Background photo - U.S. #5 Pikes Peak CO.
H = ending elevation minus starting elevation in meters.
D = total distance traveled in meters.
T = Height in meters.
^ = multiply that number by itself (i.e., square the number)
* = multiply
Note: Only add T-1000 if that number is greater than zero.
An example of the formula: Using our Garmin ride data from our June 8, 2014 Mauna Kea climb:
We created a spreadsheet to calculate the climb index, but for our chart, we used the formula embeded in the excellent riding gps site RideWithGPS.com . RideWithGPS has a function that automatically calculates the FIETS Index for any route plotted on their website. Here is the link for the example of that for Mauna Kea. (note that our hand calculation is a bit different than the automatic calculation of RideWithGPS but that is likely because of the common variant between using websites to plot rides as compared to the actual on-road data we capture off our GPS devise during the ride (truly, we are just not sure which is most accurate, but they are very, very close - within 2%; the FIETS index in RideWithGPS is located to the right of the map under the heading "metrics.")