Race Time Predictor
Predict your finish times for distances like 5K, 10K, Half Marathon, and Marathon. Calculate your required pacing strategy based on recent race results.
Predict Your Race Potential
Enter a recent race distance and time to project your performance at longer or shorter target distances.
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The Science of Endurance Fatigue Curves
Human aerobic capacity exhibits a highly predictable degradation curve as duration increases. While speed decreases by approximately 5-6% for every doubling of distance in elite runners, intermediate and beginner runners might experience a 7-9% degradation. Riegel\'s standard exponent of 1.06 represents the average decay across recreational athletes, helping runners establish realistic pacing goals and avoid starting too fast on race day.
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VO₂ Max Calculator
Estimate your cardiovascular fitness and VO₂ Max using standard fitness tests.
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Find your 5 heart rate training zones for fat burn, aerobic and max effort.
Need Personal Guidance? Talk to a Fitness Trainer.
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Frequently Asked Questions
Disclaimer: Race predictions are mathematical guidelines. Actual results depend on temperature, course topography, drafting, shoe choices, and individual hydration levels. Full disclaimer →