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"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.
A foot span is a term used in the roofing industry to calculate the area of a roof. It is necessary to calculate how many shingles per foot. This measurement will vary depending on the type of shingles used.
It is 0.087 feet = 1.05 inches, approx.
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.
2% grade is equal to a 1/4" per foot fall