Spazz, there are a variety of ways. You can use an inclinometer, a computer with an altimeter, maps that report it, club myths, tall tales, fellow post-ride drinkers and other stories. Sometimes clubs will post elevation profiles for rides. All you need to know is distance and elevation change.
You could probably also go to topozone and check the elevation for various spots on the road and calculate the slope. I think there are threads on this subject over on cyclingforums and bikejournal where people have posted links to various mapping software on the internet where you might be able to look up altitiude and then just do a WAG for an entire ride.
For instance, we have a 10.6 miles mtb ride with a cumulative gain of 2,020 ft (per V's compooter). On the assumption that 1/2 of the ride is climbing, a WAG tells you that the average climb is 7.2%.



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I have watched yellow jackets (our guys) disappear around the first bend and thought "Hmmmmm, when am I going to do this thing?" Since I'm doing Chico century I figure I might as well get a little more climbing in before I do Honey Run
). Mmmmmm... V...
