% Grade vs Degrees

   / % Grade vs Degrees #1  

NewToy

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Jun 14, 2005
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1,043
Location
Ohio
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'05 Farmtrac 270DTC
Anyone know what the difference between % of a grade as opposed to how many degrees the grade is? I always see the signs on the hiway saying 5% grade and it sure seems awfully steep.

Thanks,
John
 
   / % Grade vs Degrees
  • Thread Starter
#2  
Anyone know what the difference between % of a grade as opposed to how many degrees the grade is? I always see the signs on the hiway saying 5% grade and it sure seems awfully steep.

Thanks,
John
 
   / % Grade vs Degrees #3  
I believe % grade is a measure of the rise to the run or how much the roadway rises compared to the length. If a roadway rose 1' for each 1' of length, that would be 100% grade (or the same as 45°). A 5% grade would rise 1' for each 20' of length or about 2-1/2°. When you are looking into a grade, your perspective is distorted. If you looked at the grade from the side, it would look a lot less imposing.

Disclaimer: There is a good possibility that my explanation is completely bogus, it's just my own understanding or lack of same. /forums/images/graemlins/smirk.gif /forums/images/graemlins/laugh.gif
 
   / % Grade vs Degrees #4  
I believe % grade is a measure of the rise to the run or how much the roadway rises compared to the length. If a roadway rose 1' for each 1' of length, that would be 100% grade (or the same as 45°). A 5% grade would rise 1' for each 20' of length or about 2-1/2°. When you are looking into a grade, your perspective is distorted. If you looked at the grade from the side, it would look a lot less imposing.

Disclaimer: There is a good possibility that my explanation is completely bogus, it's just my own understanding or lack of same. /forums/images/graemlins/smirk.gif /forums/images/graemlins/laugh.gif
 
   / % Grade vs Degrees #5  
Percent grade is just the rise over run. A 45 degree slope is 100% as the rise and run are the same. Your 5% grade is 5 feet in 100 which calculates to 2.86 degrees. The formula is Angle = ATAN (Rise/Run).

If you think 5% feels steep, try that 100% grade sometime /forums/images/graemlins/smile.gif
 
   / % Grade vs Degrees #6  
Percent grade is just the rise over run. A 45 degree slope is 100% as the rise and run are the same. Your 5% grade is 5 feet in 100 which calculates to 2.86 degrees. The formula is Angle = ATAN (Rise/Run).

If you think 5% feels steep, try that 100% grade sometime /forums/images/graemlins/smile.gif
 
   / % Grade vs Degrees #7  
Here is how I figure 5% grade. 5/100=.05. Then take .05 and inverse tan which gives you 2.862405 degrees. Hope this helps.
 
   / % Grade vs Degrees #8  
Here is how I figure 5% grade. 5/100=.05. Then take .05 and inverse tan which gives you 2.862405 degrees. Hope this helps.
 
   / % Grade vs Degrees #9  
Here's a LINK to a grade calculator.
 
   / % Grade vs Degrees #10  
Here's a LINK to a grade calculator.
 

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