"Rise per run" or something like that is the tangent function. Use your scientific calculator to calculate tan 30. Be sure to set your calculator to degrees first. Then - since you want the result in inches per foot - multiply this tangent by 12.
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It is 0.087 feet = 1.05 inches, approx.
Oh, dude, you're hitting me with some math now? Okay, okay. So, a 2 percent slope is like 2 inches of rise per 100 inches of run. And since there are 12 inches in a foot, you just divide 100 by 12 to get around 8.3 feet per foot on a 2 percent slope. Math is fun, right?
To convert .25 inch per foot into degrees or percent slope, you first need to determine the rise over the run. In this case, .25 inch per foot is equivalent to a rise of .25 inches for every 12 inches of horizontal distance (1 foot). To convert this into degrees, you can use the arctangent function: arctan(.25/12) ≈ 1.19 degrees. To convert this into percent slope, you can use the formula: percent slope = (rise / run) x 100. In this case, it would be (.25/12) x 100 ≈ 2.08% slope.
The slope can be remembered as "rise over run". When the slope is an integer, it means that the rise over run is positive.
It is the slope.