3K to 5K Conversion Calculator
Convert your 3K performance to a realistic 5K prediction. This tool uses Riegel scaling, VDOT estimation, and critical speed modeling — calibrated for the physiological gap between 3K (aerobic) and 5K (aerobic at 95-100% VO2max).
Quick answer: a 10:40 3000m converts to about 18:36 for the 5K (typical range 18:04 to 19:20).
3000m to 5K conversion table
Estimates only – individual results vary with training, conditions and event experience.
| 3000m time | Predicted 5K | Range |
|---|---|---|
| 8:20 | 14:32 | 14:07–15:06 |
| 8:35 | 14:58 | 14:32–15:34 |
| 8:50 | 15:24 | 14:58–16:01 |
| 9:05 | 15:50 | 15:23–16:28 |
| 9:20 | 16:16 | 15:48–16:55 |
| 9:35 | 16:42 | 16:14–17:22 |
| 9:50 | 17:09 | 16:39–17:50 |
| 10:05 | 17:35 | 17:05–18:17 |
| 10:20 | 18:01 | 17:30–18:44 |
| 10:35 | 18:27 | 17:56–19:11 |
| 10:50 | 18:53 | 18:21–19:38 |
| 11:05 | 19:19 | 18:46–20:05 |
| 11:20 | 19:45 | 19:12–20:33 |
| 11:35 | 20:12 | 19:37–21:00 |
| 11:50 | 20:38 | 20:03–21:27 |
| 12:05 | 21:04 | 20:28–21:54 |
| 12:20 | 21:30 | 20:53–22:21 |
| 12:35 | 21:56 | 21:19–22:49 |
| 12:50 | 22:22 | 21:44–23:16 |
| 13:05 | 22:48 | 22:10–23:43 |
| 13:20 | 23:15 | 22:35–24:10 |
| 13:35 | 23:41 | 23:00–24:37 |
| 13:50 | 24:07 | 23:26–25:05 |
| 14:05 | 24:33 | 23:51–25:32 |
How it works
The 3K→5K conversion blends Riegel's power-law scaling with VDOT oxygen-cost validation. Because 3K and 5K are relatively close in distance, the conversion is highly reliable — typically within 1-2% accuracy. 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 3K 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 3K to 5K prediction?
With a recent all-out 3K time, predictions are typically within 1-2% of actual 5K performance. Accuracy improves when the 3K 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 3K 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 3K 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.