Free Tool
Race Time Predictor | Race Prediction
Race Time Predictor - Riegel formula: T2 = T1 x (D2/D1)^1
Built by an engineer who chases finish lines and is obsessed with data. Thomas Prommer — technology executive who has worked with Google, Apple, Nike, Adidas, Netflix and other global brands. Also an Ironman finisher, HYROX Pro Division competitor, and marathon runner. These tools combine engineering rigor with real race experience.
Race Time Predictor
Riegel formula: T2 = T1 x (D2/D1)^1.
Methodology
Riegel formula: T2 = T1 x (D2/D1)^1.06. Predicts race times from known performance. More accurate for similar distances.
FAQ
How does this work?
Riegel formula: T2 = T1 x (D2/D1)^1.06. Predicts race times from known performance. More accurate for similar distances.
How accurate?
Predictions improve with similar race distances and recent performances.
What affects accuracy?
Training, weather, terrain, race day nutrition, and tapering all affect actual performance.
Should I use this for goal setting?
Yes, use as a starting point. Adjust based on training and conditions.
Predictions based on mathematical models. Actual performance varies.