Slope can be calculated as a percentage which is calculated in much the same way as the gradient.  Rise over run equals % of slope.

Convert the rise and run to the same units then divide the rise by the run.  Multiply this number by 100 and you have percent of slope.  Example :  4" rise divided by 56" run =.071 x 100 or 7.1% slope.

Lets start by thinking about a slope you need to measure?  You will need 2-stakes, string, string level and a pocket tape.  The string level can be used to tie a string off in a level manner from stake to stake.  Then using the tape measure to measure down from level the difference to a point on each end of the string.  Then you need to measure the distance beween the two stakes. Taking the difference in the two elevations you measured, divide that figure by the length of the string you measured.   Now you have calculated the slope as percentage.

There are many products at Lasco, Inc. that can aid you in helping you figure out percent of slope.  Builders transits, builders automatic levels, rotating lasers, grade lasers or electronic smart levels, are all excellent products to help you figure out percent of slope.  