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100K Pace Calculator
The 100K is 100 km (62.1 miles · 62.14 miles). At an even 6:30 /km (10:28 /mile) it takes 10:50:00 — that is 9.23 km/h (5.74 mph). Enter your own target time below.
Pace and speed are derived from one exact figure — your speed in metres per second — so min/km, min/mile, km/h and mph all agree and round-trip exactly. 1 mile = 1609.344 m.
100K pace chart — finish time by pace
Every even pace from 3:00 to 8:00 per kilometre, with the 100K finish time it produces and the equivalent min/mile, km/h and mph.
| Pace /km | Pace /mile | Finish | km/h | mph |
|---|---|---|---|---|
| 3:00 | 4:50 | 5:00:00 | 20 | 12.4 |
| 3:15 | 5:14 | 5:25:00 | 18.5 | 11.5 |
| 3:30 | 5:38 | 5:50:00 | 17.1 | 10.7 |
| 3:45 | 6:02 | 6:15:00 | 16 | 9.94 |
| 4:00 | 6:26 | 6:40:00 | 15 | 9.32 |
| 4:15 | 6:50 | 7:05:00 | 14.1 | 8.77 |
| 4:30 | 7:15 | 7:30:00 | 13.3 | 8.28 |
| 4:45 | 7:39 | 7:55:00 | 12.6 | 7.85 |
| 5:00 | 8:03 | 8:20:00 | 12 | 7.46 |
| 5:15 | 8:27 | 8:45:00 | 11.4 | 7.1 |
| 5:30 | 8:51 | 9:10:00 | 10.9 | 6.78 |
| 5:45 | 9:15 | 9:35:00 | 10.4 | 6.48 |
| 6:00 | 9:39 | 10:00:00 | 10 | 6.21 |
| 6:15 | 10:04 | 10:25:00 | 9.6 | 5.97 |
| 6:30 | 10:28 | 10:50:00 | 9.23 | 5.74 |
| 6:45 | 10:52 | 11:15:00 | 8.89 | 5.52 |
| 7:00 | 11:16 | 11:40:00 | 8.57 | 5.33 |
| 7:15 | 11:40 | 12:05:00 | 8.28 | 5.14 |
| 7:30 | 12:04 | 12:30:00 | 8 | 4.97 |
| 7:45 | 12:28 | 12:55:00 | 7.74 | 4.81 |
| 8:00 | 12:52 | 13:20:00 | 7.5 | 4.66 |
100K splits — every kilometre
Even-pace splits for a 10:50:00 100K (6:30 /km): the cumulative time on the clock as you pass each 5 km marker.
| Marker | Split | Cumulative |
|---|---|---|
| 5 km | 32:30 | 32:30 |
| 10 km | 32:30 | 1:05:00 |
| 15 km | 32:30 | 1:37:30 |
| 20 km | 32:30 | 2:10:00 |
| 25 km | 32:30 | 2:42:30 |
| 30 km | 32:30 | 3:15:00 |
| 35 km | 32:30 | 3:47:30 |
| 40 km | 32:30 | 4:20:00 |
| 45 km | 32:30 | 4:52:30 |
| 50 km | 32:30 | 5:25:00 |
| 55 km | 32:30 | 5:57:30 |
| 60 km | 32:30 | 6:30:00 |
| 65 km | 32:30 | 7:02:30 |
| 70 km | 32:30 | 7:35:00 |
| 75 km | 32:30 | 8:07:30 |
| 80 km | 32:30 | 8:40:00 |
| 85 km | 32:30 | 9:12:30 |
| 90 km | 32:30 | 9:45:00 |
| 95 km | 32:30 | 10:17:30 |
| 100 km | 32:30 | 10:50:00 |
100K splits — every mile
The same 10:50:00 100K broken into 5-mile splits (10:28 /mile).
| Marker | Split | Cumulative |
|---|---|---|
| 8.05 km | 52:18 | 52:18 |
| 16.1 km | 52:18 | 1:44:36 |
| 24.1 km | 52:18 | 2:36:55 |
| 32.2 km | 52:18 | 3:29:13 |
| 40.2 km | 52:18 | 4:21:31 |
| 48.3 km | 52:18 | 5:13:49 |
| 56.3 km | 52:18 | 6:06:08 |
| 64.4 km | 52:18 | 6:58:26 |
| 72.4 km | 52:18 | 7:50:44 |
| 80.5 km | 52:18 | 8:43:02 |
| 88.5 km | 52:18 | 9:35:20 |
| 96.6 km | 52:18 | 10:27:39 |
| Finish (100 km) | 22:21 | 10:50:00 |
100K race-time predictions (Riegel estimate)
If your 100K is worth 10:50:00, the Riegel formula estimates these equivalent times at other distances. These are estimates — real results depend on training, terrain and pacing.
| Distance | Predicted | Pace /km | Pace /mile |
|---|---|---|---|
| 1500 m | 7:35 | 5:03 | 8:08 |
| 3000 m | 15:48 | 5:16 | 8:29 |
| 1 Mile | 8:10 | 5:04 | 8:10 |
| 5K | 27:09 | 5:26 | 8:44 |
| 10K | 56:37 | 5:40 | 9:07 |
| 15K | 1:27:01 | 5:48 | 9:20 |
| 10 Mile | 1:33:45 | 5:50 | 9:22 |
| Half Marathon | 2:04:55 | 5:55 | 9:32 |
| 30K | 3:01:25 | 6:03 | 9:44 |
| Marathon | 4:20:26 | 6:10 | 9:56 |
| 50K | 5:11:46 | 6:14 | 10:02 |
| 50 Mile | 8:36:16 | 6:25 | 10:20 |
| 100 Mile | 17:56:22 | 6:41 | 10:46 |
How 100K pace is calculated
Pace is simply time ÷ distance. This page works it out exactly: it converts your 100K into metres and your time into seconds, divides to get one speed in metres per second, then expresses that single number as min/km, min/mile, km/h and mph. Because a kilometre is exactly 1000 m and a mile exactly 1609.344 m, the four figures always agree and convert back to machine precision. Only the Riegel predictions above are estimates.
FAQ
What is a good 100K time?
"Good" depends entirely on the runner, but a useful reference point is even pacing. At 6:30 /km (10:28 /mile) a 100K takes 10:50:00. Enter your own target above and the calculator shows the exact pace and speed you need; the pace chart below lists finish times for every pace from 3:00 to 8:00 /km.
How many kilometres is a 100K?
A 100K is 100 km, which is 62.1 miles (62.14 miles). A mile is exactly 1609.344 m, so the conversion is exact rather than rounded.
What pace do I need for a 10:50:00 100K?
To finish a 100K in 10:50:00 you hold 6:30 per kilometre, which is 10:28 per mile, or 9.23 km/h (5.74 mph). The split table below shows the clock at every kilometre and mile for that pace.
How are the 100K race-time predictions calculated?
They use the Riegel formula, t₂ = t₁ × (d₂ / d₁)^1.06, a published 1977 model that scales a known result to another distance. It is an estimate, not a guarantee — real times depend on training, terrain, heat and pacing — and it is the only estimate on this page. Every pace and speed conversion here is exact.