100m to 300m Conversion Calculator
Your 100m speed is a direct indicator of 300m potential. This predictor converts your sprint performance using models calibrated for ATP-PC demands, giving you a realistic 300m target based on speed maintenance and acceleration patterns.
Quick answer: a 12.00 s 100m converts to about 40.40 s for the 300m (typical range 38.92 s to 42.49 s).
100m to 300m conversion table
Estimates only – individual results vary with training, conditions and event experience.
| 100m time | Predicted 300m | Range |
|---|---|---|
| 10.40 | 33.81 | 32.57–35.56 |
| 10.60 | 34.65 | 33.38–36.44 |
| 10.80 | 35.48 | 34.18–37.31 |
| 11.00 | 36.31 | 34.98–38.18 |
| 11.20 | 37.13 | 35.77–39.05 |
| 11.40 | 37.95 | 36.56–39.92 |
| 11.60 | 38.77 | 37.35–40.78 |
| 11.80 | 39.59 | 38.14–41.64 |
| 12.00 | 40.40 | 38.92–42.49 |
| 12.20 | 41.21 | 39.70–43.35 |
| 12.40 | 42.02 | 40.48–44.20 |
| 12.60 | 42.83 | 41.26–45.05 |
| 12.80 | 43.63 | 42.04–45.89 |
| 13.00 | 44.44 | 42.81–46.74 |
| 13.20 | 45.24 | 43.58–47.58 |
| 13.40 | 46.03 | 44.35–48.42 |
| 13.60 | 46.83 | 45.12–49.25 |
| 13.80 | 47.63 | 45.88–50.09 |
| 14.00 | 48.42 | 46.64–50.92 |
| 14.20 | 49.21 | 47.41–51.76 |
| 14.40 | 50.00 | 48.17–52.58 |
| 14.60 | 50.78 | 48.92–53.41 |
| 14.80 | 51.57 | 49.68–54.24 |
| 15.00 | 52.35 | 50.44–55.06 |
How it works
The 100m to 300m conversion uses RacePotential's sprint model: an acceleration phase plus speed maintenance. A range is shown because individual speed endurance differs.
Training advice
Use a recent competition or time-trial 100m for best results. To improve your 300m, focus on lactate tolerance. Sprint predictions work best when both efforts are from the same training phase and surface type.
Frequently asked questions
How accurate is a 100m to 300m prediction?
The range shown covers typical athletes, but individual speed endurance differs. Accuracy is best with a recent all-out 100m time from the same season. Estimates have not yet been validated against real race data.
What training improves my 300m from a 100m base?
Focus on lactate tolerance. Your 100m provides a directly transferable fitness base. 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 100m 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.