Free half marathon pace calculator. Use your 13.1 finish time to estimate race pace and get VDOT-based training paces for easy, tempo, and threshold runs.
A half marathon is one of the best "fitness benchmarks" for endurance athletes. Use it to dial in tempo work and long-run pacing.
Use your half marathon finish time to get training paces for easy runs, tempo workouts, threshold intervals, and long runs.
Start from your current fitness (a recent race) and aim for a pace you can hold steadily. The calculator helps translate results into realistic pacing.
They can be close for many runners. Tempo pace is often a touch faster than half marathon pace, but the exact gap depends on your endurance.
| 5K time | VDOT | Easy | Marathon | Threshold | Interval | Rep |
|---|---|---|---|---|---|---|
| 15:00 | 69.6 | 3:45–4:30 | 3:23–3:42 | 3:15 | 2:56 | 2:32 |
| 17:30 | 58.2 | 4:20–5:12 | 3:54–4:17 | 3:46 | 3:23 | 2:56 |
| 20:00 | 49.8 | 4:54–5:53 | 4:26–4:51 | 4:16 | 3:51 | 3:19 |
| 22:30 | 43.4 | 5:29–6:34 | 4:57–5:25 | 4:46 | 4:18 | 3:43 |
| 25:00 | 38.3 | 6:03–7:14 | 5:28–5:59 | 5:16 | 4:45 | 4:06 |
| 27:30 | 34.2 | 6:37–7:53 | 5:59–6:33 | 5:46 | 5:13 | 4:30 |
| 30:00 | 30.8 | 7:11–8:32 | 6:30–7:06 | 6:16 | 5:40 | 4:54 |
| 32:30 | 28.0 | 7:44–9:10 | 7:01–7:39 | 6:46 | 6:07 | 5:17 |
| 35:00 | 25.6 | 8:17–9:48 | 7:31–8:12 | 7:15 | 6:34 | 5:41 |
The numbers on this page are computed with the same code as the TrainPace calculators, from these published methods. They are training guidance, not medical advice.
Every public page on this site has a Markdown mirror at the same path with a .md suffix (for example /calculator.md), and honors an Accept: text/markdown request header on the HTML URL. The calculations here are also available as callable tools through a free public MCP server — no account or API key.