iOS app for track & field
Wind Correction
In athletics the wind decides more than we admit. Wind Correction tells you what your time or your jump would have been under any wind you choose — so two performances can finally be compared on the same terms.
Live
Try the algorithm
The same formulas that run inside the app, running here. Put in a mark and the wind it was set in, then pick the wind you want to compare it against. Zero is the honest default: it is what every performance would be worth on a still day.
Predicted time
—s
Enter a time to see it corrected.
Corrections are estimates: they model the aerodynamic effect of the wind, not the race. Track, shoes, altitude and the athlete's own day are still in there.
In the app
Get started
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Each event has its own coefficients, fitted separately: the sprints react to the wind through air resistance over the whole run, the jumps only through the run-up. Picking the wrong one is the easiest way to get a wrong answer.
Tap the logo at any time to reset every field.
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The real wind is what anchors the correction to what actually happened — without it the app has nothing to correct away. Use the sign the gauge gave you: a headwind is negative.
Times go in as seconds (10.95), jumps as metres (7.42). Anything beyond ±6 m/s is refused.
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Still air is the fair default — it is the only wind every performance can share. Drag the slider instead and the predicted mark moves as you go, which is the quickest way to feel how much a tailwind is really worth.
The same thing runs on this page, in Try the algorithm.
Where the numbers come from
The science
Wind Correction is built by Lorenzo Galli on the data-driven model of M. Moinat, O. Fabius and K. S. Emanuel, published in 2018 — a correction fitted on real competition results rather than on a wind-tunnel ideal.
European Journal of Sport Science, 2018 Data-driven quantification of the effect of wind on athletics performance doi.org/10.1080/17461391.2018.1480062 ↗- 5events modelled: 100m, 200m, 100/110m hurdles, long jump, triple jump
- ±6 m/sthe wind range the model is asked to work in
- non-lineara tailwind gives back less and less the stronger it blows
Good to know
FAQs
The model is peer-reviewed and fitted on real results, but the wind itself is never constant down a straight, and the gauge only samples part of it. Treat a correction as a fair estimate, not a new official time.
Air resistance grows with the square of the relative speed, so the relationship is curved and event-dependent. Going from +1 to +2 m/s helps less than going from 0 to +1 — the curve in the calculator above shows exactly that.
No. Official rules only say whether a mark is wind-legal (up to +2.0 m/s); they never rescale it. Wind Correction is for comparing, training and understanding — not for the result sheet.
Wind Correction is on iOS today, and an Android version is in the works. The calculator on this page works in any browser, on any device.
Take it to the track
Free on the App Store. No account, no data collected — just the wind and your mark.
We'd love to hear from you
Found something off, or want your event added? Write to us — messages from athletes and coaches shape what gets built next.