Grade = (rise ÷ run) * 100 grade = (396 ÷ 15,840) * 100 = 2.5%Ĭalculating Grade By Measuring The Road Distance One way to calculate the grade of a hill is with a map that shows the altitudes of locations.įor example, you've measured out a distance of 3 miles (run) with a change in altitude of 396 feet (rise).įirst, the units must be made consistent, so we convert 3 miles to 15,840 feet. Stating this as an angle of 2.8624 degrees doesn't give you much of an idea how the rise compares to the run. Stating this as a percentage, whatever horizontal distance you travel, your altitude increases by 5% of that distance. Stating a ratio such as 1 in 20 tells you immediately that for every 20 horizontal units traveled, your altitude increases 1 unit. Of these 3 ways, slope is expressed as a ratio or a grade much more often than an actual angle and here's the reason why. Slope, tilt or inclination can be expressed in three ways:ġ) As a ratio of the rise to the run (for example 1 in 20)Ģ) As an angle (almost always in degrees)ģ) As a percentage called the " grade" which is the (rise ÷ run) * 100. Bicyclists, motorists, carpenters, roofers and others either need to calculate slope or at least must have some understanding of it.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |