The table below shows some common slopes. Therefore, the inverse-tangent of the rise divided by the run will give the angle. The tangent of a given angle (in degrees) is equal to the rise divided by the run. The most complicated way to calculate slope is in degrees and it requires a bit of high-school math. 083 x 100 = an 8.3% slope.Ĭalculating a Slope in Degrees Calculating a Slope in Degrees For instance, 3" rise divided by 36" run =. Multiply this number by 100 and you have the percentage slope. Convert the rise and run to the same units and then divide the rise by the run. Slope percentage is calculated in much the same way as the gradient. This is read as a "one in twelve slope."Ĭalculating the Slope Percentage Calculating Slope Percentage For instance, if you travel 3 inches vertically and 3 feet (36 inches) horizontally, the slope would be 3:36 or 1:12. Slope gradients are written as Y:X, where Y is a single unit in rise and X is the run. Calculating a Slope Gradient Calculating a Slope Gradient There are three different ways to indicate the slope of a surface relative to the horizontal plane: degrees, gradient, and percentage.
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