Tools / Health & family
Running pace calculator
Enter distance and time for your pace per km, speed and treadmill setting — plus predicted times for 5K, 10K, half and full marathon, and splits for each km.
Your file never leaves your device — everything runs in your browser
Predicted times
Riegel's formula — assumes suitable training.
Per-km splits
How to use it
- Pick or type the distance.
- Type the time (h:mm:ss or mm:ss).
- See your pace and race predictions.
Questions
Are predictions accurate?
Riegel's formula assumes you've trained for the longer distance; marathons usually come out a little slower if not.
Running in summer?
In UAE heat expect 20–40 s/km slower — run early or indoors.
Treadmill setting?
The km/h to set for the same pace.