Race Time Estimator

Use the estimator below to translate a known race performance to a performance over any distance. The algoithm was devised by Pete Riegel, a research engineer and marathoner, and published in Runner's World, most recently by Owen Anderson in 1997. It has been widely used since then. The formula is T2 = T1 x (D2/D1)1.06 where T1 is the given time, D1 is the given distance, D2 is the distance to predict a time for, and T2 is the calculated time for D2.

Known Performance

Estimate For:

Predicted Time