The +2.0 m/s rule
World Athletics caps the legal tailwind at +2.0 m/s for sprints (100m, 200m, 100mH, 110mH) and horizontal jumps (long jump, triple jump). Marks beyond +2.0 count for the meet but not for records or qualifying.
Wind matters in sprints and horizontal jumps. A +4.0 m/s tailwind is worth roughly 0.10-0.15 seconds in the 100m; a -2.0 m/s headwind costs roughly the same. This calculator takes your time or distance plus the wind reading and returns a wind-corrected equivalent for fair comparison across meets.
World Athletics caps the legal tailwind at +2.0 m/s for sprints (100m, 200m, 100mH, 110mH) and horizontal jumps (long jump, triple jump). Marks beyond +2.0 count for the meet but not for records or qualifying.
Mureika (2001) and Linthorne (1994) modeled the effect of wind on sprint times and jump distances. 100m: about 0.05 seconds per 1.0 m/s of wind. 200m: about 0.03 seconds (because half the race is on the curve). Long jump: about 0.02 m per 1.0 m/s. These coefficients are widely used by ranking sites (Tilastopaja, AllAthletics) to compare wind-aided marks.
The relationship is approximately linear within the +/- 4 m/s range typical at outdoor meets. A -2.0 m/s headwind costs about 0.10 seconds in the 100m; a +2.0 m/s tailwind helps by the same amount.
The calculator gives you a starting number. AI form check verifies whether your form is actually matching that number on the runway. Upload a clip from practice, and the AI tells you whether your takeoff velocity, grip height, and approach are landing where the calculator said they should.
Frequently asked questions about how this calculator works and the methodology behind it.
Primary sources behind the numbers and methods on this page.
A directory of every sprints page on the site, from broad analysis tools to specific phase deep-dives. Each entry points to a focused write-up.
Run the numbers, then run the rep. AI form check tells you whether your form is matching the math, frame by frame.