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Running Splits Calculator
Split times per km or mile for a target time.
4:59 /km
Average pace
8:01 /mi
Pace per mile
12.06 km/h
Speed
| Distance | Split | Elapsed |
|---|---|---|
| 1 km | 4:59 | 4:59 |
| 2 km | 4:59 | 9:57 |
| 3 km | 4:59 | 14:56 |
| 4 km | 4:59 | 19:54 |
| 5 km | 4:59 | 24:53 |
| 6 km | 4:59 | 29:52 |
| 7 km | 4:59 | 34:50 |
| 8 km | 4:59 | 39:49 |
| 9 km | 4:59 | 44:48 |
| 10 km | 4:59 | 49:46 |
| 11 km | 4:59 | 54:45 |
| 12 km | 4:59 | 59:43 |
| 13 km | 4:59 | 1:04:42 |
| 14 km | 4:59 | 1:09:41 |
| 15 km | 4:59 | 1:14:39 |
| 16 km | 4:59 | 1:19:38 |
| 17 km | 4:59 | 1:24:36 |
| 18 km | 4:59 | 1:29:35 |
| 19 km | 4:59 | 1:34:34 |
| 20 km | 4:59 | 1:39:32 |
| 21 km | 4:59 | 1:44:31 |
| 21.1 km | 0:29 | 1:45:00 |
Runs entirely in your browser. Nothing is sent anywhere.
How it works
- 1Enter your values.
- 2See the result update instantly as you type.
- 3Change any value to compare scenarios.
About this tool
Running Splits Calculator: Split times per km or mile for a target time. Type your numbers and the result is calculated instantly — no button to press, nothing to install. All math runs locally in your browser, so the values you enter are never sent anywhere.
Example
| Input | |
|---|---|
| Distance (km) | 21.0975 |
| Target time (h:mm:ss) | 1:45:00 |
| Split every | 1 km |
| Negative split (% faster 2nd half) | 0 |
| Result | |
| Average pace | 4:59 /km |
| Pace per mile | 8:01 /mi |
| Speed | 12.06 km/h |
How do I use the Running Splits Calculator?
Enter your values. See the result update instantly as you type. Change any value to compare scenarios.
Is the Running Splits Calculator free?
Yes. It is completely free with no sign-up, no usage limits and no watermark.
Is my data sent to a server?
No. Everything is calculated locally in your browser. Nothing you enter is uploaded, logged or stored.
Does it work on my phone?
Yes. It works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux — no app needed.