Magic Mile
Galloway Race Predictor
Predict 5K, 10K, half marathon, and marathon times from a single all-out mile using Galloway's method.
Magic Mile Race Predictor
Jeff Galloway's pace-trial method: turn one all-out mile into 5K, 10K, half marathon, and marathon predictions.
Why a Mile?
A mile is short enough to give a maximal effort, long enough to involve aerobic capacity, and standardized enough to track over time. Running it monthly produces a clean fitness benchmark that doubles as a race predictor.
When the Predictions Break Down
Without specific endurance training, marathon predictions overestimate. A 6:00 mile in someone who has never run more than 8 miles in a session does not translate to a 4:18 marathon — the long-run training simply is not there. Use the prediction as a ceiling, not a guaranteed time.
Formula
Galloway Pace Adjustments
Medical Disclaimer
Predictions assume appropriate training for the target distance. A great mile time without long-run endurance will not translate into the predicted marathon time.