Race time prediction

Enter a race you've already run (distance and time) and the distance to predict: estimate the time with the Riegel formula.

Known race · km

min

sec

Distance to predict · km

What it's for

You ran a 10K and want to know your possible half-marathon time? The Riegel formula predicts your time over a different distance from a known performance.

Note

It's an estimate assuming proper training for the new distance. The closer the two distances, the more reliable the prediction.