How does this get your predicted time? The formula used for this calculator was devised by Pete Riegel in the late 70s. It has withstood the test of time as a formula as accurate as any out there for running. In the early 80s, Riegel refined it for other sports for an article entitled “Athletic Records and Human Endurance” published in American Scientist.
Does credit for the code in this tool belong to you? We found this a few years ago and do not know where it came from so, if it is yours, please contact us so we can properly credit you.