"Percent Slope" is a representation that uses the ratio between the rise and run to describe the triangle formed. "Degree slope" is the measure of the angle formed. You can simply take the percent and divide by 100 to get back to the real ratio and then take the inverse tan of that number to give you the degrees of slope.
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how to convert slope into percent grade
30% is steeper than 15% slope.
15%ramp is a rise of 15/100 = 0.15 slope angle is inverse tangent of this, or 8.53 degrees
It is a 300% slope!
16.6667%