Calculating % Grade of a Hill

[Mr. Bloom]

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?

[uforgot]

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!

[susan.wells]

Claudia is correct. Here is a link that gives a little detail --> grade.

[kelownagirl]

And here's a link that does the calculations for you.


http://www.csgnetwork.com/inclinedeclinegradecalc.html

[Mr. Bloom]

Thanks Ladies!

[uforgot]

Well, I'm standing in front of my geometry class, telling them how I used slope in an actual application, and I mention also that I have a new GPS and we can figure out the grade of a hill I rode Saturday. The hill is one block away, and they're going "what the heck, let US do it!"

With tape measures and my GPS we took measurements and the change in elevation. We did several hills. (Hey it's the first time we've had sunshine in months!). We came in, drew it out and someone notes "hey, our measurements are actually the hypotenuse, for run we have to use the pythagorean theorem!". It certainly was a proud moment for me. They proceeded to calculate the grade of 3 hills, and one student noted that you can't till a hill higher than 10%. (Farming community). They had a blast today, and I'd be willing to bet that they think about this sometime when they are driving up or down a hill.

Thanks for the idea! Now, how often do I have to use this GPS in order to make it tax deductible?