Running Calculators
Predict your race times and pace
Race Time Predictor
Use this calculator to predict your race time based on a previous race result. This calculator uses Riegel's formula and assumes you have trained appropriately for the distance.
Enter time in HH:MM:SS or MM:SS format
About Riegel's Formula
This calculator uses Riegel's equation: T2 = T1 × (D2/D1)^1.06
This formula is most accurate for distances from 1 mile to Half Marathon. For distances above Half Marathon, it tends to be optimistic.