Predict Your Time Calculator

Enter a distance you have recently run to predict your potential time at other distances.
 

How does this get your predicted time?
The formula used for this calculator is one 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. And now, the formula:

t2 = t1 * (d2 / d1)1.06

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