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How It Works
The running calculator uses the distance and finish time of your most recent race to approximate your current level of fitness. Your performance is the result of many factors, including the maximum rate at which your body can process oxygen, your lactate threshold, and the mechanical efficiency of your stride. The calculator lumps the effects of all these factors into a single variable called VDOT, using a method popularized by sports scientist Jack Daniels in his book Daniels' Running Formula.

A given VDOT value corresponds to successively slower average paces as race distance increases. For example, VDOT 40.0 represents a 7:45/mile pace for a 5K race (24:05 total time), but 8:02/mile pace (49:58 total time) for a 10K, with both performances indicating the same overall level of fitness. Once your current VDOT has been determined, it can be used to predict your race times at other distances. The closer the other distance is to the original race's distance, the more accurate the prediction will be. Due to differences in physiology and training, some people may be better at longer distance races than shorter ones or vice-versa, but the calculator should yield accurate results for most runners.

The recommended training paces are also determined from your current VDOT value. They correspond to the five primary training types as defined by Daniels: everyday easy runs, marathon pace runs, tempo (lactate threshold) runs, intervals, and repetitions. These training types and the purposes served by each are explained fully in Daniels' book.

The data for pace/time adjustments related to elevation, temperature, and wind speed are adapted from Daniels' chapter Utilizing Your Training Environment, in the 1st edition of his book. See the text for more information.

Running Calculator
Enter the distance and finish time of your most recent race
Time (hh:mm:ss):
Calculate predicted finish times at other common race distances
Calculate appropriate training paces
Calculate race pace from distance and time
Convert race distance to miles or kilometers
Calculate equivalent finish times at other altitudes for this race at
Calculate equivalent finish times at other temperatures for this race at
Calculate equivalent finish times at other course elevation profiles,
from this race with of total uphills and of total downhills
(optional: including a course with of uphills and of downhills)
Or enter a pace to convert
Pace (mm:ss):
Convert pace to
Calculate equivalent paces at other inclines for the given pace from the
Calculate equivalent paces at other windspeeds for the given pace with a

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