Race Time Predictor
Predict your finish time for a 5K, 10K, half marathon or marathon from a recent race, using the Riegel formula, with the pace you’d need.
Result
Predictions assume you train for the longer distance. Marathon predictions are often optimistic for newer runners.
Predicted finish time
1:55:00
- Pace per mile
- 8:46
- Pace per kilometer
- 5:27
Common questions
How accurate is the Riegel formula?
It’s usually within a few percent for distances from the mile to the half marathon. For the marathon, many runners finish 5% to 10% slower than predicted unless they’ve done high weekly mileage.