1500m to 5K Conversion Calculator
Making the jump from 1500m to 5K means shifting from VO2max intervals and race tactics to threshold and tempo sessions. Enter your 1500m time and get a data-backed 5K target that accounts for how aerobic demands increase over the longer distance.
Quick answer: a 4:50 1500m converts to about 18:11 for the 5K (typical range 17:22 to 19:21).
1500m to 5K conversion table
Estimates only – individual results vary with training, conditions and event experience.
| 1500m time | Predicted 5K | Range |
|---|---|---|
| 3:45 | 14:06 | 13:28–15:01 |
| 3:53 | 14:35 | 13:55–15:31 |
| 4:00 | 15:03 | 14:22–16:01 |
| 4:08 | 15:31 | 14:49–16:31 |
| 4:15 | 15:59 | 15:16–17:01 |
| 4:23 | 16:27 | 15:43–17:31 |
| 4:30 | 16:56 | 16:10–18:01 |
| 4:38 | 17:24 | 16:37–18:31 |
| 4:45 | 17:52 | 17:04–19:01 |
| 4:53 | 18:20 | 17:31–19:31 |
| 5:00 | 18:48 | 17:58–20:01 |
| 5:08 | 19:17 | 18:25–20:31 |
| 5:15 | 19:45 | 18:52–21:01 |
| 5:23 | 20:13 | 19:19–21:31 |
| 5:30 | 20:41 | 19:46–22:01 |
| 5:38 | 21:10 | 20:13–22:31 |
| 5:45 | 21:38 | 20:40–23:01 |
| 5:53 | 22:06 | 21:07–23:31 |
| 6:00 | 22:34 | 21:33–24:01 |
| 6:08 | 23:02 | 22:00–24:31 |
| 6:15 | 23:31 | 22:27–25:01 |
| 6:23 | 23:59 | 22:54–25:31 |
| 6:30 | 24:27 | 23:21–26:01 |
How it works
The 1500m→5K conversion blends Riegel's power-law scaling with VDOT oxygen-cost validation. The 3.3x distance gap means the model must account for shifting energy systems from aerobic with strong anaerobic finish to aerobic at 95-100% VO2max. Where both distances fall within aerobic range, critical speed modeling adds a third reference point. The result is a predicted time with a confidence range.
Training advice
For accuracy, enter a recent all-out 1500m effort from the past 6-8 weeks. If training specifically for 5K, incorporate threshold and tempo sessions into your weekly schedule. The prediction shows current fitness potential; targeted training can improve it.
Frequently asked questions
How accurate is a 1500m to 5K prediction?
With a recent all-out 1500m time, predictions are typically within 2-5% of actual 5K performance. Accuracy improves when the 1500m effort is from the past 6-8 weeks under normal conditions.
What training should I do to reach my predicted 5K time?
Focus on threshold and tempo sessions. Your 1500m fitness provides the speed foundation — building aerobic at 95-100% VO2max capacity through progressive training is the key to hitting the target.
Can I use an old 1500m time for this prediction?
Recent times (within 6-8 weeks) give the most reliable predictions. Older results may not reflect your current fitness, especially if your training has changed significantly.