Understanding This Calculator
Even-pacing — running each mile at the same speed — is the pacing strategy most coaches recommend for marathon success, since positive splits (slowing in the second half) are far more common than negative splits and usually signal starting too fast.
This calculator takes your goal finish time and divides it evenly across the official marathon distance (26.21875 miles / 42.195 km) to give you the exact per-mile and per-km pace to target, plus checkpoint splits at 10K and the half-marathon mark.
- goal time your target finish time in seconds
- 26.21875 official marathon distance in miles
| Goal Time | Pace/mile | Pace/km |
|---|---|---|
| 3:00:00 | 6:52 | 4:16 |
| 3:30:00 | 8:01 | 4:59 |
| 4:00:00 | 9:09 | 5:41 |
| 5:00:00 | 11:27 | 7:07 |
Frequently Asked Questions
Should I really run every mile at exactly the same pace?
Even pacing is the goal on average — most runners naturally vary ±5-10 seconds per mile with terrain, but avoiding a fast start is the key principle, since early over-effort compounds into late-race slowdowns.
How do I use the 10K and half-marathon splits?
Check your watch at those distance markers during the race — if you’re significantly ahead of the split, you’re likely going out too fast for your goal.