Predict your race result - just enter a recent time from another distance
This calculator lets you input an actual race time to see what you should be capable of at another distance. It is adjusted for distance (ie its 10K prediction isn't just double your 5K time), but there are three caveats:
The formula was originally devised by Pete Riegel, a research engineer and marathoner, and published in Runner's World many moons ago by Owen Anderson in 1997. It has stood the test of time since then and has been widely used.
The formula is T2 = T1 x (D2/D1)1.06 where T1 is the given time, D1 is the given distance, D2 is the distance to predict a time for, and T2 is the calculated time for D2.
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