Free Tool
Race Equivalence Calculator | Race Prediction
Race Equivalence Calculator - Compares race performances across distances using age-grading and distance factors
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 Equivalence Calculator
Compares race performances across distances using age-grading and distance factors.
Methodology
Compares race performances across distances using age-grading and distance factors. Determines if a 5K time is equivalent to a marathon time.
FAQ
How does this work?
Compares race performances across distances using age-grading and distance factors. Determines if a 5K time is equivalent to a marathon time.
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.