Calculating % Grade of a Hill

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I'm playing around on routeslip.com trying to plan out some routes.

I'm interested in focusing on hills, but I'm curious how slope translates in % grade. For instance, a road sign will say "10% grade"

If I'm looking at a route that rises 300 feet in 2 miles, what does that mean in terms of % grade?

Anyone know how to convert this?

It would be the slope of the hill written as a %. Rise over run. The run is 2 miles, but you need to change it to feet. 10,560 ft for the run and 300 ft for the rise. 300/10,560 = .028409 or 2.84% grade.

Gosh, can't wait to tell my Algebra students that once again, I used it in my daily life!