Marathon & Half Marathon Race Time Predictor (Peter Riegel Formula)
Predict your Full Marathon (42.2K), Half Marathon (21.1K), and 10K finish times and required kilometer pace based on a recent 5K or 10K race result using the world-renowned Peter Riegel endurance equation.
Predicted Full Marathon Finish Time (Total Minutes)
Calculator Inputs
Predicted Full Marathon Finish Time (Total Minutes)
Required Marathon Pace (Minutes per km)
Predicted Half Marathon Time (Minutes)
Race Finish Time Projections Comparison (Minutes)
Athletic race pace projection model. Accurate conversion assumes adequate mileage preparation and marathon-specific aerobic training.
This tool is a mathematical wellness and fitness estimation model for general educational guidance only. The results do not constitute medical diagnosis, clinical advice, or treatment plans. Always consult a qualified physician or certified dietitian before starting any dietary regimen, exercise program, or making health decisions.
Calculation Methodology
Peter Riegel Endurance Equation: Predicted Time T2 = Known Time T1 * (Target Distance D2 / Known Distance D1)^1.06.
Frequently Asked Questions
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