Running Splits Calculator
Calculate per-mile or per-kilometer splits for any race distance.
Enter target finish time and get even split pacing.
Race Splits
Running splits break your target finish time into per-mile or per-kilometer segments.
Even split pacing:
Split time = Total time / Distance
Common race distances:
- 5K: 3.1 miles / 5 km
- 10K: 6.2 miles / 10 km
- Half Marathon: 13.1 miles / 21.1 km
- Marathon: 26.2 miles / 42.2 km
Pacing strategies:
- Even splits: Same pace every mile/km. Best for most runners.
- Negative splits: Slightly faster in the second half. Used by experienced runners.
- Positive splits: Slowing down in the second half. Common but not ideal.
Tips:
- Start 5–10 seconds per mile slower than target pace to conserve energy
- The first mile often feels easy but is frequently run too fast
- GPS watches can drift, so use timing mats at aid stations to check pace