Enter the vertical change on the calculator. For example, if a road increased in elevation by 1,000 feet over a 5,000 foot stretch, enter "1,000."
Push the division sign.
Enter the horizontal change on the calculator. For example, if a road increased in elevation by 1,000 feet over a 5,000 foot stretch, enter "5,000."
Push the multiplication sign. When you push it, the calculator will compute the incline as a decimal. In this example, when you push the multiplication sign, the calculator will display 0.2.
Enter "100" and push the equals sign to have the calculator display the percent incline. Completing this example, when you enter "100," push the equals sign, the calculator will show 20, meaning the road has a 20 percent incline.