Race Time Predictor

Race Time Predictor

One honest race or time trial can predict your times at other distances. Enter the distance you ran and the time it took, and this predictor uses the well-known Riegel formula to estimate your 1500 m, 5K, 10K, 10-mile, half-marathon and marathon times, with the pace per kilometre for each. Predictions assume similar conditions and that you train appropriately for the longer events — they set realistic race targets and pacing.

Uses the Riegel formula (T2 = T1 × (D2/D1)^1.06). Predictions assume similar conditions and appropriate endurance training for the longer distance; without enough long-run preparation, real marathon times are usually slower than predicted.