Race Time Predictor

Calculate your potential race times across different distances using Riegel's endurance formula - a proven mathematical model trusted by coaches and athletes worldwide.

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How It Works

This calculator uses Riegel's endurance formula:

T2 = T1 × (D2/D1)1.06

Where:

  • T1 = Time for your known distance
  • D1 = Known distance
  • T2 = Predicted time for new distance
  • D2 = New distance
  • 1.06 = Fatigue factor