This calculator requires the use of Javascript enabled and capable browsers. Be aware that the term grade should not be confused with an angle. The grade is a ratio of vertical to horizontal distance. It is possible, though unrealistic, to have a grade that is 200%, straight up or straight down. A 0% grade is a level surface. By definition, a 100% grade is a one to one ratio of vertical to horizontal distance. This script is made up of two calculators. The first is designed to give the percent of grade change on highways located in mountain terrains. The calculation is good for inclines (uphill), sometimes called upgrades or declines (downhill), often called downgrades. It is based on how much vertical change in feet takes place, up or down, over a given horizontal distance. The horizontal distance is often difficult to determine as it is NOT based on driving distance (including curves in the road). It is based on straight line distance. The lower calculator is designed to give the actual distance change if you know the percentage and horizontal distance. Our example (in both calculators) is for a 1% downgrade (or incline). Over a 1 mile horizontal distance, if the elevation change is 52.8 feet, that is a 1% grade change. You may wish to use our metric version instead.
Version 1.2.8
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