 65 meters (.04 miles)
100%*(20/.04)/5280=~9.5% (this is the hill I typically use, and run the ~65m in anywhere from 9.3 to 9.6 seconds when 90% (15 seconds/100m, worth maybe 12xx seconds on the track in spikes.