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Enter a completed distance to predict the time to complete a further distance.
Predict whether you will qualify for the Boston Marathon (2014 qualifying times)
Runners' Calc calculates:
-Predicts how long a longer distance will be based on a distance you already know you can complete
-Calculates, based off of age and sex, whether you will qualify for the Boston Marathon (using 2014 qualifying times)
This calculator is extremely lightweight and will run on even the slowest and oldest of devices.
The formula Runners' Calc uses to predict how fast you will complete a run was originally devised by Pete Riegel, a research engineer and marathoner, and published in Runner's World. It is a very accurate formula for predicting how fast you will run, but it is only that, a prediction.