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Riegel's Time Predictor
Distance you've run
MR
Time you've run
Distance to predict
LIST
PREDICT
About Riegel's time predictor formula;
Common Distances
5K (5.0 km)
10K (10.0 km)
Half Marathon (21.0975 km)
Marathon (42.195 km)
Ultra 50K (50.0 km)
Ultra 100K (100.0 km)