Welcome to OnlineConversion.com

angle to percent grade

angle to percent grade
by kim on 06/07/04 at 06:53:44

My high school trig has failed me.  how do you convert an angle in degrees to a percent grade (as on a highway - 10 % grade)?

we recently were on the Mount Washington Cog Railway - the second steepest in the world at a 39 degree incline.  i believe that a 45 degree incline is a 100 percent grade but cannot figure out how to arrive at the correct grade for a 39 degree incline.



Re: angle to percent grade
by Robert Fogt on 06/07/04 at 17:23:23

The slope is the Tangent of the angle.

Slope is rise/run, and the % grade is 100 times the slope. So a slope of 1/1 would be a 100% grade, which is indeed a 45 degree angle.

So if you know the degree of the angle, just enter it into your scientific calculator then hit Tangent.

The Tangent of 39 degree angle is:

That is the slope, now multiply by 100 to get the % grade.
80.9784 %

Re: angle to percent grade
by Kim Pollock on 06/08/04 at 10:41:48

Thanks Robert -

I missed the part about multiplying by 100 - mystery solved!

Kim P

Go Back | Archive Index


Did you find us useful?

Please consider supporting the site with a small donation.

click here for more information


BookMark Us

It may come in handy.

Check out our Conversion Software for Windows.

Can't find something?
Try searching.

Are you bored?
Try the Fun Stuff.

Was this site helpful?
Link to Us | Donate