← Tools
Race Equivalency Chart
Enter one race result to see equivalent effort times across all common distances, based on the Riegel formula.
::
Enter a time to see the result.
Uses the Riegel formula, T₂ = T₁ × (D₂/D₁)^1.06 (Riegel PS, "Athletic Records and Human Endurance", American Scientist 69 (1981): 285-290). Results assume the same fitness and racing conditions at both distances.