Calculate Mile & Kilometer Splits
Get even split times for any race distance. See per-mile and per-km pace for your target finish time.
Even Splits vs Negative Splits
Even splits mean running every mile at the same pace — the most efficient race strategy for most runners. Negative splits mean running the second half faster than the first — the strategy used by most marathon world record holders. The worst strategy: going out too fast (positive splits). Starting 30 seconds/mile faster than goal pace often costs 2+ minutes by the finish due to fatigue.
Common Race Paces
5K: Beginners 10-12 min/mile, intermediate 8-10, advanced 6-8. Half Marathon: Beginners 11-13, intermediate 9-10, advanced 7-8. Marathon: Beginners 11-13, intermediate 9-10, advanced sub-8. Average US marathon finish: 4:30:00 (~10:18/mile). Qualifying for Boston: 3:00-3:30 depending on age (~6:52-8:00/mile).
The marathon "wall" at mile 20 is not inevitable — it happens because runners deplete glycogen stores by going out too fast. Even-split or negative-split strategies, combined with proper fueling (30-60g carbs/hour during the race), can eliminate the wall entirely. Most 3-hour marathoners feel strongest in the final miles because they paced correctly.
