Someone asked me how to compute the grade of a climb. Here's a quick and fairly accurate way. Divide the elevation gain ("rise") in feet by the length ("run") of the climb in miles. Then divide the result by 50 (52.8 = 1% of a mile). So 2500 feet of rise divided by 5 miles of run is 500. 500 divided by 50 is 10. So a 10% grade.