Flying 30m converter
Turn your flying 30m time into top speed in km/h and mph, and see the 100m time that speed points to.
speed = 30 ÷ t · 100m = (10/3) × t + 1.00
How the conversion works
A flying 30m is timed after a running start, so it measures your top speed, not your acceleration. Speed is simply distance over time.
The 100m estimate assumes you hold that speed for the whole race and adds one second for the start, following Jimson Lee's table at SpeedEndurance.com:
- top speed = 30 ÷ t (m/s) · × 3.6 = km/h
- 100m ≈ (10/3) × t + 1.00
Flying 30m chart
| Fly 30 | km/h | mph | 100m |
|---|---|---|---|
| 2.60 | 41.5 | 25.8 | 9.67 |
| 2.80 | 38.6 | 24.0 | 10.33 |
| 3.00 | 36.0 | 22.4 | 11.00 |
| 3.20 | 33.8 | 21.0 | 11.67 |
| 3.40 | 31.8 | 19.7 | 12.33 |
| 3.60 | 30.0 | 18.6 | 13.00 |
Questions
How do you convert a flying 30m time to top speed?
Divide 30 by your time. A 3.00 s flying 30m is 10.00 m/s, which is 36.0 km/h or 22.4 mph. Multiply m/s by 3.6 for km/h.
How do you estimate a 100m time from a flying 30m?
Multiply the flying 30m time by 10/3 and add 1.00 s for the acceleration from the blocks: 100m ≈ (10/3) × fly 30 + 1.00. A 3.00 s fly gives about 11.00 s. The formula comes from Jimson Lee at SpeedEndurance.com.
How accurate is the 100m estimate?
It shows your potential based on top speed. Athletes who accelerate well can beat it by a few tenths, and athletes who fade late in the race run slower. The acceleration allowance ranges from about 0.7 s for elite starters to about 1.2 s for poor ones.
Can I use a flying 10m or 20m instead?
Yes. The converter turns a 10m or 20m fly into the 30m time at the same speed first. A 1.00 s flying 10m is 10 m/s, the same as a 3.00 s flying 30m. Shorter flys amplify small timing errors, so the 30m is the most reliable.
Is this the same formula the TrackSpeed app uses?
Yes. Top speed and the 100m estimate use the same equations as the flying sprint converter in the TrackSpeed iOS app, so both give the same answer.
Time your flying 30m with your phone.
TrackSpeed times flying sprints with two iPhones as timing gates and shows your top speed after every run.
