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Calculator

Running Race Time Predictor

An easy to use calculator to predict a race finish time based on a previously completed race.

This calculator will help you to predict your race time based on a previously completed race. It is based on the formula created by Peter Riegel. For details on the formula and the math read the how to guide .

Input Data

Completed Race 5 km
10 km
half marathon
marathon
Finish Time hour
min
sec
Target Race 5 km
10 km
half marathon
marathon
Riegel Constant

Results

Predicted Time : : hours