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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

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