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  1. #1
    Veteran Member NewToy's Avatar
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    Jun 2005
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    Ohio
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    '05 Farmtrac 270DTC

    Default % Grade vs Degrees

    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

  2. #2
    Veteran Member NewToy's Avatar
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    '05 Farmtrac 270DTC

    Default % Grade vs Degrees

    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

  3. #3
    Epic Contributor jinman's Avatar
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    Feb 2001
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    Texas - Wise County - Sunset
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    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: % Grade vs Degrees

    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. [img]/forums/images/graemlins/smirk.gif[/img] [img]/forums/images/graemlins/laugh.gif[/img]

  4. #4
    Epic Contributor jinman's Avatar
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    Texas - Wise County - Sunset
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    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: % Grade vs Degrees

    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. [img]/forums/images/graemlins/smirk.gif[/img] [img]/forums/images/graemlins/laugh.gif[/img]

  5. #5
    Super Member RobS's Avatar
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    SW Michigan
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    John Deere 790

    Default Re: % Grade vs Degrees

    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 [img]/forums/images/graemlins/smile.gif[/img]

  6. #6
    Super Member RobS's Avatar
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    SW Michigan
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    John Deere 790

    Default Re: % Grade vs Degrees

    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 [img]/forums/images/graemlins/smile.gif[/img]

  7. #7
    Bronze Member
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    Jun 2004
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    ARKANSAS
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    Massey Ferguson TO 35

    Default Re: % Grade vs Degrees

    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.

  8. #8
    Bronze Member
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    Jun 2004
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    ARKANSAS
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    Massey Ferguson TO 35

    Default Re: % Grade vs Degrees

    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.

  9. #9
    Platinum Member
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    Mar 2003
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    Western Ohio
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    2001 Kubota B2910

    Default Re: % Grade vs Degrees

    Here's a LINK to a grade calculator.

  10. #10
    Platinum Member
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    Mar 2003
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    Western Ohio
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    2001 Kubota B2910

    Default Re: % Grade vs Degrees

    Here's a LINK to a grade calculator.

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