Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Running
Race Split Calculator
Plan your race pace by calculating per-mile or per-km splits from your goal finish time. Use it when targeting a specific finishing time for any race distance from 5K to marathon.
Fill in the required fields to see your result.
Running
Marathon Time Predictor
Predict your marathon finish time from a recent 5K, 10K, or half marathon result using empirical scaling factors tuned to typical recreational runners. Use it to set a realistic goal before your first marathon or to validate a training cycle.
Fill in the required fields to see your result.
Key differences
| Race Split Calculator | Marathon Time Predictor | |
|---|---|---|
| Category | Running | Running |
| Inputs required | 5 | 2 |
| Result | Average Pace per Kilometer (seconds) | Predicted Marathon Time (minutes) |
| What it does | Plan your race pace by calculating per-mile or per-km splits from your goal finish time. Use it when targeting a specific finishing time for any race distance from 5K to marathon. | Predict your marathon finish time from a recent 5K, 10K, or half marathon result using empirical scaling factors tuned to typical recreational runners. Use it to set a realistic goal before your first marathon or to validate a training cycle. |