Enter the elevation change and the horizontal distance into the calculator to determine the fall percentage. This calculator helps in assessing the steepness or slope of a terrain.

Fall Percentage Formula

The following formula is used to calculate the fall percentage:

FP = (EC / HD) * 100


  • FP is the fall percentage (%)
  • EC is the elevation change (feet)
  • HD is the horizontal distance (feet)

To calculate the fall percentage, divide the elevation change by the horizontal distance and then multiply by 100 to convert it to a percentage.

What is Fall Percentage?

Fall percentage is a way of expressing the steepness or slope of a terrain. It is calculated by dividing the change in elevation by the horizontal distance over which the change occurs, and then converting this ratio into a percentage. This measurement is commonly used in civil engineering, construction, and road design to ensure safety and adherence to regulations.

How to Calculate Fall Percentage?

The following steps outline how to calculate the Fall Percentage.

  1. First, determine the elevation change (EC) in feet.
  2. Next, determine the horizontal distance (HD) in feet over which the elevation change occurs.
  3. Use the formula from above = FP = (EC / HD) * 100.
  4. Finally, calculate the Fall Percentage (FP).
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

elevation change (EC) = 15 feet

horizontal distance (HD) = 200 feet