Enter a recent run and we’ll estimate your times and paces at other distances using the Riegel formula. You can switch between standalone and triathlon off-the-bike predictions.
This tells the calculator whether to treat your result as a fresh run or a triathlon/brick run. It converts between them using an ~12% slowdown for off-the-bike running.
Off-the-bike mode applies an ~12% slowdown to approximate typical triathlon run splits vs standalone running.
Higher values predict more slowdown as distance increases; lower values give more conservative fatigue.
Based on Peter Riegel’s time–distance equation for endurance events. Predictions assume similar conditions, terrain and training.
Mode: Standalone running predictions. Input: Standalone run time.
| Distance | Predicted Time | Pace / mile | Pace / km | Pace / 400m |
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