Set the inputs
Seconds, M:SS or H:MM:SS. Example: 20:00.
Your pace
Illustrative example · 5K in 20:00
per mile
- Per km
- 4:00
- Per 400m
- 1:36
pace = time ÷ distance. All paces and splits assume even speed over the measured distance. They are arithmetic equivalents, not race predictions. Displayed times round to the nearest second; calculations use unrounded values.
5K Split Chart
4 checkpoints; even pace 6:26 per mile
Equivalent event times
| Event | Even-pace time |
| 400m | 1:36 |
| 800m | 3:12 |
| 1500m | 6:00 |
| Mile | 6:26 |
| 5K | 20:00 |
| 10K | 40:00 |
What If Scenarios
6:11/mi
19:13
6:16/mi
19:29
6:21/mi
19:44
6:31/mi
20:16
6:36/mi
20:31
6:41/mi
20:47
Training Paces
9:10
Recovery runs8:19
Steady state7:28
Threshold effort6:58
Race simulation6:38
10K effort6:08
3K-5K effortNegative Split Strategy
Even Split
First Half
10:00
6:26/miSecond Half
10:00
6:26/miConservative
First Half
10:12
6:34/miSecond Half
9:48
6:19/miAggressive Negative
First Half
10:24
6:42/miSecond Half
9:36
6:11/miHow You Compare
Sub-20 5K
6:26/mi • 20:00Sub-40 10K
6:26/mi • 40:00Boston 2027 standard (M 18-34; not entry cutoff)
6:40/mi • 2:55:00Sub-3 Marathon
6:52/mi • 3:00:00Assefa Marathon WR (W-only)
5:11/mi • 2:15:41Chepngetich Marathon WR (W, mixed)
4:57/mi • 2:09:56Pace Band
6:26
12:52
19:19
20:00
Every split here assumes perfectly even pacing. Real races drift with terrain, wind and fatigue — use the negative-split strategies above to build in a realistic cushion.