Sprint top speed calculator
Enter a distance and the time it took to get your average speed over that stretch in m/s, mph and km/h. If the time comes from a short flying segment, that average sits close to your top speed.
Which time to enter
A time from a standing start gives you an average that includes the slow first steps. A 4.50 s 40-yard dash works out to 18.2 mph, yet the same athlete covers the last 10 yards a good deal faster than that. For top speed, enter a flying segment: a 10 m or 10-yard zone that you enter at full speed after a build-up of 20 to 40 m.
Short zones get you closer to the true peak, and they punish timing error harder. On a 1.00 s flying 10 m, a 0.02 s error moves the answer from 10.0 to 10.2 m/s. Stretch the zone to 30 m and the same 0.02 s shifts the result by under 1%, but the average now includes some speed you gained or lost inside the zone. A flying 10 m gets closest to your peak, and a flying 30 m gives a steadier number to track week to week.
Flying 10 m
| Time (s) | m/s | mph | km/h |
|---|---|---|---|
| 0.85 | 11.76 | 26.3 | 42.4 |
| 0.90 | 11.11 | 24.9 | 40.0 |
| 0.95 | 10.53 | 23.5 | 37.9 |
| 1.00 | 10.00 | 22.4 | 36.0 |
| 1.05 | 9.52 | 21.3 | 34.3 |
| 1.10 | 9.09 | 20.3 | 32.7 |
| 1.20 | 8.33 | 18.6 | 30.0 |
| 1.30 | 7.69 | 17.2 | 27.7 |
| 1.40 | 7.14 | 16.0 | 25.7 |
Flying 10 yards
| Time (s) | m/s | mph | km/h |
|---|---|---|---|
| 0.85 | 10.76 | 24.1 | 38.7 |
| 0.90 | 10.16 | 22.7 | 36.6 |
| 0.95 | 9.63 | 21.5 | 34.7 |
| 1.00 | 9.14 | 20.5 | 32.9 |
| 1.05 | 8.71 | 19.5 | 31.4 |
| 1.10 | 8.31 | 18.6 | 29.9 |
| 1.20 | 7.62 | 17.0 | 27.4 |
| 1.30 | 7.03 | 15.7 | 25.3 |
Flying 30 m
| Time (s) | m/s | mph | km/h |
|---|---|---|---|
| 2.60 | 11.54 | 25.8 | 41.5 |
| 2.70 | 11.11 | 24.9 | 40.0 |
| 2.80 | 10.71 | 24.0 | 38.6 |
| 2.90 | 10.34 | 23.1 | 37.2 |
| 3.00 | 10.00 | 22.4 | 36.0 |
| 3.20 | 9.38 | 21.0 | 33.8 |
| 3.40 | 8.82 | 19.7 | 31.8 |
| 3.60 | 8.33 | 18.6 | 30.0 |
| 3.80 | 7.89 | 17.7 | 28.4 |
Speed = distance / time. 1 m/s = 2.237 mph = 3.6 km/h. 10 yards = 9.144 m.
Getting top speed without a zone
With gates, you have to guess where the athlete hits top speed and put the flying zone there. Sprintbrick measures your distance from a receiver behind the start 100 times a second, so the app plots speed for the whole rep and reports the peak. It also finds your fastest 10, 20 and 30 m anywhere in the run.