300m to 1000m Conversion Calculator
The jump from 300m to 1000m crosses the anaerobic-aerobic divide. Enter your 300m time and see how your raw speed translates when mixed capacity becomes the limiting factor — with adjustments for the physiological shift.
Quick answer: a 40.00 s 300m converts to about 2:50 for the 1000m (typical range 2:42 to 3:03).
300m to 1000m conversion table
Estimates only – individual results vary with training, conditions and event experience.
| 300m time | Predicted 1000m | Range |
|---|---|---|
| 34.00 | 2:24 | 2:17–2:35 |
| 35.00 | 2:29 | 2:21–2:40 |
| 36.00 | 2:33 | 2:25–2:44 |
| 37.00 | 2:37 | 2:29–2:49 |
| 38.00 | 2:42 | 2:33–2:54 |
| 39.00 | 2:46 | 2:37–2:58 |
| 40.00 | 2:50 | 2:42–3:03 |
| 41.00 | 2:55 | 2:46–3:08 |
| 42.00 | 2:59 | 2:50–3:12 |
| 43.00 | 3:03 | 2:54–3:17 |
| 44.00 | 3:08 | 2:58–3:22 |
| 45.00 | 3:12 | 3:02–3:26 |
| 46.00 | 3:16 | 3:06–3:31 |
| 47.00 | 3:21 | 3:10–3:36 |
| 48.00 | 3:25 | 3:15–3:40 |
| 49.00 | 3:29 | 3:19–3:45 |
| 50.00 | 3:34 | 3:23–3:50 |
| 51.00 | 3:38 | 3:27–3:54 |
| 52.00 | 3:42 | 3:31–3:59 |
How it works
The 300m to 1000m conversion uses Riegel's power-law formula with event-specific exponents, cross-validated by VDOT oxygen-cost modeling. The 3.3x distance gap requires careful modeling of the shift from anaerobic glycolysis to mixed. The result includes a confidence range reflecting extrapolation uncertainty.
Training advice
For the most accurate prediction, enter a recent all-out 300m effort. If preparing specifically for 1000m, incorporate sustained anaerobic power into your weekly routine. The prediction reflects current fitness — structured training targeting mixed capacity can help you beat it.
Frequently asked questions
How accurate is a 300m to 1000m prediction?
With a recent all-out 300m, predictions are typically within 2-5% of actual 1000m performance. The larger distance gap introduces some uncertainty from different energy system demands.
What training improves my 1000m from a 300m base?
Focus on sustained anaerobic power. Your 300m provides speed/power that must be complemented with sustained anaerobic power. Progressive, specific training over 8-16 weeks can push you past the predicted time.
Should I enter more than one race time?
This page uses your 300m as the primary input. For a more comprehensive multi-distance analysis, use the full calculator on the homepage — entering 2-3 times produces more precise predictions.