Race Time Predictor

Recently raced or ran a hard test? Enter your distance and time, and see your estimated time for the other classic distances — using the established Riegel formula, the same one most well-known prediction tools rely on.

Your result's distance

Your time

Hours

Minutes

Seconds

* An estimate, not a promise: it assumes you've also trained appropriately for the target distance. The bigger the jump in distance, the bigger the uncertainty — the marathon prediction in particular tends to be optimistic without matching preparation.

Sources

The scientific basis of this tool:

Riegel, P. S. (1981). Athletic records and human endurance. American Scientist, 69(3), 285–290. PubMed →