Running Pace & Splits – km and Mile Chart

Splits break a race into checkpoints so pacing becomes a plan instead of a guess. This calculator takes your goal time and distance, computes the average pace, then lays out split times at every kilometer or mile. Worked example: a 45-minute 10K requires 45 ÷ 10 = 4:30 min/km, so kilometer splits read 4:30, 9:00, 13:30… and the 5 km halfway mark is 22:30. Mile splits convert at 1.60934 km per mile: 4:30 min/km equals 7:15 min/mi. The chart also flags negative-split guidance — running the first half 5–10 seconds per km slower — which produces faster finishing times than starting hot: race pacing research consistently shows even-to-negative splits win.

1. 1

   Set goal time and distance

   Any race from 5 km to marathon, or a custom distance

2. 2

   Read average pace

   min/km, min/mi and speed in km/h and mph

3. 3

   Use the split chart

   Per-km or per-mile checkpoint times for race day

• 1

  Write key splits on your wrist or set auto-lap alerts

• 2

  Bank no more than 5 sec/km in the first half — banking 15+ usually backfires

• 3

  Practice at goal pace weekly for 4–6 weeks before race day

• Going out 15 sec/km faster than goal pace and dying at km 30

• Using GPS distance for splits on twisty courses — lap manually at markers

• Forgetting that marathon pace feels easy at km 5 and brutal at km 35

• Ignoring weather: above 20°C, add 3–5 sec/km to every target