Marathon Predictor Calculator
Riegel Formula Prediction
Formula
T2 = T1 × (D2 / D1)^1.06
Frequently Asked Questions
What is the Riegel formula?
The Riegel formula predicts race times using T2 = T1 × (D2/D1)^1.06, where T1 is your known time, D1 is the known distance, and D2 is the target distance. The exponent 1.06 accounts for the natural slowing over longer distances.
How accurate is the Riegel formula?
The Riegel formula is reasonably accurate for trained runners racing distances between 5K and marathon. It may be less accurate for untrained runners or for very short/long distances.
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