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64 Threadmills: How do I convert between % incline and degrees?




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This article is from the Running FAQ, by Ozzie Gontang with numerous contributions by others.

64 Threadmills: How do I convert between % incline and degrees?

Remember your trigonometry. Grade (or incline) = rise/run, opposite/
adjacent, height/length, or whatever you want to call it. For percent
grade, multiply this by 100.

degrees = arctan((percent grade)/100)
percent grade = tan(degrees) * 100

Thus, 1% incline is a mere .57 degrees, 5% incline is 2.9 degrees, 10%
incline is 5.7 degrees, and 15% incline is 8.5 degrees.

 

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