Marathon Pace Calculator
This marathon pace calculator turns your goal finish time into a target pace and a per-kilometre or per-mile split schedule, with even or negative-split plans for race day.
How it works
Your target pace is simply your goal time divided by the race distance. A marathon is 42.195 km (26.2 miles), so a 4-hour goal is 14,400 seconds ÷ 42.195 km ≈ 341 seconds per kilometre, or about 5:41 / km.
The split schedule then lays out the cumulative time you should see at each kilometre or mile marker. Choose even splits to hold one pace throughout, or negative splits to run the first half about 2% slower than average and the second half about 2% faster — the totals match either way.
Worked example
For a 4:00:00 marathon you need roughly 5:41 / km (≈ 9:09 / mile). On an even plan the early kilometre splits read 0:05:41 at 1 km, 0:11:22 at 2 km and 0:17:03 at 3 km, building steadily to 4:00:00 at the 42.195 km finish.
Goal time → required marathon pace
Target pace for common marathon goal times:
| Goal time | Pace / km | Pace / mile |
|---|---|---|
| 3:00:00 | 4:16 | 6:52 |
| 3:30:00 | 4:59 | 8:01 |
| 4:00:00 | 5:41 | 9:09 |
| 4:30:00 | 6:24 | 10:18 |
| 5:00:00 | 7:07 | 11:27 |
Paces rounded to the nearest second over the full 42.195 km.
Even vs negative splits
Even effort is the most reliable way to hit a marathon goal: most fast times are run as even or very slightly negative splits. Starting too fast borrows from the back half of the race, where fatigue makes every second harder to claw back. To explore splits at any single pace, see the Pace Calculator, and to estimate a realistic goal from a recent race, try the Race Time Predictor.
Frequently asked questions
What pace do I need for my goal marathon time?
- Divide your goal finish time by the distance: a 4:00:00 marathon over 42.195 km needs about 5:41 per kilometre (roughly 9:09 per mile). Enter your goal time above to see the exact target pace and full split schedule.
What are even and negative splits?
- Even splits mean running every segment at the same pace. Negative splits mean running the second half faster than the first — a common strategy to avoid going out too hard and fading late in the race.
Should I run even or negative splits?
- Most coaches recommend even effort, which on a flat course looks like even or slightly negative splits. Starting 1–2% slower than goal pace for the first few miles, then settling in, leaves a margin for the tough final 10 km.
How do I pace the first mile of a marathon?
- Start deliberately slower than goal pace — adrenaline and crowded corrals make it easy to surge. Aim for the first mile or two a few seconds per mile slower, then ease into your target pace once you have space.
What marathon time is a Boston qualifier?
- Boston Marathon qualifying standards vary by age and sex (for example, around 3:00 for younger men and 3:30 for younger women), and a buffer under the standard is usually needed to get in. Check the current official standards before targeting a qualifier.
Related calculators
Disclaimer. These are estimates for race planning; adjust for terrain, heat and your current fitness. Not medical advice.