5K to Half Marathon Time Prediction
Use these representative examples to estimate how a known 5K result may translate to Half Marathon.
Representative prediction examples
| Input time | Predicted time | Predicted pace /km |
|---|---|---|
| 20:00 | 1:32:00 | 4:22 /km |
| 22:00 | 1:41:12 | 4:48 /km |
| 25:00 | 1:55:00 | 5:27 /km |
| 28:00 | 2:08:48 | 6:06 /km |
When the prediction is most useful
Predictions tend to be stronger when the source race is recent and your training already supports the target distance.
When the model can be off
Limited long-run durability, heat, hills, and fueling mistakes often make the real result slower than the model.
Race prediction FAQ
The prediction gets better when your training volume and race-specific durability match the target distance.
Heat, hills, wind, fueling, and limited long-run work can all push the real result away from the model.
Yes. Use the related links below to jump into the relevant pace-chart pages.